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eCO2, humidity & temperature sensor

A eCO2, humidity & temperature sensors on an esp8266

grgory-paulGrégory Paul
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That project shows eCO2, temperature & humidity value on an OLED screen. The sensor can, optionally, post data to an influxdb server via wifi. You can then use grafana to « graph » the values over time.

I’ve built a eCO2, humidity & temperature sensor.

Inspiration is from http://lafabrique.centralesupelec.fr/projetco2/ project, to help ventilate classrooms when eCO2 is too high (and so, indirectly can help to limit COVID-19).

It uses an esp8266, a SGP30 eCO2 sensor and a DHT11 for humidity & temperature.

A high CO2 concentration means you should ventilate the room (and so, indirectly can help to limit COVID-19 indoors).

SPG30 doesn’t detect CO2 but can make a « equivalent CO2 » (not great but sensor is cheap, about 10 €).

It displays value on an OLED screen but can also send metric to an influxdb database,  and be displayed on a grafana dashboard.

You can find the [code on github](https://github.com/paulgreg/co2-sensor).

  • 1 × Wemos D1 Mini ESP8266 like https://www.ebay.fr/itm/Wholesale-D1-Mini-NodeMcu-4M-bytes-Lua-WIFI-Development-Board-ESP8266-by-WeMos/312200415525?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
  • 1 × SGP30 Air Quality Sensor CO2 https://www.ebay.fr/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=SGP30+co2&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=SGP30+co2+sensor
  • 1 × Temperature and Relative Humidity Sensor DHT11 https://www.amazon.fr/ELEGOO-dht11-tempreature-Humidity-capteur-Module/dp/B07JD3FKMX
  • 1 × 0.96" I2C IIC Serial 128*64 OLED LCD Screen https://www.ebay.fr/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=oled+i2c+screen+0.96+128*64&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=oled+i2c+screen+0.96
  • 1 × Adafruit Perma-Proto Quarter-sized Breadboard PCB https://www.adafruit.com/product/589

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