AU5014099A

AU5014099A - Electronic control system with radio remote control setting of limit stops for motors for the operation of winding devices, such as roller shades, roller shutters, rolling gates and similar

Info

Publication number: AU5014099A
Application number: AU50140/99A
Authority: AU
Inventors: Marco Omenigrandi
Original assignee: Jolly Motor Int SpA
Current assignee: JOLLY MOTOR INTERNATIONAL SpA
Priority date: 1999-09-24
Filing date: 1999-09-24
Publication date: 2001-03-29
Anticipated expiration: 2019-09-24
Also published as: AU774466B2

Description

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AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant(s): DELTRON LTD.

Invention Title: ELECTRONIC CONTROL SYSTEM WITH RADIO REMOTE CONTROL SETTING OF LIMIT STOPS FOR MOTORS FOR THE OPERATION OF WINDING DEVICES, SUCH AS ROLLER SHADES, ROLLER SHUTTERS, ROLLING GATES AND

SIMILAR

The following statement is a full description of this invention, including the best method of performing it known to me/us: _1_ "Electronic control system with radio remote control setting of limit stops for motors for the operation of winding devices, such as roller shades, roller shutters, rolling gates and similar".

DESCRIPTION

The present invention refers to an electronic control system for motors for the operation of winding devices, such as roller shades, roller shutters, rolling gates and similar, comprising a radio receiver controlled by a radio •transmitter.

In the last few years the custom to use electric controls for the opening and closing movements of roller shutters has been increasingly spreading, especially with the metallic ones, more resistant to force opening but also much heavier-than the wooden or plastic ones.

A reversible tubular electric ratiomotor having proper power and speed is therefore applied inside the rotating drum onto which the shutter is winding and a pair of push-button power switches is provided to allow the "user to control from the ground the operation of the ratiomotor in one sense or in the other for the corresponding movement of the roller shutter opening or closing.

The end of the opening or closing movement was originally determined by the simple release of the button being pressed, but has subsequently been made automatic by the employment of suitable limit stops associated with the winding drum.

Afterwards there has been a shift to the electronic control of the movement, that is obtained by inserting in the tubular motor an encoder that generates impulses at each prefixed angle of rotation of the drum and also by providing a push-button control panel provided with memory, that by gathering and counting the impulses transmitted by the encoder, allows to memorise desirable limit stop positions at first and then to control in a repetitive way the opening and closing movements of the roller shutter up to the aforementioned limit stop positions.

Possible positioning errors at the end of the opening or closing movement, due to the inevitable inertia of the shutter at the end of the movement and to the possibility of a settling re-descent, can be automatically compensated by electronic control systems for roller shutters, as described for example in EP-A-0671676.

These electronic remote control systems that provide for a radio receiver "associated with each winder operating motor and preferably included therein •.and a portable radio transmitter available to the user on the ground are 10 particularly appreciated.

In such a case, each radio transmitter must have its own identification 0o code that is stored in and can therefore be recognised by the purposely enabled receiver only so as to grant a high safety level to the winding ~system.

An example of remote control system for transmitting and receiving codified signals that allows the desired dialog univocality between the oo transmitter and the receiver and, by storing the identification code in the receiver by self-learning, avoids any necessity to physically accede to the receiver, is described in the Italian patent application n. VE97A00021, filed on 06/06/1997 in the name of TELECO AUTOMATION s.r.l..

The usefulness of this system is however limited to enable the transmitters to the control of the respective receivers, while no solution is provided for the setting of the limit stops, which has to be carried out manually, by uncomfortable access to the receiver associated with the winder drum.

In view of the described state of the art, a first object of the present invention is to provide an electronic control system for roller shutters and roller shades, comprising a radio receiver and a radio transmitter, that would allow the remote controlled setting of the limit stops position.

A second object of the present invention is to provide an electronic -3control system for a plurality of winding devices, each provided with a radio receiver, in which a single radio transmitter is enabled to operate simultaneous remote control of all said winding devices.

According to the present invention, the first object is obtained by an electronic control system for motors for the operation of winding devices, such as roller shades, roller gates, rolling shutters and similar, comprising a radio receiver included in the controlled motor and a portable radio transmitter available to the user, wherein the radio transmitter comprises at •.least two push-buttons for the control of the lifting and lowering movement 10 of the winding device, a radio signal transmitting section provided with an •antenna, and a first micro-controller with a first code memory that, at each pressure on at least one of the control push-buttons, sends a codified signal having a respective identification code of the push-button being pressed to the transmitting section, and wherein the radio receiver comprises a radio signal receiving section provided with an antenna and being suitable to S receive the codified signal being transmitted through the transmitting section of the radio transmitter, and a second micro-controller with a second code memory, that at each received signal having one of the codes of the second memory generates a control signal for a control unit provided with a third memory that, upon reception of the control signal, starts the motor in one sense of rotation or in the opposite sense according to the identity of the radio-transmitter push-button being pressed and receives identification data of the rotation angle from an encoder coupled to the motor, so as to allow the rotation of the motor itself up to reach a prefixed limit stop, characterized in that, in order to allow the electronic setting of the position of the lifting and lowering limit stops of the winding device, the first microcontroller is programmed in such a way as to generate a first or second codified signal depending on whether a first or second of said control push buttons is pressed, and the second micro-controller is programmed in such a way that, when receiving one of said first or second codified signal, it causes o -4the generation of a first control signal for driving the motor until a first position of limit stop is reached and an information on the limit stop position generated by the encoder is memorised in said third memory and associated with the pressed push-button that has generated said codified signal, so that subsequently, each time that such push-button gets pressed, the system is ready to have the winding device automatically execute the desired movement up to the programmed limit stop position, the aforementioned .**-.sequence being repeated for the setting of a second limit stop position corresponding to the pressure on the other one of said first or second push- 10 buttons.

According to another aspect of the present invention the second object is obtained by an electronic control system for motors for the operation of winding devices, such as roller shades, roller gates, rolling shutters and similar, comprising a plurality of radio receivers included in respective controlled motors and a portable radio transmitter available to the user, S-wherein the radio transmitter comprises at least two push-buttons for the control of the lifting and lowering movement of the winding device, a radio signal transmitting section provided with an antenna, and a first microcontroller provided with a first code memory that, at each pressure on at least one of the control push-buttons, sends a codified signal having a respective identification code of the push-button being pressed to the transmitting section, and wherein each radio receiver comprises a radio signal receiving section provided with an antenna and being suitable to receive the codified signal being transmitted through the transmitting section of the radio transmitter, and a second micro-controller provided with a second code memory, that at each received signal having one of the codes of the second memory generates a control signal for a control unit provided with a third memory that, upon reception of the control signal, starts the motor in one sense of rotation or in the opposite sense according to the identity of the radio transmitter push-button being pressed and receives identification data of the rotation angle from an encoder coupled to the motor, so as to allow the rotation of the motor itself up to reach a prefixed limit stop, characterized in that the radio transmitter comprises a further push-button connected to the first micro-controller to cause it to generate a radio receiver enabling codified signal and third and fourth push-buttons connected to the first-micro-controller to generate a further codified signal for centralised control of a plurality of radio receivers.

The features and advantages of the present invention will be made evident by the following detailed description of an embodiment thereof, that 10 is illustrated as a non limiting example in the enclosed drawings, in which: Figure 1 schematically shows the functional block diagram of a radio transmitter according to the present invention; Figure 2 schematically shows the functional block diagram of a radio receiver according to the present invention; Figure 3 represents in a schematic way the functional block diagram of a S: radio receiver unit included in Figure 2 Figure 4 represents the external structure of a radio transmitter according to the present invention; o• :..:Figure 5 shows the same radio transmitter-of Figure 4, with open access to a battery.

In Figure 1 the block diagram of a radio transmitter 30 according to the present invention is rendered in a schematic way: There are provided four push-buttons 1, 2, 3 and 4, corresponding to an equal number of channels, the first two purposed to the individual control respectively of lifting and lowering, and the other two destined to centralised controls. The aforesaid channels 1, 2, 3 and 4 are connected with a micro-controller 6, that is connected in a biunivocal way to a memory 7 containing identification codes memorised by the supplier, and connected, in addition, to a signal transmitting section 8 comprising an antenna 9. In addition, a receiver enabling push-button 5 connected with the micro-controller 6 is provided.

-6- In Figures 4 and 5 a radio transmitter 30 as it appears to the user is shown, in which the two lifting and lowering push-buttons 1 and 2, the two centralisation push-buttons 3 and 4 and a red LED radio emission signaller 33 are present. In Figure 4 there is a lid 31 for closing the power supply space, while in Figure 5 the same lit has been removed and therefore a supply battery 32 and the receiver enabling push-button 5 are visible.

Figure 2 represents the block diagram of a radio receiver according to the present invention, divided into two main functional blocks 40 and respectively a radio receiver and a power block. In the control block 40 there are a signal receiving section 11 with a relative antenna 10, a microcontroller 12 which receives signals from the receiving section 11 and is connected in a biunivocal way with a RAM memory 14, an acoustic signaller 13 that is piloted by the micro-controller 12, an amplifier 16 located at the output of the control block 40, and finally a push-button 15 for cancellation of the RAM memory 14.

S"Downstream from the control block 40, and in particular from the amplifier 16, a power block 50 is connected, that comprises a decoding receiver 17 that is connected to a control unit 18, that pilots in turn a power device 19 connected to a ratiomotor 20 destined to the bi-directional operation of the winding shutter or shade. In addition an encoder 21 is provided that is physically associated with the ratiomotor 20 in the way described in EP-A-0671676 and is functionally interposed between the ratiomotor 20 and the control unit 18: The encoder 21 is also preferably of the type capable to detect the sense of rotation of the ratiomotor 20, and therefore of the winding drum of the winding shutter or shade, as also described in EP-A-0671676. A rectifier 22 and a stabiliser 23, downstream from it, provide an appropriate power supply to the micro-controller 12, to the RAM memory 14, to the receiving section 11, to the control unit 18, to the power device 19 and to the decoding receiver 17, getting it from a mains terminal.

-7- In Figure 3 a functional block scheme of the control unit 18 is schematically shown, in which the proper connections with the external blocks are also rendered: internally, the unit 18 is subdivided into a counter block 24, which receives signals from the encoder 21 and is connected to a non-volatile memory EEPROM 25, a comparator block 26, which receives signals from the memory 25 and conveys them to a micro-controller 27, the latter being connected to the remaining external blocks and to the same memory The control system according to the invention is therefore composed of a •"10 radio receiver 40, 50, mounted on the stationary structure of the winding device and, particularly, within the ratiomotor, and of a portable radio transmitter 30 with which it is possible to remotely control the radio receiver and therefore the ratiomotor 20. Each transmitter has four normal-use channels that are operated by the four push-buttons 1-4: such push-buttons are utilisable to control the two senses of movement (lifting and lowering) of the single ratiomotor (push-buttons 1 and 2) and to control the two senses of movement of other ratiomotors in a centralised way (push-buttons 3 and 4).

Through the radio transmitter 30 it is also possible to effect the setting of S. the limit stop points of the device being operated (roller shutter or roller shade), to enable and cancel more transmitters with regards to a receiver element.

According to the application for Italian patent n. VE97A000021 mentioned above, each transmitter sends commands to a receiver by using a signal characterised by an emission code having a determined protocol (for example made up of 66 bits), which is changed at each transmission in a random way (Rolling-code system). Each transmitter also has its own identification code that is recognisable only by the enabled receiver, which code characterises the enabled receiver from others.

Each control system according to the invention, as already said consisting of a transmitter and a receiver, is destined to be supplied to the ii -8user with the transmitter buttons 1 and 2 enabled only, which control lifting and lowering of the winding shutter. First of all it is necessary to carry out setting of the limit stop positions and to this purpose the following operative stages must be performed: a) the push-buttons 1 and 2 of the radio transmitter must be pressed simultaneously for a certain period of time (for example 15 seconds) and the micro-controller 6 immediately sends signals to the memory 7 which contains the relative codes and in turn sends instructions to the microcontroller 6; through the transmitting section 8, the latter sends a codified radiofrequency signal to the control block 40, that is tuned with its receiving section 11 at the same frequency of transmission, in order to be conveyed to the micro-controller 12 which activates the sound signaller 13 in such a way that it produces a sound uninterruptedly for the entire aforesaid period of time. The micro-controller 12 also sends, through the amplifier stage 16 and the decoder receiver 17, a control signal to the control unit 18, which informs it that at the end of the 15 seconds it must zero the entire EEPROM memory 25. In this way, the system is ready for the limit stop information to be set in the EEPROM memory Once the two push-buttons 1 and 2 are released, only one of the two previous push-buttons must be pressed (for example the push-button 1 corresponding to the lifting movement) until the desired (upper) limit stop position is reached and then it must be released. When pressing the pushbutton 1, the micro-controller 6 is activated and sends signals to the memory 7, which contains codes relative to the channel being activated, and it receives instructions therefrom and then sends a codified signal to the receiver through the section 8; the micro-controller 12 informs the control unit 18 of the signal being received, and the latter pilots the power device 19 which in turn activates the ratiomotor 20 and the winding shutter is lifted.

The encoder 21 reads the pitches of the ratiomotor 20 and sends pulses to the unit 18 that through the function 24 starts to count them until the button 1 is released and the movement of the ratiomotor stops.

c) At this point the buttons 1 and 2 must be simultaneously pressed again for a determined interval of time (for example more than 1 second) and then, once they are released, the lifting button 1 must be immediately pressed (within 0.25 seconds) for a certain time, for example more than 1 second. In this way the information on the number of pulses that is generated by the encoder 21 is memorised in the EEPROM memory 25 and in addition such information gets associated with the lifting button 1 in such a way that subsequently each time the push-button 1 gets pressed, the system is ready to execute in a repetitive and automatic way the opening (lifting) movement of the winding shutter up to the programmed limit stop position.

SWith these operations the upper limit stop position is memorised and in order to memorise the lower one too, it is necessary to press the (lowering) button 2 until the desired limit stop position is reached, to release it, to press simultaneously the buttons 1 and 2 for a time longer than 1 second, then to release them and finally to immediately press (within 0.25 seconds) the lowering push-button 2 for a time longer than 1 second: in an analogous way as before, the information relative to the upper limit stop position is memorised in the memory 25, so that at each subsequent command of the press-button 2 the mobile element automatically reaches the aforesaid lower limit stop point.

At this point the transmitter is capable to control the lifting and the lowering of the roller shutter until the automatic arrest at the relative limit stop: for example, by pressing the lifting push-button 1, the micro-controller 6, through the transmitting section 8, sends a codified signal to the control block 40 and therefore the micro-controller 12 is programmed in order to transmit a control signal to the power block 50 in which the control unit 18 is predisposed in such a way so as to activate the power device 19 and to obtain the relative movement of the ratiomotor 20; the number of pulses generated by the encoder 21 and associated with the movement of the ratiomotor 20 is then counted by the block 24 and compared, by means of the block 26, with the information stored in the memory 25, indicating the limit stop position, and in the instance in which the two data become equal, the micro-controller 27 automatically stops the ratiomotor 20 and the winding shutter has reached the desired limit stop position.

If one wishes to enable also the two channels 3 and 4 devoted to the centralised control of more receivers associated with respective winding shutters, one must proceed in the following way: a) in the first stage, in order to enable a determined receiver, the push- 10 button 5 is pressed for an interval of time within which the microcontroller 6 sends a codified signal to the receiver by means of sections 8 and 11; the codified signal is memorised in the RAM S.memory 14 and the micro-controller 12 activates the sound signaller 13 in order to produce a continuous sound; in this way the receiver is enabled to memorise an additional channel in its RAM memory 14; b) within a determined period of time (for example 5 seconds) from the beginning of the sound signal, it is necessary to press the push-button of the channel to be memorised in the memory 14, for example the ~push-button 3; the confirm of the memorisation being done is signalised by a change in the sound produced by the sound signaller 13; c) in order to memorise the last channel remaining to be memorised it is necessary to repeat what described in the aforementioned points, in this case by pressing the push-button 4.

The same operation is to be repeated for all the other receivers intended for the centralised control by the same transmitter.

For the memorisation of channels 1 and 2 and/or channels 3 and 4 of an additional transmitter, for example that arrives new from the supplier, in a system according to the present invention, provided only with its own transmitter, it is necessary to carry out, for each channel of each transmitter -11to be added, the same operations just described for the memorisation of the centralised control channels 3 and 4.

Each receiver can, for example, memorise 64 channels and therefore it is possible to associate a maximum of 32 transmitters with centralised control channels 3 and 4, or 16 transmitters with four channels 1, 2, 3 and 4.

In order to cancel the channels of an additional transmitter or the channels 3 and 4 of the main transmitter it is necessary to carry out the following operations for each channel: the button 5 must be pressed for a •"certain number of times at regular intervals, within a determined period of 10 time (for example for three times within 5 seconds), and in this way from the transmitter 30 to the receiver a codified signal is sent that reaches the microcontroller 12, which activates the sound signaller 13 in such a way that it produces a sound slowly and intermittently, and in addition it predisposes the RAM memory 14 so that some of its locations, relative to certain channels, get cancelled. The subsequent pressure on the push-button of the channel that is intended to be cancelled, within a prefixed time interval (for example 5 seconds) from the beginning of the sound signal, produces the °cancellation of the locations in the RAM memory 14, exactly relative to that determined channel, in such a way that at each subsequent command given with the push-button of the channel that has been cancelled, the microcontroller 12, which gets the relative codified signal from the transmitter does not receive any instruction from the RAM memory 14 and the power block 50 does not get piloted and therefore the ratiomotor 20 does not get activated.

For the purposes of this specification it will be clearly understood that the word "comprising" means "including but not limited to", and that the word "comprises" has a corresponding meaning.

Claims

1. Electronic co-ritrol system for motors for the operation of winding devices, such as roller shades, roller gates, rolling shutters and similar, comprising a radio receiver (40, 50) included in the motor being controlled and a portable radio transmitter (30) available to the user, wherein said radio transmitter (30) comprises at least two push-buttons 2) for the control of the lifting and lowering movement of the winding device, a radio signal transmitting section provided with an antenna and a first micro- controller with a first code memory that, at each pressure on at least 10 one of said control push-buttons sends a codified signal having a respective identification code of the push-button being pressed to said transmitting section and wherein said radio receiver (40, 50) comprises a radio signal receiving section (11) provided with an antenna (10) and being suitable to receive the codified signal being transmitted by said radio transmitter (30) through said transmitting section and a second micro- controller (12) with a second code memory that at each received signal having one of the codes of said second memory (14) generates a control signal fora control unit (18) provided with a third memory (25) that, upon reception of said control signal, starts said motor in one sense of rotation or in the opposite sense according to the identity of the push-button of said radio transmitter (30) being pressed and receives identification data of the angle of rotation of the motor from an encoder (21) coupled to the motor, so as to allow the rotation of the motor itself until a prefixed limit stop is reached, characterised in that, in order to allow the electronic setting of the position of the lifting and lowering limit stops of the winding device, said first micro-controller is programmed in such a way so as to generate a first or second codified signal depending on whether a first or second (2) control push buttons is pressed, and said second micro-controller (12) is predisposed in such a way that, when receiving of said third codified signal for a first prefixed interval of time, it causes the generation of a first control signal for driving the motor until a first position of limit stop is reached and an information on the limit stop position generated by said encoder (21) is memorised in said third memory (25) and associated with the pressed push- button that has generated said codified signal, so that subsequently, each time that such push-button gets pressed, said system is ready to have the winding device automatically execute the desired movement up to the programmed limit stop position, the aforementioned sequence being repeated for the setting of a second limit stop position corresponding to the operation of the other one of said first or second push-button 2). 10 2. Electronic control system according to claim 1, characterised in that *e said first micro-controller is programmed so that a third codified signal initially generated by simultaneous depression of said first and second push- buttons 2) and maintained for said first prefixed interval of time causes said micro-controller to generate a zeroing signal for said third memory (25) and repetition of said third codified signal for a second prefixed interval S-of time after said first or second codified signal followed by repetition of said first or second codified signal for a third prefixed interval of time causes said first micro-controller to generate a second control signal for said second micro-controller (12) to memorise said information on the limit stop position generated by the encoder (21) in said third memory

3. Electronic control system according to claim 1 or 2, characterised in that said radio transmitter (30) also comprises at least two centralised control push-buttons 4) and a receiver enabling push-button which are connected to said first micro-controller so that depression of said receiver enabling push button and subsequent depression of one of the two centralised control push-buttons 4) of the same radio transmitter or of one among the two lifting and lowering control push-buttons 2) or the two centralised control buttons 4) of another radio transmitter within a fourth prefixed interval of time causes generation of a further codified signal for said second micro-controller (12) to memorise an identification code of -lip-- the push-button being pressed in said second memory (14).

4. Electronic control system according to claim 3, characterised in that simultaneous depression of said receiver enabling push-button for a prefixed number of times and subsequent depression one of the two centralised control push-buttons 4) of the same radio transmitter or of one among the two lifting and lowering control push-buttons 2) or the two centralised control buttons 4) of another radio transmitter within said fourth prefixed interval of time cause generation of an additional codified signal for said second micro-controller (12) to cancel the identification code :i 10 of the push-button being pressed in said second memory (14). Electronic control system according to any one of the previous claims, characterised in that said radio receiver (40, 50) comprises a cancellation button (15) for manual cancellation of said second memory (14). S:6. Electronic control system according to any one of the previous claims, characterised in that said radio receiver (40, 50) comprises an amplifier stage (16) at the output of said second micro-controller (12).

7. Electronic control system according to any one of the previous claims, characterised in that said radio receiver (40, 50) comprises a decoding receiver (17) for receiving said control signals from said second micro- controller (12) and to send them properly decoded to said control unit (18).

8. Electronic control system according to any one of the previous claims, characterised in that said radio receiver (40, 50) comprises a rectifier (22) and a stabiliser downstream from it, which provide for a suitable power supply to the radio receiver (40,

9. Electronic control system according to any one of the previous claims, characterised in that said radio receiver (40, 50) comprises a sound signaller (13) and controlled by said second micro-controller (12) to deliver a prefixed sound each time that said micro-controller (12) receives an appropriate codified signal for a prefixed interval of time.

10. Electronic control system for motors for the operation of winding devices, such as roller shades, roller gates, rolling shutters and similar, comprising a radio receiver (40, 50) included in the motor being controlled and a portable radio transmitter (30) available to the user, wherein said radio transmitter (30) comprises at least two push-buttons 2) for the control of the lifting and lowering movement of the winding device, a radio signal transmitting section provided with an antenna and a first micro- controller provided with a first code memory that, at each pressure on at least one of said control push-buttons sends a codified signal having a respective identification code of the push-button being pressed to 10 said transmitting section and wherein said radio receiver (40, comprises a radio signal receiving section (11) provided with an antenna (10) and being suitable to receive the codified signal being transmitted by said radio transmitter (30) through said transmitting section and a second micro-controller (12) with a second code memory that at each received signal having one of the codes of said second memory (14) S: -generates a control signal for a control unit (18) provided with a third OO** memory (25) that, upon reception of said control signal, starts said motor in one sense of rotation or in the opposite sense according to the identity of the push-button of said radio transmitter (30) being pressed and receives identification data of the angle of rotation of the motor from an encoder (21) coupled to the motor, so as to allow the rotation of the motor itself until a prefixed limit stop is reached, characterised in that the radio transmitter comprises a further push-button connected to the first micro-controller to cause it to generate a radio receiver enabling codified signal and third and fourth push-buttons 4) connected to the first-micro-controller to generate a further codified signal for centralised control of a plurality of radio receivers (40,

11. Electronic control system according to claim 10, characterised in that said centralised control push-buttons 4) and said receiver enabling push- button are connected to said first micro-controller so that depression of said receiver enabling push button causes generation of said receiver enabling codified signal and subsequent depression of one of the two centralised control push-buttons 4) of the same radio transmitter or of one among the two lifting and lowering control push-buttons 2) or the two centralised control buttons 4) of another radio transmitter within a prefixed interval of time causes generation of said further codified signal and memorisation of an identification code of the push-button being pressed in said second memory (14). .12. Electronic control system according to claim 11, characterised in that 10 simultaneous depression of said receiver enabling push-button for a prefixed number of times and subsequent depression of one of the two centralised control push-buttons 4) of the same radio transmitter or of one among the two lifting and lowering control push-buttons 2) or the S* two centralised control buttons 4) of another radio transmitter within said prefixed interval of time causes generation of an additional codified signal for said second micro-controller (12) to cancel the identification code of the push-button being pressed in said second memory (14).

13. Electronic control system according to any one of the previous go• 0 claims, characterised in that said radio receiver (40, 50) comprises a cancellation button (15) for manual cancellation of said second memory (14).

14. Electronic control system according to any one of the previous claims, characterised in that said radio receiver (40, 50) comprises an amplifier stage (16) arranged at the output of said second micro-controller (12). Electronic control system according to any one of the previous claims, characterised in that said radio receiver (50) comprises a decoding receiver (17) for receiving said control signals from said second micro- controller (12) and to send them properly decoded to said control unit (18).

16. Electronic control system according to any one of the previous claims, characterised in that said radio receiver (40, 50) comprises a rectifier (22) and a stabiliser downstream from it.

17. Electronic control system according to any one of the previous claims, characterised in that it comprises a sound signaller (13) included in said radio receiver (40, 50) and controlled by said second micro-controller (12) to deliver a prefixed sound each time that said micro-controller (12) receives an appropriate codified signal for a prefixed interval of time. *ego Dated this 24th day of September 1999 S* DELTRON LTD By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent and Trade Mark Attorneys of Australia *S* S. 0o ••g