I am creating a water level sensor.
As I shown on the attached screenshot the Low Level Protection as I marked giving me around 340mv when I measured it with multi meter all other levels are giving me around 2mv and they are working OK
they are all attached to arduino pro mini each to digital pin
They all worked before and something happen I am not sure what I replaced the 10k, 1k and even the BC548 transistor and I am still getting the same result. Where it said SENSOR OUT is RJ45 socket
They all work when I hold the VCC in 1 hand and the level wire with the other hand The Low Level Protection is working only when I touch VCC wire directly to it