formpie

geoff Jul 19.2026

0 44 Easy

A complete Raspberry Pi powered formaldehyde logger with charts, MQTT and Home Assistant integration

HARDWARE LIST

1 DFRobot Gravity: SFA40 HCHO Sensor

1 Fermion: Monochrome 0.96" 128x64 I2C/SPI OLED Display

1 Raspberry Pi Zero W

Full build guide, software and 3D printed case via docs on github: https://github.com/GeoffWilliams/formpie

License

All Rights

Reserved

Tags DFRobot Raspberry Pi IoT 3D-Printing Environment

geoff Apr 13.2026

24 M-point

1 Makelogs