WO2025257082A1

WO2025257082A1 - A control system for notifying a user via a lighting system of a premises

Info

Publication number: WO2025257082A1
Application number: PCT/EP2025/065920
Authority: WO
Inventors: Viktor DEINEGA; Roxana Paval; Berent Willem MEERBEEK
Original assignee: Signify Holding BV
Current assignee: Signify Holding BV
Priority date: 2024-06-10
Filing date: 2025-06-06
Publication date: 2025-12-18
Anticipated expiration: 2026-12-10

Abstract

A control system for notifying a user via a lighting system is disclosed. The lighting system is located at a premises and comprises the control system, a lighting device and a first sensor, wherein the control system is configured to control the lighting device based on sensor input from the first sensor. The control system comprises: one or more input interfaces, one or more output interfaces, a processor configured to: receive, via the one or more input interfaces, a presence signal from a second sensor located at an entrance of the premises, wherein the presence signal is indicative of that a first user is present at the entrance of the premises, control, via the one or more output interfaces, a first controllable device located in the premises to provide a first notification to a second user located in the premises to indicate that the first user is present at the entrance, receive, via the one or more input interfaces, a response signal from the first sensor, wherein the response signal is indicative of a user input provided by the second user to the first sensor as a response to the first notification, and control, via the one or more output interfaces, a second controllable device located at the entrance of the premises to provide a second notification to the first user to indicate that the second user has noticed the presence of the first user.

Description

A CONTROL SYSTEM FOR NOTIFYING A USER VIA A LIGHTING SYSTEM OF A

PREMISES

FIELD OF THE INVENTION

The invention relates to control system for notifying a user via a lighting system of a premises and to a lighting system comprising the control system. The invention further relates to a method of notifying a user via a lighting system of a premises and to a computer program product for executing the method.

BACKGROUND OF THE INVENTION

Many households have smart doorbells which are connected to a user device such as a smartphone, to a central (home) control system, a smart assistant, etc. Recent doorbell systems allow homeowners to manually activate pre-recorded voice messages via applications when a visitor is present at the door. These solutions primarily revolve around generic (pre-recorded) responses. If the homeowner wishes to respond to the presence of the visitor, this response is typically provided via a personal (mobile) device carried by the homeowner. This enables the homeowner to communicate with the visitor.

SUMMARY OF THE INVENTION

The inventors have realized that current doorbell systems lack the capability to tailor feedback to the visitor based on the homeowner's current location or activity within the house. For instance, if the homeowner is located at the other side of the premises, it may take a while before the homeowner is able to open the door. In another example, the homeowner may be performing a specific activity that prevents the homeowner from quickly moving to the door. Current solutions would require the homeowner to use a personal device (e.g. a smartphone) to communicate with the visitor at the door. Such a personal device may not always be present, or for certain activities it may be undesirable to use the personal device to communicate with a visitor. It is therefore an object to provide an alternative solution to inform a visitor that a person is present at the premises.

According to a first aspect, the object is achieved by a control system for notifying a user via a lighting system located at a premises, the lighting system comprising the control system, a lighting device and a first sensor, wherein the control system is configured to control the lighting device based on sensor input from the first sensor, wherein the control system comprises: one or more input interfaces, one or more output interfaces, a processor configured to: receive, via the one or more input interfaces, a presence signal from a second sensor located at an entrance of the premises, wherein the presence signal is indicative of that a first user is present at the entrance of the premises, control, via the one or more output interfaces, a first controllable device located in the premises to provide a first notification to a second user located in the premises to indicate that the first user is present at the entrance, receive, via the one or more input interfaces, a response signal from the first sensor, wherein the response signal is indicative of a user input provided by the second user to the first sensor as a response to the first notification, and control, via the one or more output interfaces, a second controllable device located at the entrance of the premises to provide a second notification to the first user to indicate that the second user has noticed the presence of the first user.

This control system provides a communication channel between the first user at the entrance and the second user inside the premises. The first notification can be provided through various means, such as lighting changes, audio signals, or other sensory alerts, which are provided by the first controllable device. The second user can then respond using the first sensor, which could be a light switch, a motion detector, an open/close sensor, an RF-based sensor or another type of sensor configured to control the lighting device. Upon receiving the response, the control system controls the second controllable device at the entrance to notify the first user. This enables informing the first user (e.g. a visitor) that a second user (e.g. a homeowner) is present at the premises and has received the first notification.

The processor may be configured to obtain position information indicative of the position of the second user within the premises. This allows the system to provide the first notification in a location that is most likely to be noticed by the second user, enhancing the effectiveness of the notification.

The position information may be indicative of the position of the second user relative to a plurality of first controllable devices, and the processor may be configured to select the first controllable device from the plurality of first controllable devices based on the position of the second user relative to the plurality of first controllable devices. The selected first controllable device may be a controllable device located within a proximity range (distance) of the second user and/or be a controllable device located closest to the second user. This targeted notification approach ensures that the first notification (alert) is delivered in an efficient manner, reducing the likelihood of missed notifications.

The position information may be indicative of the position of the second user relative to the entrance of the premises, and the processor may be configured to: estimate a travel time based on the position of the second user relative to the entrance of the premises, wherein the estimated travel time is a required time for the second user to move from the from the position to the entrance, generate the second notification based on the estimated travel time, wherein the second notification is indicative of the estimated travel time, and control the second controllable device to provide the second notification indicative of the estimated travel time. This provides the second user (e.g. a visitor) an idea of how long they might need to wait before the first user arrives at the entrance of the premises.

The user input provided by the second user may comprise an estimated travel time, wherein the estimated travel time is a required time for the second user to move from the position to the entrance, wherein the response signal comprises the estimated travel time provided. The processor may be configured to: generate the second notification such that it is indicative of the estimated travel time, and control the second controllable device to provide the second notification indicative of the estimated travel time. This allows the second user to communicate their own estimate to the first user, which could be based on their knowledge of their current activity or any delays they might be experiencing.

The lighting system may comprise a plurality of first sensors, and the position information may be indicative of the position of the second user relative to the plurality of first sensors. The processor may be configured to select the first sensor from the plurality of first sensors based on the position of the second user relative to the plurality of first sensors. The selected first sensor may be a sensor located within a proximity range (distance) of the second user and/or be a sensor located closest to the second user. This enables the second user to provide the response in the most effective way possible, considering the second user's location within the premises. The processor may be further configured to receive, via the one or more input interfaces, a configuration signal from a user interface device operated by the second user, wherein the configuration signal is indicative of a user-selected first sensor and/or a user- selected first controllable device, and the processor may be further configured to select the first sensor and/or the first controllable device based on the configuration signal. This allows the second user to select their preferred first sensor and/or first controllable device for receiving and responding to notifications. This customization enhances the user experience by allowing the second user to tailor the notifications to their preferences and habits.

The second controllable device may be a further lighting device of the lighting system, and the processor may be configured to control the further lighting device to provide the second notification to the first user. This leverages the lighting system to provide the notification to the first user, thereby reducing the number of dedicated notification devices.

The second sensor may be a doorbell, and the first controllable device may be a doorbell chime.

According to a second aspect, the object is achieved by a lighting system comprising the control system, the lighting device and the first sensor. The first sensor may be a presence sensor or a light switch.

The first controllable device may be the lighting device. This further leverages the lighting system to provide the notification to the second user, thereby reducing the number of dedicated notification devices.

According to a second aspect, the object is achieved by a method of notifying a user via a lighting system, wherein the lighting system is located at a premises, wherein the lighting system comprises a control system, a lighting device and a first sensor, wherein the control system is configured to control the lighting device based on sensor input from the first sensor, the method comprising: receiving a presence signal from a second sensor located at an entrance of the premises, wherein the presence signal is indicative of that a first user is present at the entrance of the premises, controlling a first controllable device located in the premises to provide a first notification to a second user located in the premises to indicate that the first user is present at the entrance, receiving a response signal from the first sensor, wherein the response signal is indicative of a user input provided by the second user to the first sensor as a response to the first notification, and controlling a second controllable device located at the entrance of the premises to provide a second notification to the first user to indicate that the second user has noticed the presence of the first user.

It should be understood that the lighting system, method and computer program product may have similar and/or identical embodiments and advantages as the above-mentioned control systems.

BRIEF DESCRIPTION OF THE DRAWINGS

The above, as well as additional objects, features and advantages of the disclosed systems, devices and methods will be better understood through the following illustrative and non-limiting detailed description of embodiments of devices and methods, with reference to the appended drawings, in which:

Fig. 1 shows schematically an example of a system for notifying a user via a lighting system;

Fig. 2 shows schematically system comprising multiple first sensors and first controllable devices for notifying a user; and

Fig. 3 shows schematically a method of notifying a user via a lighting system.

All the figures are schematic, not necessarily to scale, and generally only show parts which are necessary in order to elucidate the invention, wherein other parts may be omitted or merely suggested.

DETAILED DESCRIPTION

Fig. 1 shows a system 100 for notifying a user via a lighting system. The lighting system comprises a control system 102, one or more lighting devices and one or more first sensors 110. The control system 102 is configured to control the lighting device based on sensor input from the first sensor 110. The control system 102 further comprises one or more input interfaces 104, one or more output interfaces 108 and a processor 106 configured to: receive, via the one or more input interfaces 104, a presence signal from a second sensor 120 located at an entrance 132 of a premises 130. The presence signal is indicative of that a first user 124 (e.g. a visitor) is present at (standing at or approaching) the entrance 132 of the premises 130. The processor 106 is further configured to control, in response to the presence signal, via the one or more output interfaces 108, a first controllable device 112 located in the premises 130 to provide a first notification to a second user 114 (e.g. a homeowner) located in the premises 130 to indicate that the first user 124 is present at the entrance 132. The processor 106 is further configured to receive, via the one or more input interfaces 104, a response signal from the first sensor 110, wherein the response signal is indicative of a user input provided by the second user 114 to the first sensor 110 as a response to the first notification. The processor 106 is further configured to control, in response to the response signal, via the one or more output interfaces 108, a second controllable device 122 located at the entrance 132 of the premises 130 to provide a second notification to the first user 124 to indicate that the second user 114 has noticed the presence of the first user 124. This enables informing the first user 124 that a second user 114 is present at the premises 130 and has received the first notification.

The lighting system comprises the control system 102 for controlling one or more lighting devices. The control system 102 is configured to control the one or more lighting devices based on sensor input from the first sensor 110. The first sensor is a sensor configured to receive user input. The first sensor 110 may, for example, be a light switch comprising one or more (rotary) buttons configured to receive the user input, be a presence sensor (e.g. a PIR sensor or an RF sensor) configured to receive the user input, a microphone for receiving an audio (voice) user input, an open/close or contact sensor to receive input on user opening or closing doors, a camera for receiving an image of user input (gesture), etc. The control system 102 may be configured to communicate with the one or more lighting devices via a (wireless) network. The control system 102 may comprise a communication unit, for communicating lighting control commands to the one or more lighting devices. The processor 106 may be configured to transmit lighting control commands via the communication unit (e.g. via Zigbee, Bluetooth, Wi-Fi, 4G, Ethernet, etc.). The communication unit may be the one or more output interfaces 108, or the communication unit may be a separate communication unit (e.g. a transmitter). The lighting control commands may comprise control instructions for controlling one or more lighting devices according to a light setting (e.g. a lighting control value indicative of the color, brightness, saturation, beam size/angle, etc.). The one or more lighting devices may comprise respective receivers for receiving respective lighting control commands, and respective processing units for controlling the light output based on the lighting control commands.

The control system 102 may, for example, be comprised in a single device, or its components and functionality may be distributed across multiple devices. The control system 102 may, for example, be comprised in a central (home) control device such as a bridge, a hub, a smartphone, a virtual (home) assistant. Alternatively, the control system 102 may, for example, be comprised in a lighting device of the lighting system, in the first or second sensor, in the first or second controllable device, etc. Additionally or alternatively, components and functionality of the control system 102 may be comprised in and executed from the cloud. The location of the different components and functionalities may be dependent on the system architecture of the system 100. The processor 106 (e.g. (e.g. a microprocessor, circuitry, a microchip, etc.) may, for example, be a set of processors and the functionalities of the processors may be distributed across these processors. The one or more input interfaces 104 may be a receiver or transceiver configured to receive signals (such as the presence signal and the response signal) via a (wireless) network. Alternatively, the one or more input interfaces 104 may be an input to the processor 106 (e.g. when the control system is (at least partly) comprised in the first or second sensor). The one or more output interfaces 108 may be a receiver or transceiver configured to transmit signals (such as the control commands to the controllable devices and/or the lighting devices of the lighting system) via a (wireless) network. Alternatively, the one or more output interfaces 108 may be an output of the processor 106 (e.g. when the control system is (at least partly) comprised in the first or second controllable device). It should be understood that the system architecture provided in Fig. 1 is merely an example and that the skilled person is able to design alternatives without departing from the scope of the appended claims.

The processor 106 is configured to receive, via the one or more input interfaces, the presence signal from the second sensor 120 located at or approaching the entrance 132. The second sensor 120 may, for example, be a doorbell button or a presence sensor (e.g. a camera, a PIR sensor, etc.) configured to detect/determine the presence of the first user 124 at the entrance 132 (e.g. a door, a gate, a doorstep, a perimeter of the premises 130, etc.). The presence signal is indicative of that the first user 124 is present at the entrance 132 of the premises 130. The presence of the first user 124 may be detected automatically. For example, the second sensor 120 may be a camera or a presence sensor which may provide the presence signal when the first user 124 has been detected at the entrance 132 of the premises 130. Additionally or alternatively, the presence may be determined based on a manual user input provided by the first user 124. For example, the second sensor 120 may be a button of a doorbell which may provide the presence signal when the first user 124 has pressed the button. The presence signal may be received directly (e.g. via a (wireless) network) from the second sensor 120 or indirectly, for instance via the internet or via a central (home) control device such as a bridge, a hub, a smartphone, a virtual (home) assistant. The processor 106 is further configured to control the first controllable device 112 located in the premises to provide a first notification to the second user 114 located in the premises 130 to indicate that the first user 124 is present at the entrance 132. The processor 106 may, for example, send a control command to the controllable device 112 to provide the first notification to the second user 114. The first controllable device 112 may, for example, be a/the lighting device of the lighting system. In response to receiving the presence signal, the processor 106 may send a lighting control command to change the light output of the lighting device to indicate to the second user 114 that the first user 124 is present at the entrance 132 of the premises 130. In another example, the first controllable device 112 may be a doorbell chime, and the processor 106 may activate the doorbell chime in response to receiving the presence signal to provide a sound to notify the second user 114. In another example, the first controllable device 112 may be a virtual voice assistant, and the processor 106 may activate the virtual voice assistant in response to receiving the presence signal to provide a voice message to notify the second user 114. In another example, the first controllable device 112 may be a display device for controlling the lighting system, and the processor 106 may activate the display device in response to receiving the presence signal to provide a message on the display to notify the second user 114. It should be understood that these are mere examples of controllable devices, and that the skilled person is able to design alternatives without departing from the scope of the appended claims.

The processor 106 is further configured to receive a response signal from the first sensor 110, wherein the response signal is indicative of a user input provided by the second user 114 to the first sensor 110 as a response to the first notification. The response signal may be received from the first sensor 110 via the input interface 104, e.g. via a (wireless) network. The first sensor 110 thus provides two functions: it is used to control the lighting device and it is used to provide a response to the first notification. The processor 106 may be configured to refrain from controlling the lighting device for a predefined period of time required to respond to the notification (e.g. 5 seconds, 10 seconds or 30 seconds) after the first notification has been received, such that the lighting device is not controlled when the second user 114 provides the user input via the first sensor 110 to respond to the first notification.

The first sensor 110 may, for example, be a light switch comprising one or more (rotary) buttons configured to receive the user input. The light switch may be configured to control the lighting device when a user presses, rotates or slides buttons of the light switch. When the first user 124 is present at the entrance 132 of the premises, the processor 106 may receive the response signal indicative of a button activation in response to the first notification. The lighting control functionality for controlling the lighting may then be disabled for a predefined period of time.

In another example, the first sensor 110 may be a presence sensor (e.g. a PIR sensor, a camera or an RF sensor) configured to receive the user input. The presence sensor may be used for controlling the lighting device based on user presence, motion and/or activity. When the first user 124 is present at the entrance 132 of the premises, the processor 106 may receive the response signal indicative of presence of the second user 114 in response to the first notification. The presence sensor may be configured to detect a motion (movement) of the second user as the response. The motion (movement) may be a specific motion (e.g. a user moving through the space, a user waving, etc.) or for example a motion that deviates from a baseline motion pattern (e.g. a user may typically move according to a certain pattern, and the response may be a deviation from that pattern).

In another example, the first sensor 110 may be a microphone for receiving an audio (voice) user input. The microphone may be used for controlling the lighting device based on voice commands of the user. When the first user 124 is present at the entrance 132 of the premises, the processor 106 may receive the response signal indicative of a voice response to the controlling of the first controllable device 112. It should be understood that these types of first sensors are mere examples of first sensors 110, and that the skilled person is able to design alternatives without departing from the scope of the appended claims.

The processor 106 is further configured to control the second controllable device 122 located at the entrance 132 of the premises to provide a second notification to the first user 124 to indicate that the second user 114 has noticed the presence of the first user 124. The processor 106 may control the second controllable device 122 via the output interface 108, e.g. via a (wireless) network. The second controllable device 122 may, for example, be a lighting device comprised in the lighting system, a smart doorbell, a voice assistant, etc.

The processor 106 may be further configured to obtain position information indicative of a position of the second user 114 within the premises 130. The position information may, for example, be obtained (e.g. via the input interface 104) from an (indoor) positioning system, such as an RF-sensing positioning system or a coded light-based positioning system, from a camera system, from a presence sensor system, etc. Methods for obtaining information about a position of users with respect to an environment are known in the art and will therefore not be discussed in further detail. The position information may be indicative of the position of the second user relative to a plurality of first controllable devices. This is illustrated in Fig. 2, wherein the system comprises a first controllable device 112 and a second controllable device 212. In this example, the first controllable device 112 is located in a first room of the premises 130 and the second controllable device 212 is located in a second room of the premises 130. The locations of the plurality of first controllable devices with respect to the premises 130 (and with respect to the user) may, for example, be obtained (e.g. via the input interface 104) from an (indoor) positioning system, such as an RF-sensing positioning system or a coded lightbased positioning system, etc. Alternatively, the locations of the plurality of first controllable devices with respect to the premises 130 may be obtained from the lighting system, from a sensing system, from a building information model, user input on a floor plan via a GUI, etc. Techniques for obtaining locations of devices in an environment are known in the art and will therefore not be discussed in further detail. The processor 106 may be further configured to select the first controllable device 112 from the plurality of first controllable devices 112, 212 based on the position of the second user 114 relative to the plurality of first controllable devices 112, 212. In the example of Fig. 2, the processor 106 may select controllable device 112 as the first controllable device 112 to provide the first notification based on that the user is located in the same area (e.g. room) as that first controllable device.

The position information may be indicative of the position of the second user 114 relative to the entrance 132 of the premises 130 (e.g. a distance). The processor 106 may be configured to estimate a travel time based on the position of the second user 114 relative to the entrance 132 of the premises 130, wherein the estimated travel time is a required time for the second user 114 to move from the from the position to the entrance 132. The processor 106 may, for example, determine the estimated travel time based on the distance between the second user 114 and the entrance 132. Additionally or alternatively, the processor 106 may determine the estimated travel time based on historical (measured) travel times from certain positions in the premises 130 to the entrance 132. The processor 106 may be further configured to generate the second notification based on the estimated travel time, wherein the second notification is indicative of the estimated travel time, and control the second controllable device 112 to provide the second notification indicative of the estimated travel time. This may, for example, be 5 seconds, 10 seconds, or 30 seconds in dependence of the location of the second user 112 with respect to the entrance 132.

Alternatively, the user input provided by the second user may comprise the estimated travel time, and the response signal may comprise the estimated travel time. The sensor may, for example, be a microphone and the second user 114 may provide a voice input indicative of the estimated travel time. The processor 106 may be configured to generate the second notification such that it is indicative of the estimated travel time, and control the second controllable device to provide the second notification indicative of the estimated travel time. The processor 106 may, for example, control the second controllable device 122 located at the entrance 132 of the premises 130 to render the voice input, or it may provide the estimated travel time differently, for instance via a voice assistant or by rendering the estimated travel time on a display located at the entrance 132 of the premises 130.

The lighting system may comprise a plurality of first sensors, and the position information may be indicative of the position of the second user 114 relative to the plurality of first sensors. This is illustrated in Fig. 2, wherein the system comprises a first sensor 110 and a second sensor 210. The locations of the plurality of sensors 110, 120 with respect to the premises 130 (and with respect to the user) may, for example, be obtained (e.g. via the input interface 104) from an (indoor) positioning system, such as an RF-sensing positioning system or a coded light-based positioning system, etc. Alternatively, the locations of the plurality of first controllable devices with respect to the premises 130 may be obtained from the lighting system, from a sensing system, from a building information model, etc. Techniques for obtaining locations of devices in an environment are known in the art and will therefore not be discussed in further detail. The processor 106 may be further configured to select the first sensor from the plurality of first sensors based on the position of the second user relative to the plurality of first sensors. In the example of Fig. 2, the processor 106 may select sensor 110 over sensor 210 because sensor 110 is located closer to the second user 114. The processor 106 may then configure the control system such that when a user input is received at first sensor 110, that user input is considered the response to the first notification. The processor 106 may further configure the control system such that when a (user) input is received at the other first sensor 210, that (user) input it is still used for controlling one or more lighting devices of the lighting system.

The processor 106 may be further configured to receive, via the one or more input interfaces 104, a configuration signal from a user interface device (e.g. a mobile device, a central (home) control system, a voice assistant, etc.) operated by the second user 120. The configuration signal may be indicative of a user-selected first sensor 110 and/or a user- selected first controllable device 112, and the processor 106 may be configured to select the first sensor and/or the first controllable device based on the configuration signal. The first and/or second controllable devices 110, 122 may be lighting devices of the lighting system. The processor 106 may be configured to control a first lighting device located inside the premises 130 to provide the first notification and/or to control a second lighting device located at the entrance of the premises to provide the second notification. The processor 106 may, for example, configured to change the light output of the first and/or second lighting devices (e.g. by changing the color, blinking, etc.).

Fig. 3 shows schematically a method 300 of notifying a user via a lighting system, wherein the lighting system is located at a premises, wherein the lighting system comprises a control system, a lighting device and a first sensor, wherein the control system is configured to control the lighting device based on sensor input from the first sensor. The method 300 comprising: receiving 302 a presence signal from a second sensor located at an entrance of the premises, wherein the presence signal is indicative of that a first user is present at the entrance of the premises, controlling 304 a first controllable device located in the premises to provide a first notification to a second user located in the premises to indicate that the first user is present at the entrance, receiving 306 a response signal from the first sensor, wherein the response signal is indicative of a user input provided by the second user to the first sensor as a response to the first notification, and controlling 308 a second controllable device located at the entrance of the premises to provide a second notification to the first user to indicate that the second user has noticed the presence of the first user.

The method 300 may be executed by computer program code of a computer program product when the computer program product is run on a processing unit of a computing device, such as the processor 106 of the control system 102.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer or processing unit. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Aspects of the invention may be implemented in a computer program product, which may be a collection of computer program instructions stored on a computer readable storage device which may be executed by a computer. The instructions of the present invention may be in any interpretable or executable code mechanism, including but not limited to scripts, interpretable programs, dynamic link libraries (DLLs) or Java classes. The instructions can be provided as complete executable programs, partial executable programs, as modifications to existing programs (e.g. updates) or extensions for existing programs (e.g. plugins). Moreover, parts of the processing of the present invention may be distributed over multiple computers or processors or even the ‘cloud’.

Storage media suitable for storing computer program instructions include all forms of nonvolatile memory, including but not limited to EPROM, EEPROM and flash memory devices, magnetic disks such as the internal and external hard disk drives, removable disks and CD-ROM disks. The computer program product may be distributed on such a storage medium, or may be offered for download through HTTP, FTP, email or through a server connected to a network such as the Internet.

Claims

CLAIMS:

1. A control system (102) for notifying a user (114) via a lighting system, wherein the lighting system is located at a premises (130), wherein the lighting system comprises the control system (102), a lighting device and a first sensor (110), wherein the control system (102) is configured to control the lighting device based on sensor input from the first sensor (110), wherein the control system comprises: one or more input interfaces (104), one or more output interfaces (108), and a processor (106) configured to: receive, via the one or more input interfaces (104), a presence signal from a second sensor (120) located at an entrance (132) of the premises (130), wherein the presence signal is indicative of that a first user (124) is present at the entrance (132) of the premises (130), obtain position information indicative of a position of a second user relative to a plurality of first controllable devices within the premises, select a first controllable device from the plurality of first controllable devices based on the position of the second user relative to the plurality of first controllable devices, control, via the one or more output interfaces (108), the first controllable device (112) located in the premises (130) to provide a first notification to the second user (124) located in the premises (130) to indicate that the first user (124) is present at the entrance (132), receive, via the one or more input interfaces (104), a response signal from the first sensor (110), wherein the response signal is indicative of a user input provided by the second user (114) to the first sensor (110) as a response to the first notification, and control, via the one or more output interfaces (118), a second controllable device (112) located at the entrance (132) of the premises (130) to provide a second notification to the first user (124) to indicate that the second user (114) has noticed the presence of the first user (124).

2. The control system of claim 1, wherein the position information is indicative of the position of the second user relative to the entrance of the premises, and wherein the processor is configured to: estimate a travel time based on the position of the second user relative to the entrance of the premises, wherein the estimated travel time is a required time for the second user to move from the from the position to the entrance, generate the second notification based on the estimated travel time, wherein the second notification is indicative of the estimated travel time, and control the second controllable device to provide the second notification indicative of the estimated travel time.

3. The control system of claim 1 or 2, wherein the lighting system comprises a plurality of first sensors, and wherein the position information is indicative of the position of the second user relative to the plurality of first sensors, and wherein the processor is configured to select the first sensor from the plurality of first sensors based on the position of the second user relative to the plurality of first sensors.

4. The control system of claim 1, wherein the user input provided by the second user comprises an estimated travel time, wherein the estimated travel time is a required time for the second user to move from the position to the entrance, wherein the response signal comprises the estimated travel time provided, and wherein the processor is configured to: generate the second notification such that it is indicative of the estimated travel time, and control the second controllable device to provide the second notification indicative of the estimated travel time.

5. The control system of any preceding claim, wherein the processor is further configured to receive, via the one or more input interfaces, a configuration signal from a user interface device operated by the second user, wherein the configuration signal is indicative of a user-selected first sensor and/or a user-selected first controllable device, and wherein the processor is configured to select the first sensor and/or the first controllable device based on the configuration signal.

6. The control system of any preceding claim, wherein the second controllable device is a further lighting device of the lighting system, and wherein the processor is configured to control the further lighting device to provide the second notification to the first user.

7. The control system of any preceding claim, wherein the second sensor is a doorbell, and wherein the first controllable device is a doorbell chime.

8. A lighting system comprising the control system, the lighting device and the first sensor of any of the preceding claims.

9. The lighting system of claim 8, wherein the first sensor is a presence sensor or a light switch.

10. The lighting system of claim 9, wherein the first controllable device is the lighting device.

11. A method (300) of notifying a user via a lighting system, wherein the lighting system is located at a premises, wherein the lighting system comprises a control system, a lighting device and a first sensor, wherein the control system is configured to control the lighting device based on sensor input from the first sensor, the method (300) comprising: receiving (302) a presence signal from a second sensor located at an entrance of the premises, wherein the presence signal is indicative of that a first user is present at the entrance of the premises, obtain position information indicative of a position of a second user relative to a plurality of first controllable devices within the premises, select a first controllable device from the plurality of first controllable devices based on the position of the second user relative to the plurality of first controllable devices, controlling (304) the first controllable device located in the premises to provide a first notification to the second user located in the premises to indicate that the first user is present at the entrance, receiving (306) a response signal from the first sensor, wherein the response signal is indicative of a user input provided by the second user to the first sensor as a response to the first notification, and controlling (308) a second controllable device located at the entrance of the premises to provide a second notification to the first user to indicate that the second user has noticed the presence of the first user.

12. A computer program product for a computing device, the computer program product comprising computer program code to perform the method (300) of claim 11 when the computer program product is run on a processing unit of the computing device.