CN110784536A - Wireless light control method based on ZigBee - Google Patents

Abstract

A ZigBee-based wireless lighting control method disclosed by the invention uses the ZigBee radio frequency communication protocol, serial port assistant and server (PC) to realize that the serial port assistant is used as the manual control terminal, and the sensor on the control system platform is used as the automatic control terminal. , using ZigBee wireless network as the transmission medium and CC2530 as the control center. The serial assistant is connected with the coordinator in the ZigBee network through the serial port. The serial assistant receives the user operation information, and sends the data to the coordinator through the serial port. After the coordinator receives the data, it sends the data to the control system platform by wireless transmission. And control the light circuit according to the data; or collect environmental information through the sensors on the control system platform, and send the data to the coordinator through wireless transmission. After the coordinator receives the data, it sends the data to the control system platform through wireless transmission. And control the light circuit according to the data.

Description

A wireless lighting control method based on ZigBee

technical field

The invention belongs to the technical field of artificial intelligence, and relates to a ZigBee-based wireless lighting control method.

Background technique

The development of the Internet of Things technology has brought human beings into a "smart" life, especially the application of the Internet of Things in the home has become the commanding heights of the Internet of Things enterprises in various countries. At present, most of the commonly used lighting controls are traditional manual mechanical switches, infrared remote control switches and acousto-optic switches, but now people's requirements for lighting products are not only limited to lighting, but more convenient operation, various control methods and Strong visual experience. Obviously, the traditional lighting control has many shortcomings such as complicated wiring, low safety, waste of resources, etc., and can no longer meet the needs of modern control. The intelligent lighting system combines traditional lighting, ZigBee wireless technology, sensor application technology, and advanced manufacturing technology to realize intelligent remote control, which greatly meets people's needs for lighting and saves resources.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a wireless lighting control method based on ZigBee, which realizes remote manual control of the working state of lighting based on ZigBee wireless technology, and realizes automatic control of the working state of lights by detecting the human body and light intensity; to reduce cables The laying area and the complexity of the wiring are reduced, and the switch accident caused by infrared emission is avoided.

The technical solution adopted in the present invention is a ZigBee-based wireless lighting control method, which specifically includes the following steps:

Step 1, ZigBee networking;

The networking process of ZigBee mainly includes: coordinator hardware construction, network device initialization, and establishment of a new network; the coordinator is the first device in the network, the establishment and initialization of the network, the determination of the individual domain identifier and physical channel of the network, and the Other nodes are assigned unique network short addresses.

Step 2, the hardware design of the control system platform;

The main control chip CC2530 is used in the control system platform to be responsible for the control system platform or routing node data collection, preprocessing, sending and receiving related commands; control the node's related output devices, human infrared sensors, photosensitive sensors, relays, lighting and wireless. signal receiver;

Step 3, using the structures obtained in steps 1 and 2 to control lighting.

The present invention is also characterized in that,

In step 1, the coordinator uses the CC2530 chip as the main chip. The coordinator also includes a JTAG interface, a power module, a serial interface, an LED module and a button module. The USB interface is used for power supply. The button module controls whether the coordinator allows a new network to join. When adding a new device to the established ZigBee network, it is necessary to enable the network permission to assign a network address to the newly added device.

In step 1, after the coordinator enters the wireless monitoring state, when a new device is added, the network will assign a 16-bit network address, which is unique in the network and is used for device identification and data transmission.

The parent device address in the 16-bit network address in step 1 is assigned as follows:

Assuming that the maximum number of devices that the parent device can have is C _m , the maximum number of routing sub-devices that C _m has is R _m , and the maximum network depth is L _m , the number of sub-segment addresses that the parent device can allocate is:

If R _m =1, C _skip =1+C _m *(L _m -d-1);

If R _m is not 1, then C _skip =(1+C _m -R _m -C _m *R _m ^(L _m -d-1))/(1-R _m );

The child node assigns the short address of the nth child router of the parent device:

A _child =A _parent +(n-1)*C _skip +1, n=1

A _child =A _parent +(n-1)*C _skip , n>1

The child node is the short address assignment of the nth child control system platform of the parent device:

A _child =A _parent +R _m *C _skip +n.

The wireless lighting control process in step 3 includes manual control and automatic control;

In the manual control mode, the user enters an instruction in the serial port assistant of the PC, and the instruction is transmitted to the coordinator by serial communication. The coordinator converts the information into a wireless signal and transmits it to the wireless signal transceiver. The CC2530 main control board obtains information to control the light switch;

In the automatic control mode, the photosensitive sensor and the human body sensor detect the surrounding environment information. When there is no light, the lighting needs to be turned on. In other cases, the lighting should be off; the information collected on site will be transmitted to the CC2530 main unit. The control board is then transmitted to the coordinator by wireless signal through the wireless signal transceiver. The coordinator will transmit the information to the serial assistant through serial communication to display the on-site situation to the user, and at the same time transmit the control command to the control system through the wireless signal transceiver. The platform uses a relay to control the switch of the lighting.

In step 2, the human body infrared sensor is HC-SR501.

In step 2, the wireless signal receiver is EM250.

The beneficial effects of the present invention are as follows:

1. No rewiring is required when adding new equipment;

2. Each lamp has a unique network address in the ZigBee network to ensure that a specific data packet can be sent to its designated device without confusion;

3. The remote control design reduces the laying area of cables and the complexity of wiring, reduces the waste of resources, and plays a certain role in electricity safety protection;

4. Simple operation, easy to use, and can check the working situation;

5. Automatically adjust the working state according to people and light.

Description of drawings

Fig. 1 (a), (b) are the structure schematic diagrams of manual and automatic control states in a ZigBee-based wireless lighting control method of the present invention;

2 is a schematic structural diagram of a coordinator in a ZigBee-based wireless lighting control method of the present invention;

3 is a schematic diagram of a control system adopted by a ZigBee-based wireless lighting control method of the present invention.

In the figure, 1. Photosensitive sensor, 2. Human body infrared sensor, 3. Lighting lamp, 4. Wireless signal transceiver, 5. CC2530 main control board, 6. Relay, 7. Control system platform.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A ZigBee-based wireless lighting control method of the present invention, as shown in Figure 1, includes two control methods: Figure 1(a) is the remote manual control of the working state of the electrical appliance, and Figure 1(b) is the electrical appliance's automatic control of the working state of the electrical appliance. . Specifically includes the following steps:

Step 1, ZigBee networking;

ZigBee technology is the key technology to realize wireless data transmission, which mainly includes: coordinator hardware construction, network initialization, and nodes joining the network. The coordinator is the first device in the network. It establishes and initializes the network, determines the individual domain identifier and physical channel of the network, and assigns network short addresses to other nodes. The coordinator is the first node in the ZigBee network, forming a complete network waiting for devices to join and assigning a 16-bit unique network address to it, ensuring that a specific data packet can be sent to its designated device without confusion.

Step 1.1, Hardware Design of Coordinator

In the coordinator hardware design scheme shown in Figure 2, the CC2530 chip is selected as the design main chip, which includes the JTAG interface, the power module, the serial interface, the LED module and the button module. The USB interface is used for power supply, and the button module controls whether the coordinator allows a new network to join. If a new device needs to be added to the established ZigBee network, the network permission must be turned on to assign a network address to the newly added device.

Step 1.2, network device initialization

Check whether the composed network device is a full-featured node, check that the node is not connected to other networks, and can only be used as a child node if it is connected to other networks.

Step 1.3, establish a new network;

Perform a channel scan while ensuring that there is only one coordinator in the network to find the best channel that has the fewest zigbee networks, preferably no zigbee devices. After finding a suitable channel, the coordinator will select a network identifier (PAN ID, value <=0x3FFF) for the network.

Step 1.4, the coordinator enters the wireless monitoring state, waiting for a node to join

When a device joins, the network assigns a 16-bit network address, which is unique in the network and is used both for device identification and for sending data; applications with important device addresses may need to know its device address and parent address, and use distributed addressing to assign addresses. The parent device address assignment is as follows:

Assuming that the maximum number of devices that the parent device can have is C _m , the maximum number of routing sub-devices it has is R _m , and the maximum depth of the network is L _m , then the number of sub-segment addresses C _skip that the parent device can allocate is:

If R _m =1, C _skip =1+C _m *(L _m -d-1);

If R _m is not 1, then C _skip =(1+C _m -R _m -C _m *R _m ^(L _m -d-1))/(1-R _m );

The child node address is the short address allocation of the nth child router of the parent device (use A _child to represent the child node address, and A _parent to represent the parent node address):

A _child =A _parent +(n-1)*C _skip +1, n=1

A _child =A _parent +(n-1)*C _skip , n>1

The child node is the short address assignment of the nth child control system platform of the parent device:

A _child =A _parent +R _m *C _skip +n

The human body sensor and the light sensitive sensor will detect the surrounding environment, whether there is someone and whether the light intensity is lower than the set threshold. Only when there is someone but the light intensity does not reach the threshold, the light will be turned on, and the information detected by the human body sensor and the light sensitive sensor will be Display the function of automatic control in the serial port assistant and by controlling the relay work after processing.

Step 2, control system platform 7 hardware design;

The main control chip CC2530 is responsible for the control system platform or routing node data collection, preprocessing, sending and receiving related commands, controlling the relevant output devices of this node, human infrared sensor HC-SR501, photosensitive sensors, relays, lights and wireless signal receivers . The I/O pins of CC2530 are assigned as follows: P0.1 is connected to the human body infrared sensor, P0.2 is connected to the photosensitive sensor, and P1.0 is connected to the relay. P0.1 is connected to the human infrared sensor to detect whether there is a person in the monitoring environment, P0.2 is connected to the photosensitive sensor to detect whether there is light in the environment, and P1.0 is connected to the relay to control the on and off of the bulb.

The software design process of the control system platform is as follows:

It is mainly the software setting of information transfer between the serial port and the coordinator. In the manual setting, set the corresponding command and command, for example, "D10", "D11" respectively turn on and off the light bulb of the control system platform 1, command "D20", "D11" "D21" lights and extinguishes the bulbs of the control system platform 2 respectively, and commands "D00" and "D01" to control the on and off of the two bulbs at the same time, respectively. In the automatic control link, the serial port assistant will display the current environment information, where midnight represents no light, light represents light, security represents no one, and insecurity represents someone.

Step 3, the wireless control of lighting is realized; the human infrared sensor detects whether there is a pedestrian, the light intensity of the environment detected by the photosensitive sensor is compared with the set threshold and divided into two situations: light and no light, and the relay controls the on and off of the lighting.

Whether the lamp is controlled manually or automatically, the final controlled object is the lamp, so in the present invention, the two methods are combined into one device. The control system platform is shown in Figure 1(a). In the manual control system, the user enters an instruction in the serial port assistant of the PC, and the instruction is transmitted to the coordinator by serial communication, and the coordinator converts the information into wireless signals It is transmitted to the wireless signal transceiver 4 (see FIG. 3 ), and the CC2530 main control board 5 controls the switch of the lighting lamp 3 according to the obtained information.

Referring to Figure 1(b) (the PIR sensor in Figure 1(b) is a human body infrared sensor), in the automatic control system, the photosensitive sensor 1 and the human body sensor 2 detect the surrounding environment information, and need to be turned on when there is no light. Lighting lamp 3, in other cases, the lighting lamp 3 should be off; the information collected on site will be transmitted to the CC2530 main control board 5, and then transmitted to the coordinator by wireless signal through the wireless signal transceiver 4, and the coordinator will The information is transmitted to the serial assistant through serial communication to display the on-site situation to the user, and at the same time, the control command is transmitted to the control system platform 7 through the wireless signal transceiver 4, and the switch of the lighting lamp 3 is controlled by the relay 6.

Step 3.1, connect the serial port to the PC on the CC2530 main control board 5;

Step 3.2, open the serial port assistant on the PC, set the parameters (baud rate 115200bps), select the corresponding COM port (serial port), and then send data to the other party through the serial port debugging tool;

Step 3.3, for the manual mode, you need to enter the corresponding command on the serial port assistant, and transmit the data to the external coordinator through the serial port; for the automatic mode, the human body sensor 1 and the light sensor 2 will detect the surrounding environment, whether there is anyone and whether the light intensity is lower than The system sets a threshold, and the light is turned on only when there is someone but the light intensity does not reach the threshold. The information detected by the sensor will be displayed in the serial assistant and the data will be passed to the coordinator.

Step 3.4, the coordinator first judges whether it has received the serial port command, if it does receive the serial port command, then parses the serial port command: reads the first to third byte "destination address" segment in the serial port command, and converts it into a serial port command that can be used for ZigBee 16-bit (two bytes) short address for wireless communication;

Then the coordinator sends the command again in the form of radio, and the sent content no longer includes the "frame header", "frame end" and "destination address" in the serial port command, only the core part - the command; if If the serial port command is not received, it will directly enter the receiving node command feedback process;

Step 3.5, the control system platform controls the switch of the lighting lamp 3 according to the command received by the wireless signal transceiver 4 according to the wireless signal; for the manual control system, input "D1" in the serial port debugging assistant, the system enters the manual control, input the command " D10" and "D11" respectively light up and extinguish the light bulb of the control system platform 1, command "D20" and "D21" to light up and extinguish the light bulb of the control system platform 2 respectively, and command "D00" and "D01" to control the two light bulbs simultaneously. Turn on and off a light bulb; input the command "D0" and the system will enter automatic control (these specific commands can be set during serial port software design);

For the automatic control system, the PIR sensor and the photosensitive sensor will transmit the received information to the coordinator, and the coordinator will transmit the information to the serial assistant through serial communication. Four states can be seen in the serial debugging interface: someone has no light, someone has Light, no one without light, no one with light. The light needs to be turned on only in the first case, and the light should be turned off in other cases, and the relay controls the light switch according to the on-site information fed back by the coordinator.

The main control chip of the coordinator is CC2530, the ZigBee network adopts the Z-Stack protocol stack, and uses the distributed addressing scheme to allocate network addresses.

The serial port debugging assistant in the control system platform is SSCOM3.2, the human body infrared sensor 1 is HC-SR501, and the wireless signal receiver 4 is EM250.

Claims (7)

1. A wireless light control method based on ZigBee is characterized by comprising the following steps:

step 1, ZigBee networking;

the networking process of ZigBee mainly comprises the following steps: establishing hardware of a coordinator, initializing network equipment and establishing a new network; the coordinator is the first device in the network, and the establishment, initialization, determination of the network domain identifier and physical channel, and assignment of a unique network short address to other nodes.

Step 2, controlling the design of system platform hardware;

a main control chip CC2530 is adopted in the control system platform to take charge of collecting, preprocessing, sending and receiving related commands of the control system platform or routing node data; controlling the node related output equipment, the human body infrared sensor, the photosensitive sensor, the relay, the illuminating lamp and the wireless signal receiver;

and 3, controlling the light by using the structures obtained in the steps 1 and 2.

2. The ZigBee-based wireless light control method as claimed in claim 1, wherein the coordinator in step 1 adopts a CC2530 chip as a main chip, the coordinator further comprises a JTAG interface, a power module, a serial interface, an LED module and a key module, power is supplied through a USB interface, the key module controls whether the coordinator allows a new network to be added, and when new equipment needs to be added into the established ZigBee network, the network is required to be opened to allow the newly added equipment to be allocated with a network address.

3. The ZigBee-based wireless light control method of claim 1, wherein after the coordinator enters the wireless monitoring state in the step 1, when a new device is added, the network allocates a 16-bit network address, which is unique in the network and used for device authentication and data transmission.

4. A ZigBee-based wireless light control method according to claim 3, wherein the parent device address in the 16-bit network address in step 1 is assigned as follows:

suppose that the maximum number of devices that a parent device can possess is C _m，C _mThe maximum number of owned routing sub-devices is R _mThe maximum depth of the network is L _mIf the number of the sub-segment addresses that can be allocated by the parent device is:

if R is _m＝1，C _skip＝1+C _m*(L _m-d-1)；

If R is _mNot 1, then C _skip＝(1+C _m-R _m-C _m*R _m^(L _m-d-1))/(1-R _m) (ii) a The child node allocates a short address of the nth child router of the parent device:

A _child＝A _parent+(n-1)*C _skip+1，n＝1

A _child＝A _parent+(n-1)*C _skip，n>1

the child node allocates a short address of the nth child control system platform of the parent device:

A _child＝A _parent+R _m*C _skip+n。

5. the ZigBee-based wireless light control method according to claim 2, wherein the wireless light control process in the step 3 comprises two modes of manual control and automatic control;

in a manual control mode, a user inputs an instruction in a serial port assistant of a PC (personal computer), the instruction is transmitted to a coordinator in a serial port communication mode, the coordinator converts information into a wireless signal and transmits the wireless signal to a wireless signal transceiver, and a CC2530 main control panel controls the on and off of an illuminating lamp according to the obtained information;

in an automatic control mode, a photosensitive sensor and a human body sensor detect surrounding environment information, when a person has no light, an illuminating lamp needs to be turned on, and under the other conditions, the illuminating lamp is in a state of being turned off; the information acquired on site can be transmitted to the CC2530 main control board, then transmitted to the coordinator in a wireless signal mode through the wireless signal transceiver, the coordinator can transmit the information to the serial assistant through serial port communication to display the site condition to a user, meanwhile, a control command is transmitted to the control system platform through the wireless signal transceiver, and the relay is used for controlling the on-off of the illuminating lamp.

6. The ZigBee-based wireless light control method of claim 2, wherein the human body infrared sensor in the step 2 is HC-SR 501.

7. The ZigBee-based wireless light control method of claim 2, wherein the wireless signal receiver in the step 2 is EM 250.

Images