There is a calibration pin which you can connect to GND for 4-8s to force a manual calibration (if you can bring the sensor into an environment of ~400ppm): htt

There is a calibration pin which you can connect to GND for 4-8s to force a manual calibration (if you can bring the sensor into an environment of ~400ppm): https://emariete.com/en/meter-co2-esp8266-nodemcu-sensor-senseair-s8/ https://emariete.com/en/meter-co2-esp8266-nodemcu-sensor-sen...