hi everyone. so i'm trying to use a DC 24V 225mA power supply to power a AD595 thermocouple controller. I've been told that i should keep the logic and the power supply ground separated.
but i wanted to run the arduino off of the 24V supply stepped down to 5V using a 7805. is it okay to make the grounds common? or should i have 2 separate ground planes? (don't want to have a current spike at the arduino ground pin
and if 2 ground planes exist, will the analog signal out of the AD595 float significantly? and would the 7805 be tied to the power supply ground, or the arduino ground?
thanks for the help