Open! IR! Free Technical Library article. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Open! IR! Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / infrared technology

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It was like that at one of my former jobs. Then they put an electric lock on our room door - you know, one with an electromagnet. And everything would have been fine, but only one button was attached, and there were eight of us sitting there. Thus, if there was no person near whose place this button was equipped, then in order to open the door, one had to jump up and run to the button.

Of course, this suited few people, especially me, since I was that person. And I had to press that damn button all the time. And in the room we hung air conditioning, with a remote control, of course. Well, the idea came up to make a door opener that works from control panels for various consumer electronics. Which is what was done.

Let's look at the diagram:

(click to enlarge)

A ready-made IR module is used as a receiver TSOP1738. This is very convenient, because it simplifies the circuit to disgrace.

Well, then there is a microcircuit that forms a continuous high level based on the transistor VT1 to trigger the relay when the remote control button is pressed.

The transistor will be open during the entire period of pressing the button. After releasing the button, the transistor will close and the relay will open.

In general, the main point of all these dances is to ensure the noise immunity of the circuit. So that it does not turn on from matches, lighters, sunlight, fluorescent lamps and other things. This work is performed by the node on the elements D1, R1, C3. It forms a small delay in the operation of the circuit, due to which the probability of false operation is reduced. Capacity increase С3 causes an increase in this very delay, which has a positive effect on noise immunity, but requires a longer press on the remote control button. The ratings of all components are indicated on the diagram. Relay - any, designed for a voltage of 5 volts and a current of 20-30 mA. I used an old reed switch that I had lying around from the old clay times. You should not be greedy on capacitors - the IR module is very sensitive to power supply interference. Nutrition, of course, must be stable.

Publication: radiokot.ru

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