[sdiy] Very cheap SPI pressure sensors.. anybody ??

[Ingo Debus]

> Am 19.03.2021 um 23:06 schrieb Didrik Madheden <nitro2k01 at gmail.com>:
> 
> So that gives me a different idea for a working principle based on
> light: reflection. No hole=light reflects back. Only one side of the
> paper has electronics. This could be done with either a visible LED
> (for an additional visualizer effect) or an IR LED (for
> authentic-looking operation).

That was my idea too. Would the good old CNY70 do the trick?
https://www.vishay.com/ppg?83751

But then, 90 of these will eat quite a lot of power for the infrared-LEDs…

Ingo