Hi there
I am using an arduino nano evry to monitor a voltage from a current sensor and switch an output pin High when it is above a set threshold. This is to drive a probe input to the motion controller of a cnc plasma cutter.
That output goes through an opto-isolator in order to change its voltage to a 24v signal.
The trouble i am having is the output of the nano never being absolute 0V is actualy making the opto-isolator flicker on and off, especially as it gets closer to the threshold voltage for setting the pin as High,
This is resulting in false probe hits which is bit annoying, but i dont want to simply increase the threshold voltage as i would loose sensitivity.
I did try a 1k resistor between the pin and ground, but i must have done something wrong as that didnt seem to work, the Low output still had around 0.5v or so and the led on the opto-isolator still flickers,
What am I getting wrong?
Any help greatly appreciated !
13 posts - 6 participants