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

[Epic Jefferson]

Roman, I tested your [solenoiduino] patch and it doesn't quite do what i
expected. But i think i can expand on this idea.

So, right now you send the pin number and the amount of ms you want it to
be HIGH, but what if you don't know how long it will be? for instance a
live performance situation. Using this technique you can send a short pulse
to achieve some dynamic control, but you can't hold a piano key down, for
example, because the pulses will always be full power.

I need to check if I can modify the solenoiduino firmware to receive the
second byte as 'velocity' instead of 'duty cycle' and use that for pwm
control. I'll let you know how it goes.


On Thu, Jun 27, 2013 at 5:20 PM, Epic Jefferson <jeffreyconcepcion at gmail.com
> wrote:

> Charles:
> Yeah, we're building custom drivers for the solenoids and we built a 30v
> power supply as well.
>
>
> On Thu, Jun 27, 2013 at 4:43 PM, Charles Goyard <cg at fsck.fr> wrote:
>
>> 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.
>>
>>
>>
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>
>
> --
> www.epicjefferson.com
> www.avmachinists.org Puerto Rico based Art Collective/ Non-Profit Org
>



-- 
www.epicjefferson.com
www.avmachinists.org Puerto Rico based Art Collective/ Non-Profit Org
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