CO2 Meter TFT Color Display with TTGO T-Display Sensirion SCD30 - The CO2 Gadget
CO2 meter with color screen and bluetooth connection. Take it everywhere and measure air quality discreetly and at all times.
Arduino
CO2 Monitor on your cell phone with ESP32 and Sensirion SCD30 sensor [BASIC VERSION]
CO2 meter with App for Android and iOS, via Bluetooth, official of the sensor manufacturer Sensirion
CO₂ meter with MQ-135 sensor (Don't miss it, it's not what it seems)
In this article I am going to tell you what you have to do to mount a CO2 meter with an MQ-135 (sic) sensor. An easy and cheap tutorial (it's free). I hope that, if you are reading this article, it is because you have thought about building an easy and cheap meter with an MQ-135 sensor and… Read more
Battery powered CO₂ monitor (well done)
Learn how to add rechargeable battery to your project, easily and safely.
Active or passive buzzer for Arduino, ESP8266, NodeMCU, ESP32, etc
Everything you need to know to connect a buzzer to a NodeMCU, ESP8266 or Arduino
Connect a BME280 sensor to ESP Easy
Temperature, humidity and atmospheric pressure easily and with precision.
Power from NodeMCU, Wemos Mini D1 and Arduino
What must we take into account to supply external sensors and actuators?
The MH-Z19B CO2 Sensor Bible
The MH-Z19B CO2 sensor is fantastic, an inexpensive CO2 sensor, accurate for the price, and very easy to use.
In this article you will find everything you want to know about him.
Connect an SSD1306 OLED display (or two) to ESP Easy easily
Using an OLED screen with ESP Easy is very easy. Here the step-by-step instructions with video