4 layers50 × 110 mm

Boards in 2 GitHub repositories, designed in KiCad, that use the STC31-C-R3 by Sensirion (-40℃~+105℃ 2.7V~5.5V 3mA Carbon dioxide I2C Reset function ±0.2% QFN-12 Gas Sensors ROHS). See how each wires it, with its parts, size, README and files; the STC31-C-R3’s symbol, footprint and pinout are on its own page.


Holorite/SensorModuleBreakout
Sensor module PCB with breakout pins for CottonCandy