I want to set up a system to measure a set of motors which will be making their way into a robot.
I want to vary the voltage in, and then vary the load on the motor, and measure the amps used.
Voltage in control is easy. As is putting load onto the motor. Measuring the amps seems less easy.
I have found a couple of schematics for such a circut, but they are using shunts, with costs up to £45 a piece.
Am I looking at the wrong thing? Can someone point me in the right direction of a schematic that might help?