Limit switches: A mechanical limit switch interlocks a mechanical motion or position with an electrical circuit. A good starting point for limit-switch selection is contact arrangement. The most ...

If you use an H bridge to drive the motor, you can achieve the same operation in a more versatile way. The circuit in Figure 2 shortens one input of the H bridge to ground so that movement is possible ...

Essentially, each pnp transistor compares a reference voltage on the npn emitter with the voltage across the lower limit switch circuit resistors R4, 5 and 6, directing current to the led if the limit ...