Remote control for projectro screen on an Attiny 24. Reacts on remote control signal from Epson EMP-TW600 projector.
- Remote control ON button brings screen down (so when the projector is switched on, screen comes down)
- OFF button brings screen up (projector off, screen up)
Also, the ON button in fact toggles the screen - that way it is possible to move up the screen while the projector stays on (in my case, the screen covers a sliding door, so that is convenient :) )
- IR-receiver (some common TSOP38 or similar)
- rotation detector of an encoder wheel via reflective optical sensor (CNY70) (via "software defined" Schmitt-Trigger input: using a comparator and a digital output to bias that).
- end-switch
- motor driver in h-bridge configuration (754410 or similar)
- bias-output for CNY70 Schmitt-Trigger input.
- status LED
The encoder wheel is written in PostScript https://github.com/hzeller/postscript-hacks/blob/master/encoder-wheel.ps
Here a (bad quality recorded) example: https://www.youtube.com/watch?v=lvHZYmplDkQ
There is no PCB or something, just directly raster-boarded; the screen is a IKEA Tupplur blind.