I am powering a BS1 with a small DC motor turned by a hand crank geared to it with a belt. So far this is working with the following setup (see image). The only action the basic stamp performs is to powers on a stepper motor for about 1 second out of every five. The rest of the time it is pausing. When I stop turning the crank, all functions cease. When I turn the crank again, all functions resume. Everything cool, right? Well I am encountering some massive feedback through the motor/dynamo. As i turn the crank and the stepper activates, when the stepper comes on, there is huge tension on my hand crank and it becomes 3-4 times harder to crank. I have taken apart all of my mechanism and found that this tension is coming from my dynamo. If I stop turning (and the basic stamp shuts off) and then begin turning again, the tension is gone, and the dynamo is easy to turn again. Any idea whats going on? I just added a diode on the ground to try and somehow fix this but it didn't work.
and my stepper/BS1 setup: