simple water detection sensor
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- AleMaker
- Posts: 4
- Joined: Sun Jan 24, 2016 12:10 pm
simple water detection sensor
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.
- Franklin97355
- Posts: 23910
- Joined: Mon Apr 21, 2008 2:33 pm
Re: simple water detection sensor
Some sensors are unable to swing between limits. I would use an analog pin and keep abreast of the progress.
- AleMaker
- Posts: 4
- Joined: Sun Jan 24, 2016 12:10 pm
Re: simple water detection sensor
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.
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.
- SQRT_Neg_1
- Posts: 39
- Joined: Mon Aug 23, 2021 6:25 pm
Re: simple water detection sensor
A silicon diode in series will drop the voltage by 0.7v
Please be positive and constructive with your questions and comments.