Arduino with TDS Sensor (Water Quality Sensor)
In this guide, you’ll learn how to use a TDS meter (Total Dissolved Solids) with an Arduino board. A TDS meter indicates the total dissolved solids like salts, minerals, and …
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ESP8266 NodeMCU with TDS Sensor (Water Quality Sensor)
In this guide, you’ll learn how to use a TDS meter (Total Dissolved Solids) with an ESP8266 NodeMCU board. A TDS meter indicates the total dissolved solids like salts, minerals, …
ESP8266 NodeMCU: K-Type Thermocouple with MAX6675 Amplifier
In this guide, you’ll learn how to read temperature using a K-Type Thermocouple with the MAX6675 amplifier with the ESP8266 NodeMCU board. A K-type thermocouple is a type of temperature …
Arduino with BH1750 Ambient Light Sensor
The BH1750 is a 16-bit ambient light sensor. In this guide, you’ll learn how to use the BH1750 ambient light sensor with the Arduino board. The sensor communicates with a …
ESP8266 NodeMCU with BH1750 Ambient Light Sensor
The BH1750 is a 16-bit ambient light sensor. In this guide, you’ll learn how to use the BH1750 ambient light sensor with the ESP8266 NodeMCU board using Arduino IDE. The …
ESP8266 NodeMCU: Create a Wi-Fi Manager (AsyncWebServer library)
In this guide, you’ll create and set up a Wi-Fi Manager with the ESPAsyncWebServer library that you can modify to use with your web server projects or with any project …
[SOLVED] Could not find a valid BME280 sensor, check wiring!
This is a troubleshooting guide for the BME280 temperature, humidity, and pressure sensor when using ESP32, ESP8266, Arduino, or similar boards. If you get an error message in your Serial …
Year in Review 2021 – Random Nerd Tutorials
We’re reaching the end of 2021. As usual, at the end of the year, we share a summary of what happened throughout the current year on the Random Nerd Tutorials …
What is MQTT and How It Works
In this article, we’re going to introduce you to the MQTT protocol. MQTT stands for Message Queuing Telemetry Transport.
Testing Mosquitto Broker and Client on Raspberry Pi
In this tutorial, you’re going to test the Mosquitto MQTT Broker and MQTT Client on a Raspberry Pi. You’ll subscribe the MQTT client to an MQTT topic and publish sample messages. …
ESP8266 NodeMCU Web Server: Display Sensor Readings in Gauges
Learn how to build a web server with the ESP8266 NodeMCU to display sensor readings in gauges. As an example, we’ll display temperature and humidity from a BME280 sensor in …
ESP8266 NodeMCU Door Status Monitor with Telegram Notifications
In this project, you’re going to monitor the status of a door using an ESP8266 NodeMCU board and a magnetic reed switch. You’ll receive a message in your Telegram account whenever the door …
ESP8266 NodeMCU Web Server: Control Stepper Motor (WebSocket)
In this guide, you’ll learn how to create a web server with the ESP8266 NodeMCU board that displays a web page to control a stepper motor. The web page allows …
ESP8266 NodeMCU Door Status Monitor with Email Notifications (IFTTT)
In this project, you’re going to monitor the status of a door using an ESP8266 NodeMCU board and a magnetic reed switch. You’ll receive an email notification whenever the door changes state: opened …