Hi
I am having a little trouble calibrating my new ph probe, and could please use a little help. First off let me say I am a software developer by day, and just trying to learn electronics, so I have a little tech experiance.
I have wired it up like so:
V+ => 5v
G => G
Po => Ao
I have read this article, which states that as part of calibration, you need to short the sensor by poking a wire into the BNC connector and touching the outside. You can then use the offset pot to calibrate the value to 2.5v However when using the sketch in the article the lowest I can get the value when tunring the pot is 4.1
Am I missing something? At first I thought it could be a problem with the probe so I purchased another and that is the same. Did I get 2 broken items, or am I doing something wrong (more likley )
Sorry for the late reply, I was waiting for a multimeter to be delivered, I also ordered an Arduino Uno as another device to test against (I was using a Wemos D1) When using the Arduino I get the correct values, however it seems when using the Wemos I get something different?