Generating variable voltage with Arduino, ESP8266 and ESP32
Let's see how we can generate a variable voltage with Arduino, ESP8266 and ESP32 using different techniques.
Arduino
Gateway ESPNOW to MQTT over WiFi
A Gateway that allows you to receive signals sent with ESPNOW and forward them as MQTT messages.
Radio communication for ESP8266 and ESP32 with ESPNOW
ESP-NOW is a "new" radio communications protocol supported by the ESP8266 and ESP32, developed by Espressif, its manufacturer, which allows very fast data transmissions (and when I say very fast, I mean very fast). Its main objective is to replace Wifi to allow much lower power consumption and thus greater autonomy ... Read more
CO2 Meter TFT Colour Display with TTGO T-Display Sensirion SCD30 - The CO2 Gadget
CO2 meter with colour display and Bluetooth connection. Take it with you everywhere and measure the air quality discreetly and at any time.
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
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?