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simple water detection sensor
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simple water detection sensor

by AleMaker on Sat Oct 16, 2021 11:41 am

I've got the adafruit simple water detection sensor hooked up to a raspberry pi zero. The sensor is receiving 3v and the sensor's led is on. But even with the sensor 3/4 submerged in water, the ouput is only 1.6v, not enough to be detected as positive on the pi GPIO. Do I need to use a ADC with this sensor? I'm concerned that supplying 5v to the sensor may exceed the input voltage on the GPIO pin.

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Re: simple water detection sensor

by franklin97355 on Sat Oct 16, 2021 5:19 pm

Some sensors are unable to swing between limits. I would use an analog pin and keep abreast of the progress.

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Re: simple water detection sensor

by AleMaker on Sat Oct 16, 2021 5:46 pm

Uh, no analog pins on raspberry pi.

I tested that the sensor, supplied with 5v gives an output of about 3.5v max. This seems to be OK for the raspi digital pin. No smoke yet.

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Re: simple water detection sensor

by SQRT_Neg_1 on Fri Oct 22, 2021 5:57 pm

A silicon diode in series will drop the voltage by 0.7v

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