Here is a very wee motor control board for your Pi from the UK, PiBorg:
With PicoBorg, you can turn on and off fans, motors, solenoids, relays etc. from your Raspberry Pi.
There are 4 low side drivers so you can turn on and off 4 devices
One is connected to the RPi PWM pin, so you can vary duty cycle (normally vary speed).
Only £5.99 or Available with cables for £9.99
- 4 fans on/off control over all and vary speed on one fan
- 4 solenoids
- 4 DC motors (on / off control over all and vary speed on one motor)
- or a combination of these
- or control one 6 wire stepper motor in both directions
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