[sdiy] DIY Drums

[Ingo Debus]

Linium wrote:
> Next, do you thing that once the wave is half-rectified with a diode i need
> to buffer it with a caps so that the MCU can read it, or should i write some
> asm code instead to keep the highest sampled value in a window time and send
> it to the computer ?

Are the ADC and the processor fast enough for this? It has to catch the
maximum, this might be present for a pretty short time.

I built a similar thing, but I used a peak-hold like it is described in
Horowitz & Hill for each sensor. The peak-holds are reset by small
MOSFETs (BS170) which are controlled by the microprocessor. Once the
processor detects that a sensor was hit, it resets the peak-hold.

I didn't use piezos as sensors but tiny loudspeakers instead (just
because I got them cheap).

Ingo