Co2 detecting and display in an outlet with an OLED. timv1 in the Adafruit customer support forums writes-
Concerning the monitoring of the CO2 I’ll share an idea for displaying it.
Wanted to keep it all inside an outlet that could be used to power a solenoid connected to the CO2 tank. Due to space limitations I decided on using a little OLED… A place like OshPark can make you up a board SUPER inexpensive if you’re interested in such things. Anyhow, here are some pictures of the what I did to get the little OLED into the outlet.