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Touch sensor part ID? (infosec.pub)

submitted 1 month ago* (last edited 1 month ago) by Sadbutdru@sopuli.xyz to c/askelectronics@discuss.tchncs.de

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Can anyone help me identify this touch sensor module from a UK home bathroom light switch?

The IC is a QT113 charge transfer touch sensor, the only writing on the board is SAT 02.

I'd like to know enough about it to order replacements.

https://sopuli.xyz/pictrs/image/256ab3e9-90b3-4e38-affe-5c716332cbc3.webp

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[–] Tolstoy@lemmy.world 4 points 1 month ago (1 children)

Easier way is to measure the voltage and get a new sensor... Afaik this qt113 runs at 5V

[–] Sadbutdru@sopuli.xyz 3 points 1 month ago (1 children)

I have the datasheet for the qt113, it indeed uses 2.5-5 V. But I don't know what wide is going on there.

Is that other black component a transistor, and that's what's doing the switching for the lights based on the sensor output? Or is this whole board sending a digital signal to something else that switches the lights?

[–] Tolstoy@lemmy.world 2 points 1 month ago

It's way out of my knowledge but it looks like the electrode for the touch is missing. It should be on the left corner where the "02" is printed on.

As you guessed the black thing is a transistor and should switch a led or probably a 5V relay. But please be careful since I'm guessing too xD