Very simple text laser projector. It's main parts are: polygon mirror motor module taken from old laser printer, BLDC motor and laser diode taken from DVD, collimator for the laser, photodiode, STM32 board (Blue Pill). Article in English: https://habr.com/ru/post/438618/ Article in Russian: https://habr.com/ru/post/407591/
Details
Video of working laser protector:
Components
1×
Polygon mirror motor module
Taken from the laser printer
1×
BLDC motor taken from the DVD
Used for vertical scanning
1×
Small mirror for vertical scanning
Should be glued to BLDC motor from DVD