6 layers84 × 50 mm

Solar ribbit
Ribbit-Network/ribbit-network-frog-hardware
The sensor for the world's largest crowdsourced network of open-source, low-cost, GHG Gas Detection Sensors.
171 parts107MIT
KiCad boards from 1 GitHub repository tagged “co2-sensors”, the most starred first; open any of them in PCBKit.

Ribbit-Network/ribbit-network-frog-hardware
The sensor for the world's largest crowdsourced network of open-source, low-cost, GHG Gas Detection Sensors.