Converting piezo sensor analog inputs into digital outputs for Taito no Tatsujin drum controller about gp2040 HOT 4 OPEN

Hello @pizzacatz

I'm currently working on a board for that exact purpose (Piezo input to digital) for games like Taiko no Tatsujin and Rock Band etc. The 1st project you linked to constantly polls the pins with the piezos attached. That is a problem, since lag would be introduced (To some degree).

What I am working on, is a board that would convert the signal from the piezos (Like commercial e-drums) to a digital signal. Having done that, the controller software (Like GP2040) would be able to trigger on interrupts, so lag can be minimized.

What kind of drums were you thinking of as using for inputs? I have Yamaha e-drums that I would like to use, but I'm also playing around with a design for a Taiko no Tatsujin controller.

Let me know if you would like to be involved (In any way). It would be much more fun, if I was not doing it alone without feedback.

Regards,
Tobias

from gp2040.

Hello @tobiasbp,

Thank you for sharing your findings with me. I didn't know that the first project would introduce lag, so I will have to continue my research. My current idea is to use 4 separate Arduinos that each simulate a pushbutton using a transistor. I do not have electrical engineering or circuitry experience, so I will continue my research.

Currently, I am thinking of a segmented design like this that would use a piezo on each segment. I believe this is how the commercially available Tatacons are designed.

I do not have a programming background, but I would love to be involved in your project!

Best,
pizzacatz

from gp2040.

My current idea is to use 4 separate Arduinos that each simulate a pushbutton using a transistor.

You don't need that at all. You just need Pi Pico loaded with GP2040 (Or an Arduino set up as a USB device), and some circuitry to create a digital signal from the piezos (The project I'm working on).

Currently, I am thinking of a segmented design like this that would use a piezo on each segment. I believe this is how the commercially available Tatacons are designed.

I don't think they use piezos. I'm pretty sure the use a sandwiched design like the soft DDR pads. You can see the tatacon being modded here.

I do not have a programming background, but I would love to be involved in your project!

Sounds good. It would be nice with some moral support. I'll create a repository for the project, and we can continue creating a board that could be used to feed RP2040 (Or any other controller) with digital inputs from piezos.

from gp2040.

You don't need that at all. You just need Pi Pico loaded with GP2040 (Or an Arduino set up as a USB device), and some circuitry to create a digital signal from the piezos (The project I'm working on).

I am trying to do something similar to OP, but I am using an existing PS2 taiko drum. The PS2 taiko drum uses a resistive array. I currently have each section of the drum connected to a resistor divider, and the middle going into the pi pico analog input. Using the pi, I can read the analog inputs and detect the hits of the drum. I was planning to use circuitpython and the adafruit keyboard library for sending the hits to the computer, but it seems the library is not fast enough because although I can print a message when the drum is hit, the keystrokes aren't sent fast enough and only about a quarter of the hits are actually sent as keyboard messages.

Would your project be required for this too? I'm ok with some input lag sacrificed for similicity as long as its under about 10ms

from gp2040.