I have a Roland TD-11 electronic drum set. I’d like to trigger the axoloti to play a sample when I hit the rim trigger.
I will have a trs to trs breakout box with the ring(rim trigger) tapped into the axoloti.
Will this damage the brain of the TD-11 of the axoloti?
Not too familiar with electronic drum kits, but like normal, with anything you connect to the Axoloti, if the voltage is not right, you could damage it.
If connected to a GPIO, the voltage must not exceed 3.3v, if connected to the midi din, must not exceed 5v.
Maybe the best place to start is to find out what sort of signal is coming out of the TD-11, is it just a rising edge when the rim is hit ?
Why not use MIDI out of the TD-11 into MIDI IN on the axoloti? A bit overkill for one trigger, but definitely the most plug-and-play solution.
The Gate/trigger output of the TD-11 will most definitely be too high to use directly with the Axo. I can think of no synthesizers out there that can even respond to the 3.3V level the Axo uses so would really doubt the TD-11 outputs a signal that low. Their are many easy ways to make it safe to use, a simple transistor acting like a switch passing the 3.3v when the gate goes high would be easy to make and very cheap. I think that chawps has the safest answer though. Just use the NIDI out of the TD-11 if it has one. Then you can use multiple triggers doing other things too, not to mention dynamics and other properties if available.
I think midi is my best option. I’m going to have a few samples hooked to different pads.
Wire-wise, midi will be much cleaner too.
A small extra circuit could do the trick.
This little board will convert from 5V to 3.3V: https://www.sparkfun.com/products/12009
Maybe even combine that with a LM7805 which will step the incoming voltage down to 5V.