Infrared switch with remote control. Encyclopedia of radio electronics and electrical engineering

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The proposed device is designed to turn on and off (including remote) incandescent lamps, heaters and other devices powered by a 220 V household network and representing a purely active load with a power of up to 500 W. The switch diagram is shown in fig. 1.

Rice. 1 (click to enlarge)

An alternating voltage of 220 V through the fuse FU1 is supplied to the power unit assembled from the elements VD3, VD4, C3, C5, C7, R7 and R9. A stabilized voltage of 5 V from the capacitor C5 feeds the microcontroller DD1 and the photodetector B1. The microcontroller, working according to the program written to it, analyzes the signals coming from the photodetector to the RB5 input and from the SB1 button to the RB1 input, as well as from the network voltage zero-phase sensor (resistor R6, diodes VD1, VD2) to the RA1 input. The signals generated at the outputs RB0 and RB4, the microcontroller controls the triac VS1 and the LED HL1, respectively. The switch changes its state to the opposite each time you press the SB1 button or the button on the remote control. Two program options are offered. Working on the first of them (file irs_v110.hex), the microcontroller remembers the current state of the switch and, in the event of a temporary power outage, restores this state when it is resumed. When using the second version of the program (file irs_v111.hex), restoration of the mains voltage always switches the circuit breaker to the off state. LED HL1 lights up when the load circuit is open. This is useful when controlling lighting fixtures. The scheme of the remote control switch is shown in fig. 2.

Fig. 2

It is powered by two AAA galvanic cells. When you press the SB1 button, a pulse generator with a duration of about 18 ms, assembled on logical elements DD1.1 and DD1.2, starts working. These pulses control the 36 kHz pulse generator on the elements DD1.3, DD1.4. Packets of pulses from the output of this generator are fed to the gate of the transistor VT1, in the drain circuit of which an IR emitting diode VD1 is connected. Establishing the remote control comes down to setting the generator on the elements DD1.3, DD1.4 to a frequency of 36 kHz (the resonant frequency of the photodetector B1 in the switch) by selecting resistor R4. When properly configured, the maximum remote control range of the circuit breaker is achieved. The circuit board of the switch is shown in fig. 3.

Fig. 3

The triac VT137-600 is mounted on a heat sink made of an aluminum plate measuring 65x15x1 mm. A replacement for this triac can be selected from among similar devices of the VT136, VT138 series. The BZV85C5V6 zener diode is replaced by another small-sized one with a stabilization voltage of 5,6 V, for example, KS156G. Instead of the TSOP1736 photodetector, another of the TVs and other household electronic devices used in remote control systems will do. The center frequency of the passband of such a photodetector may lie in the range of 30...56 kHz, so the remote control will have to be tuned to this frequency. If it is necessary to expand the sensitivity zone of the switch in the horizontal plane, instead of one photodetector, two can be installed, pointing them in different directions. In this case, conclusions 1 and 2 of two photodetectors are connected in parallel directly, and conclusion 3 is connected through resistors with a nominal value of 1 kOhm. The common point of the resistors is connected to pin 3 of block X1, and the resistor R3 in the switch is replaced with a jumper. The printed circuit board of the remote control is made according to the drawing shown in fig. four.

Fig. 4

Here, as VD1, you can use any IR emitting diode from the remote control of a household appliance. It is undesirable to replace the HEF4011 chip with a similar domestic K561LA7. When the supply voltage is low, it works unstably. On fig. 5 shows the appearance of the switch boards and the remote control.

Fig. 5

Download microcontroller programs

Author: S. Ivanyuta, Stary Oskol, Belgorod Region; Publication: cxem.net

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