October 13, 2009
I am having trouble with a project and hope someone can help. I have a pwm motor speed controller I bought from Carl's electronics (see http://www.electronickits.com/kit/complete/motor/ck1400.htm). I put this together and it works fine. Then I rigged a n channel mosfet to turn on and off from a rf receiver signal, with just the motor this works fine. Flip the receiver on the motor goes on, flip the receiver off the motor goes off (I used the mosfet circuit in this post from LMR http://letsmakerobots.com/node/4285). Problem is I can't put the pwm circuit together with the rc controlled mosfet switch. I want to be able to turn the motor on and off with the remote and while it is on adjust the speed with the pwm circuit. Eventually I need to be able to stop the motor in a specific position, I was going to tackle that after I got the rc part working. Any help would be greatly appreciated.
I forgot to mention when I wire the rf signal to turn on the mosfet that controls the pwm circuit it turns the circuit on but it won't turn off.