Hi.
I am trying to use a 24v fan from a gas boiler in a project I'm working on. I have attached a circuit diagram.
I have a 24vdc supply hooked up to it.
I'm trying to use an arduino uno to adjust fan speed.
It's set up to output 3khz from pin 9 to the pwm input on fan.
There is a potentiometer wired in to change the duty cycle.
The problem is that I'm pretty sure the pwm needs a ground. It appears to be sharing the ground from the 24v supply in the circuit diagram.
But I've read that I cannot connect the 24v ground to the arduino without damaging it.
Can anyone explain simply how to wire this up?
I am trying to use a 24v fan from a gas boiler in a project I'm working on. I have attached a circuit diagram.
I have a 24vdc supply hooked up to it.
I'm trying to use an arduino uno to adjust fan speed.
It's set up to output 3khz from pin 9 to the pwm input on fan.
There is a potentiometer wired in to change the duty cycle.
The problem is that I'm pretty sure the pwm needs a ground. It appears to be sharing the ground from the 24v supply in the circuit diagram.
But I've read that I cannot connect the 24v ground to the arduino without damaging it.
Can anyone explain simply how to wire this up?