Hi guys,

I've just finished building a robot with two movement motors and a reversing circuit (for when it bumps into walls). The problem I'm having is that when I switch it on only one motor spins. When I forcibly stop the motor that's spinning the other one starts turning and this one remains stopped. Only one motor is ever spinning.. What's happening and how can I fix this issue?

Thanks,
Thesecret20111

 

Without taking the time to post the circuit, you won't get much in the way of help. Just guessing, though, if your motors are DC type and are in series, I would expect that performance.

 

Without taking the time to post the circuit, you won't get much in the way of help. Just guessing, though, if your motors are DC type and are in series, I would expect that performance.

Yes, sounds right! When you stall one motor (if they are series connected to each other and power source), virtually all the voltage is then dropped across the other one, so it turns and vice verso.
As suggested by BillB, post your circuit for evaluation by forum members.