Wiring a motor to the RPi?

What do I need?

I am told that I need some transitors. I have a 12v powerpack and 2 x12v motors. How do I set this up so that I don't blow-up the RPi and that I can control the motors through the GPIO?

I have a gertboard on the way but I would like to see if I can do it without it first.

I have little knowlegde about transitors and electronics but I do know how to build circuits.

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yvanttt over 13 years ago

For the motor control via the joystick it is easy if you can convert the joystick position into values from 0 to 255.

for example:

move the stick forward, both PWM will increase simulatneously. this will increase your speed.
move the stick to the left or right, then deduct the values on one motor to make it turn.
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wallarug over 13 years ago in reply to yvanttt

Would you be able to help me code this?

Also, if the neutral position of the stick is (0,0) then that would mean the range would be from -255 to +255 on both the x- and y-axis. Right?
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wallarug over 13 years ago in reply to wallarug

Every position going up and down the x- / y-axis (+/- 255) will increase the motor speed by an incriment of

100/255 = 0.392157

Is this formula able to be included to decide on the speed of the motor? I will improve it so that it works for all situations.
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wallarug over 13 years ago in reply to wallarug

Every position going up and down the x- / y-axis (+/- 255) will increase the motor speed by an incriment of

100/255 = 0.392157

Is this formula able to be included to decide on the speed of the motor? I will improve it so that it works for all situations.
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