Sensirion SCD30 dual-channel NDIR CO2 Sensor
One of the best options. In some cases it is even the only recommended option.
Projects with Arduino
In this section you can find articles related to Arduino, ESP8266, NodeMCU, etc.
CO2 meter on your mobile phone with ESP32 and Sensirion SCD30 sensor [BASIC VERSION] [BASIC VERSION].
CO2 meter with App for Android and iOS, via Bluetooth, official from the sensor manufacturer Sensirion
Sensirion SCD41 and SCD40 CO2 Sensors
This CO2, temperature and humidity sensor is much more than just a pretty face on a slim body...
Design of an ultra-low consumption CO2 meter
Ultra low power consumption meter with NDIR sensor and e-Ink display. Its design.
Experiments with ESPEasy (ESP8266) and low power - v3.0
Getting a low power consumption of our ESP8266 to use it on battery is the goal we want to achieve, and in this article we are going to continue the experiments.
Experiments with ESPEasy (ESP8266) and low power - v2.0
Getting a low power consumption of our ESP8266 to use it on battery is the goal we want to achieve, and in this article we are going to continue the experiments.
ESPEasy and deep sleep mode (ESP8266 low power consumption)
Learn how to reduce consumption by mastering ESPEasy's deep sleep mode.
Experiments with ESPEasy (ESP8266) and low power - v1.0
Do you want to reduce the power consumption of your project with ESPEasy and an ESP8266 easily so that you can run it on batteries for months? Read on. In this series of articles, of which this is the first one, I will be telling you about the progress I am making and how you can also make them and apply them in your project.... Read more
Using a ModeMCU as a voltmeter
Contents1 Measuring volts with an ESP82662 What, what is an Analogue to Digital Converter (or ADC)?3 The ESP8266 ADC3.1 What does it mean that the ADC is 10bit?3.2 What does it mean that the ADC is 1 volt maximum?3.3 What if we want to measure voltages of more than 1 volt?3.4 Limitations of the ESP826 ADC64 ... Read more
CO₂ Meter with MQ-135 sensor (Don't miss it, it's not what it looks like)
In this article I am going to tell you what you have to do to mount a CO2 meter with a 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 a MQ-135 sensor and ... Read more