IR remote control turns on electrical appliances. Scheme, description

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IR remote control turns on electrical appliances. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / infrared technology

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The remote control (RC) of your TV, VCR, satellite receiver, music center, etc. can be used to turn lights on and off, as well as other electrical appliances. To do this, you need to make a special switching device, which is described in the proposed article.

One of the options for a device designed to control appliances using a standard remote control was described in the article by S. Biryukov "The remote control of the TV controls the chandelier" ("Radio", 1999, No. 12). Readers are offered a simpler and more versatile version of such a device that does not require decryption of remote control commands, which can work with any remote control, including a simple home-made one.

The following algorithm is used to control the devices. From the remote control, give a command (any) and hold the button pressed for 1 s. The device does not respond to short-term button presses (for example, when operating a TV). In order to exclude the reaction of the TV to an attempt to control the device, you need to select unused buttons on the remote control or use the remote control from the device that is turned off at the moment. Another option is to use such buttons on the remote control, pressing which (at a particular moment) will not lead to a change in the operating mode. For example, pressing the channel selection button corresponding to the program currently being received will not affect the operation of the TV in any way.

The scheme of the device is shown in fig. 1. Specialized chip DA1 amplifies and converts the signal of the photodiode BL1 into electrical impulses. A comparator is assembled on elements DD1.1 and DD1.2, and a pulse generator is assembled on elements DD1.3, DD1.4.

(click to enlarge)

The state of the device (on or off load) determines the trigger DD2.1. If the direct output of this trigger is high, the oscillator will operate at a frequency of about 1 kHz. Rectangular pulses will appear on the emitters of transistors VT1 and VT2, which will go through the capacitor C10 to the control electrode of the triac VS1. It will open at the beginning of each half cycle of mains voltage.

In the initial state, there is a high logic level at pin 7 of the DA1 microcircuit, the capacitor C5 is charged through resistors R1, R2 and at the input C of the trigger DD2.1 there is a low level. If IR pulses from the remote control are received on the BL1 photodiode, pulses will appear at pin 7 of the DA1 microcircuit and the capacitor C5 will be discharged through the diode VD1 and resistor R2. When the voltage at C5 decreases to the lower threshold of the comparator (after 1 s or more), the comparator will switch and a pulse will be sent to the input of the trigger DD2.1. The state of the trigger DD2.1 will change. Thus, the device switches from one state to another.

Microcircuits DD1 and DD2 can be used similar ones from the K176, K564 series. VD2 - a zener diode for a voltage of 8 ... 9 V and a current of at least 35 mA. Diodes VD3 and VD4 - KD102B or similar. Oxide capacitors - K50-35; C2, C4, C6, C7 - K10-17; C9, C10 - K73-16 or K73-17.

Most parts of the device are mounted on a printed circuit board made of one-sided foil fiberglass, a sketch of which is shown in Fig. 2.

IR remote control turns on electrical appliances

The board is installed in a housing made of insulating material. Resistor R8 and capacitor C9 are installed by surface mounting. Triac VS1 with a load power of more than 250 W must be installed on the heat sink.

The adjustment of the device is reduced to the selection of the resistor R2 in such a way that the switching occurs after 1 ... 2 s. If an increase in the resistance of this resistor will lead to the fact that the capacitor C5 will not be discharged to the threshold voltage, it is necessary to use a capacitor C5 with a capacity 2 ... 3 times larger, and repeat the setting. Capacitor C6 must be installed if the duration of the front of the pulse coming from the comparator to the trigger is too large and it will switch unstably.

If the remote control used does not allow you to control the device without interfering with the TV, you can make a home-made control panel, which is a rectangular pulse generator with a frequency of 20 ... 40 kHz, operating on an IR emitting diode. Variants of such a remote control on the KR1006VI1 timer and a logic chip are shown in fig. 3 and 4.

(click to enlarge)

Author: I. Nechaev, Kursk

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