Magic switch
Flu epidemics is dedicated.
Dirty switch in public places, and at home - a terrible hotbed of all kinds of microbes. In the layer of skin secretions, they feel very, very good. This problem can be solved easily and simply - make a contactless switch, which is not necessary to touch. The benefit of the technique came to realize that it’s not difficult
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To fix the approach of the hand to the switch, you can use 2 types of sensors. Capacitive - approaching the hand will change the capacitance of the capacitor, and optical - the hand reflects a certain part of the optical radiation. This design uses the optical principle that was previously used in the design of IC_bamper a.
The principle of operation is as follows. A microcontroller installed in a switch measures the amount of light by a phototransistor when the IR LED is turned on and off. If there is an obstacle in front of the switch, then part of the IR radiation will be reflected, and the difference between the measurements will appear. As soon as this difference exceeds a certain threshold, the relay will operate and switch on the load.
Device layout:
Notes:
1) The switch is always energized and requires 220V for its operation, therefore it may be incompatible with the wiring supplied to a conventional switch
2) The LED and phototransistor should be optically isolated from each other, such as an opaque wall.
Specifications:
Hand detection distance: 5-15 cm, depending on light
Power consumption: not more than 1.5 W
Possible uses
In addition to working as a light switch, a sort of high-tech toy, you can use it wherever touch is undesirable. For example, the management of the drain in a public toilet. Controlling the flow of water through the faucet. Hundreds of possible applications.
Original article: http://licrym.org
As usual, this is the only repost associated with the stinkiness of the licrym.org project server.
Dirty switch in public places, and at home - a terrible hotbed of all kinds of microbes. In the layer of skin secretions, they feel very, very good. This problem can be solved easily and simply - make a contactless switch, which is not necessary to touch. The benefit of the technique came to realize that it’s not difficult
')
To fix the approach of the hand to the switch, you can use 2 types of sensors. Capacitive - approaching the hand will change the capacitance of the capacitor, and optical - the hand reflects a certain part of the optical radiation. This design uses the optical principle that was previously used in the design of IC_bamper a.
The principle of operation is as follows. A microcontroller installed in a switch measures the amount of light by a phototransistor when the IR LED is turned on and off. If there is an obstacle in front of the switch, then part of the IR radiation will be reflected, and the difference between the measurements will appear. As soon as this difference exceeds a certain threshold, the relay will operate and switch on the load.
Device layout:
Notes:
1) The switch is always energized and requires 220V for its operation, therefore it may be incompatible with the wiring supplied to a conventional switch
2) The LED and phototransistor should be optically isolated from each other, such as an opaque wall.
Specifications:
Hand detection distance: 5-15 cm, depending on light
Power consumption: not more than 1.5 W
Possible uses
In addition to working as a light switch, a sort of high-tech toy, you can use it wherever touch is undesirable. For example, the management of the drain in a public toilet. Controlling the flow of water through the faucet. Hundreds of possible applications.
Original article: http://licrym.org
As usual, this is the only repost associated with the stinkiness of the licrym.org project server.
Source: https://habr.com/ru/post/75921/
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