Ok thanks...
I'm currently scratching my head studying the Roland keybed matrix. Since I want to build the BEST 88 notes MIDI controller, I'm currently ordering a new Roland PHA III Ivory keybed (found in the V-Piano or RD700NX). The difference with Fatar (or maybe other keybeds) is that the 2 switches are not in the same position. The easiest way I can explain it is this:
Fatar = 2 switches (1 switch = note up, 1 switch = note down)
Roland = 2 switches (1 switch = note almost down, 1 switch = note down)
This mean that the IC must be REALLY fast to calculate the velocity. Does anyone have a clue on this ? What's the fastest delta (time between the 2 switches) the STM32 can compute ?
Will
Edit: You know it's a bit confusing. I don't have access to a Fatar keybed, but by looking to some pictures on the web, it looks that there's also 2 switches on the Fatar in the same position. Maybe I'm misunderstanding something...