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This board was recycled from the Stepping Motor Clock, but uses only one motor instead of its two. Its a different motor, recycled from a printer. There are connectors for the motor, the Sensor Board, the programming connector and the opto-interrupter which re-indexes the pointer. The normal command from the Sensor Board is "A" through "s" for 0-49, but if bit 7 is set the pointer is first re-indexed to 0. The motor turns clockwise until a pin passes into the opto-interrupter, then it completes the re-index by going a fixed number of steps. In normal operation it calculates the number of steps to go to the new position by the shortest direction. Here is the circuit diagram Here is the code |