![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfxOV_zar-NGNK4H-RYPKkX4Fc42YkJbActl1GaxvEE-dJNrY2WRMj716oUMaPetgGzqmkImrKNy2pKA8tHkY3y2rLmDXC_zpCG_CrLj45T7BM_VtFpBxhU8lH36Rxwvy77xURTnByc4E/s320/IMG_0494.jpg)
Working on this when I can, Pneuman's controller has been upgraded from a chunky old PC with a synchronous serial connection to an Arduino (OMG Arduino!!!). A WiFly shield communicates with the user interface (a PC kiosk somewhere) and a 6-channel Darlington driver board fires the solenoid valves to pump his legs. Three analog inputs are used to capture the values from optical pickups aimed at a 3-bit grey-code encoder wheel fixed to the cranks of the bike. This gives a starting position for the uC to pedal from. Two digital inputs are used for the front and back travel limit switches.
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