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
Arduino Projects
Sensirion SCD41 and SCD40 CO2 Sensors
This CO2, temperature and humidity sensor is much more than just a pretty face on a slim body...
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
Adding battery charger to ESP8266 and ESP32 (well done)
Learn how to add a rechargeable battery to your project, easily and safely.
Active or passive buzzer for Arduino, ESP8266, NodeMCU, ESP32, etc.
Everything you need to know about connecting a buzzer to a NodeMCU, ESP8266 or Arduino
Connecting a BME280 sensor to ESPEasy
Temperature, humidity and atmospheric pressure easily and accurately.
Power from NodeMCU, Wemos Mini D1 and Arduino
What do we need to consider when powering external sensors and actuators?
Easily connect an SSD1306 OLED display (or two) to ESPEasy
Using an OLED display with ESP Easy is very easy. Here are the step-by-step instructions with video
VTX FPV video transmitter control with Arduino
Do you want to control a VTX video transmitter with an Arduino? Here's how to do it.