A relay is commonly used to interface a low-current circuit to a higher-current circuit. As such, it’s very useful in controlling appliances and other mains-powered devices using microcontrollers. In this Arduino relay tutorial, I will show you how to use a relay with microcontrollers.

The MQ-7 carbon monoxide gas sensor is especially designed to be sensitive to carbon monoxide (CO) gas which is emitted by vehicles, factories, etc. Since this gas is considered toxic to humans at certain levels, the concentration of CO is used to determine the air pollution in a given area.

Project Overview This adjustable timer displays seconds, minutes, and hours and is powered by a PIC16F 877A microcontroller. There are five buttons included: start/stop, up for incrementing digits, down for decrementing digits, and left and right for moving between digits during adjustment. I’ve included a relay circuit that will trigger …

A fire or flame sensor is simply an infrared LED with an amplifier circuit. Flame radiates an infrared signal, which triggers the LED to produce current. This current is converted to voltage for an analog-to-digital converter to read. Let's see how we can build an Arduino fire detector using this …

The Nokia 3310 LCD is a cheap option for those who want to add a graphical display to their microcontroller projects. This digital thermometer project uses this LCD to display the temperature from a LM35 temperature sensor.

This project is a stepper motor controller featuring the PIC16F877A microcontroller and coded using XC8. The controller has three control buttons: start, stop, forward and reverse. The project was created with a six-wire unipolar stepper motor in mind but may work with other stepper motors with some modifications.

The Raspberry Pi Zero W comes with both WiFi and Bluetooth connectivity. I have already covered how to turn on WiFi on my previous tutorial. Now, let’s look at how to set up a Raspberry Pi Zero bluetooth connection without a GUI.

A water level sensor is a simple device used to measure the level and volume of water inside a container. This tutorial shows you how to use a water level sensor with microcontrollers like an Arduino or PIC.

LoRa is a promising low-power, long-range wireless transmission protocol developed by Semtech as part of the emergence of the Internet of Things (IoT). Simply put, it is a method for sending data separate from WiFi, Zigbee, or Bluetooth. Its low power consumption amidst a very long range of transmission (up …

The number of Arduino boards have increased over the years; some have been discontinued while others are still available. The choice of which board to use depends on several factors: price, features, availability, ease of use, etc. Here’s a summary of all Arduino boards with their pros and cons.