3D-printer fume extractor (two boards)

The whole appliance across TWO boards: a 12 V power board (jack → buck → fan) and a 5 V logic board (MCU, SEN55, OLED, boost button), bridged by three jumpers. PM2.5 sets the fan speed; the button boosts.

What's on the bench

• 2× Text label
• 120mm Fan
• Buck Conv
• Button
• DC Jack
• MCU
• OLED 128×64
• SEN55

This project runs prebuilt firmware on the emulated board; open it in the simulator to watch it work and inspect every part live.