Since diode cr1 will not conduct with a negative potential across it the motor will stop.
Dc motor limit switch circuit.
A very cool and easy dc motor speed controller circuit could be build using a just a single mosfet a resistor and a pot as shown below.
The interlocks are specially important because if both relays are on it would be a short circuit.
Imagine you have two circuits each carrying the same current one is an ac circuit and the other is a dc circuit.
The motor should then rotate until it hits the other limit switch and then wait for the button to be pressed again to rotate in the opposite direction.
The switch s1 is used to instantly reverse the motor direction whenever.
As illustrated the relays have to be dc same coil voltage as the motor but the bottom can be separated and fed from a different voltage.
I have attached a schematic using push buttons instead of limit switches.
The circuit uses 2 relays 2 limit switches and a dc motor.
Any help in amending the code to include the limit switches would be greatly appreciated as i am a bit out of my depth.
When you switch off power to an ac circuit a voltage spark or arc is created.