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Postby Robert » Sun Jan 24, 2016 1:12 pm

Cannot get the motor supplied with the kit to turn, it is rigid, but the LEDs flash indicating the board and program are working..
However I have two stepper motors from an HP printer, but voltage not indicated.
The step-my-pi board has a jumper allowing an external supply to be connected for the motors. What is the maximum safe voltage which can be applied between centre pin and ground?
I have tried 12 volts no joy, but I know that my old HP printer had a 30v supply, so maybe these motors need that.
But is it safe to apply 30v to the external input on the step-my-pi board?.


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Postby Jake » Mon Jan 25, 2016 1:08 pm

Hi Robert,

The board uses a ULN2803 IC (datasheet below)

This has a maximum voltage input of 30V

The stepper motor should just about be manually turn-able using your fingers (they are stiff though).

The 28BYJ-48 stepper included is a 5V board, so you will only need that to operate it.

There's a great guide on using the board here if you haven't come across it yet: ... board.html

-- Jake


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