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microDrum piezo pad help

chicocybergoth

Hi everyone, I am putting together a homemade electronic drums, after a lot of research I found the microDrum project, at first this seemed well produced and with enough functions, as I went deeper I realized that a lot of information is missing, the documentation is weak.

I was able to install on the Arduino, mount the circuit with the multiplexer, I can run the setup program, I can receive the data in the program.

But I was not able to use anything related to VST in it, I always get an error, so far I have not had any audio output from the system, and I have not yet worked with a standard MIDI port, I hope I have no problems. The MIDI signal is what interests to me.

The site cites "DrumScope" but there is no instruction, I can not get it to work.

 

Anyway, I think the biggest problem at the moment is the pads.

They are giving multiple shots or they are so slow that they lose beats, I can not find the sweet spot.

Because of the lack of instructions I do not quite understand what each of the configurations does.

I started to get worried about the construction of the pad itself, I'm using a training battery as a base, for each pad I put sponge on it, then a steel plate and then a rubber.

The piezo was glued to the steel plate.

I am worried that this steel plate is the problem, because it is very heavy, it is around 220g.

 

What do you think?

Thanks any help or info.

Thank you very much.

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  • in reply to michaelkellett

    Hello Michael.

    Ok, I'm sending some images.

    The training drum set (cat not included hahahah)

    Pad front and side view.

    Circuit diagram (same but just 1 mux).
    Circuit in breadboard.Pad output in the oscilloscope (I removed from the mux and connected the piezo directly to the oscilloscope).

    It is a simple oscilloscope but I believe it is enough.

     

    EDIT: I have noticed something about the circuit, the only difference is that 1M resistor at the left side, between the light blue and red lines, I have not understood it and not included.

    I have connected the piezo to gnd and mux input directly.
    Also, I dont have the CD4851 so I'm using the CD4051.


    Thanks for your answer.

    The training drum set (cat not included hahahah)

    image

     

    Pad front

    image

     

    Pad side

    image

     

    Circuit diagram (same but just 1 mux)

    .image

    Circuit in breadboard.

    image

     

    Pad output in the oscilloscope (I removed from the mux and connected the piezo directly to the oscilloscope).

    image

  • in reply to chicocybergoth

    It would be much better to use the correct mpx chips, they have been chosen because they will stand over voltage on the inputs much better than 4051 types.

     

    I don't know how the software works and how well it copes with the kind of waveform your pads are making - do you have a commercial pad to compare with ?

     

    MK

  • in reply to michaelkellett

    I'm having trouble finding the right integrated circuit, but I've already placed the order, it will be a long time to arrive.

    Unfortunately I do not have any commercial pad, I'm going to have to find a way with the ones I have.