Pyrus
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This photo attached is an automatic tap. It doesn't seem to have Infrared sensor. Then, which type of sensor is it... Just wondering :p
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Pyrus
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Because that black thing doesn't seem glass like but has rough plastic like texture...
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Could be that the rough texture is deliberate. Most passive IR sensors have a grid like lens so that the sensitivity of the sensor isn't uniform over it's field of view. This increases the amplitude fluctuations that the sensor receives when there is movement.
http://www.blunet.net.cn/uploads/Sensor-Detector/PIR-Sensor/wall-mounted-occupancy-sensor.gif
http://www.blunet.net.cn/uploads/Sensor-Detector/PIR-Sensor/wall-mounted-occupancy-sensor.gif
Duh, I'm a little slow sometimes...berkeman said:
Just take your IR Remote Control for your TV, and hold it in front of the faucet (but out of the path of the water). Wait for the faucet to shut off if your movement turned it on, and then push a button on the control without moving your hand or the control. If the faucet turns on, it's using a PIR sensor. You can even try backing up a ways to see how far away from it you can get and still operate the faucet with your IR Remote Control.
And just for completeness, you can use your cellphone camera viewer to see the IR transmissions coming out of the Remote Control when you push a button...
