An speaking of PWN, check this out! PiFace controls motor speed with PWM, from Element14. Here’s a blog tip from Drew Fustino:
At first glance, it seems like the PiFace outputs can’t do PWM because they hang off a SPI I/O extender. However, Gordon Henderson of drogon.net and WiringPi figured it out. I wrote blog post about Gordon’s demo code and a video I shot of the motor….
From the Element14 blog:
To follow up my last post, PiFace relay tricks: metronome & “playing” middle A, I’d like to show how Gordon’s PiFace PWM code can be used to control the speed of a DC motor connected to one of the PiFace output screw terminals….
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