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That way, I can get a very good estimation of the peak value. >The reason why the inputs are sampled fast is that it’s required to get at least a few samples per milliseconds to process the piezo signal properly. And since that’s actually something I tried, I can even confirm that you don’t get that unless you can 8 very similar transistors, which is difficult in practice. I highly doubt you can get something that good with transistor. With the op-amp, and precise resistors (which is pretty easy to find) I get a DC offset of 512 +/- 1 when I use the ADC in 10-bit mode.Īnd I get that same value for all the piezos. In theory, yes it works well, in practice, the base impedance depends on beta, the output DC voltage depends on VBE, etc. That’s still not as straightforward as you think. > You add a bit of negative feedback anyways to stabilize it, otherwise you’d get a gain of 200-400 instead of the 2 that you need for this signal and your ADC input would simply saturate. The only alternative is a full-bridge rectifier, or something that behaves the same way (gives you the absolute value). Some piezos will have the dynamics in the negative values, others in the positive voltages. I think it’s important that people see the board as something “simple”.
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The other drawback is that transistor parameters vary a lot from one to another, so you’ll never get the same gain, and response… Plus using op-amps makes the board easy understand, to reproduce and to learn. I considered using a common collector amplifier, thinking it would require less components, but it’s not such a good idea.įirst of all, they barely reduce the board size, as there’s always some space between a transistor and its neighbor. That way, the board can be future-proof as well. Plus, if you want to do some more advanced stuff, such as positional sensing, you do need to keep to whole waveform (positive and negative peaks).Įven though that’s not something I currently do, the board can be used with other microcontrollers than the Arduino Nano Every, for instance, a more powerful STM32, which would allow positional sensing computations. I wouldn’t say that it doesn’t matter if we clip the negative part of the piezo voltage.įor instance, my Roland pad has a lot of dynamics on the first negative peak, but the second peak, which is positive, doesn’t. Posted in Arduino Hacks, Musical Hacks Tagged arduino, c++, digital, drum, exadrums, hardware, kit, music, Nano Every, speed Post navigation This isn’t the only path to electronic drums, though, as we’ve seen with this build which converts an analog drumset into a digital one.
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has released the source code on his GitHub page for those curious about the build, and is planning on releasing several more blog posts about the drum kit build in the near future as well. With that being said, the hardware isn’t the only thing standing out on this build.
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Some of the solutions to the software timing are made up for with the hardware on the specific Arduino he chose to use, including an even system, a speedy EEPROM, hardware timers, and an ADC that can sample at 150k samples per second. It is much easier to work with though, and explains this in great detail over a series of blog posts detailing his drum kit’s design. Playing music in real life requires precise timing, so the choice of C++ as a language poses some problems as it’s not typically as fast as lower-level languages.
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To solve at least part of that one, turned to using an Arduino to build a drum module on his own, but he still had to solve yet a third problem: how to make the Arduino fast enough for the drums to sound natural. For that problem there are still electronic drums which can be played much more quietly, but then the problem becomes one of price. Drums are an exciting instrument to learn to play, but often prohibitive if there are housemates or close neighbors involved.
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