VH400 Moisture sensor question
My first post here. I am not a technician. Just trying to use Vegetronix' excellent capacitive moisture sensor VH400. All works perfectly but I am still not completely happy.
I am monitoring the sensor with a small digital votmeter that has a resolution of 0.01v. I know this is overkill, you normally do not need this kind of precision.
Yet, I would like to understand something.
The reading of the sensor is perfectly stable but while monitoring it, it seems that the reading on the voltmeter sticks to a value until a significant change in value is reached. Intermediate steps do not show up on the voltmeter. I know the sensor has that resolution though.
If I turn off the power supply of the mini voltmeter and then turn it on again (just by unplugging it), then I can see those intermediate steps.
Would anybody know how to prevent the led digital voltmeter from "sticking" to a value and displaying all values without having to unplug it ?
The reading of the sensor is perfectly stable but while monitoring it, it seems that the reading on the voltmeter sticks to a value until a significant change in value is reached.
Probably some hysteresis programming in the volt meter...
did you try to monitor the voltage with your arduino sensor yet?
Thanks for your reply.
Yes, hysteresis programming makes sense. But when I am testing these small voltmeters with a power supply they respond to the 0.01v changes...
I have not try to monitor the voltage with the arduino sensor yet but I did test it with a multimeter that uses a lcd display. Works fine there...