[PD] electro-mechanical piano (player piano) - Arduino, Solenoid Issue

[Charles Goyard]

Epic Jefferson wrote:
> Alexandros and Roman:
> Thanks, i'll check both of your suggestions. I'll let you know how it goes.
> 
> I also just ordered a Practical Maker PWM shield for arduino UNO. 1 shield
> gives you 32 pwm pins and they're stackable, up to 6 without the need for
> an external power supply.
> http://www.practicalmaker.com/products/arduino-shields/pwm-shield-assembled

Beware that you'll need PNP transistor for the power stage, or you'll
get small bumps when the TLCs go BLANK each cycle.