If you just want to light up a lamp occasionally, it is better to use a normally-open circuit configuration. NO (Normally Open): the normally open configuration works the other way around: the relay is always open, so the circuit is broken unless you send a signal from the Arduino to close the circuit.NC (Normally Closed): the normally closed configuration is used when you want the relay to be closed by default, meaning the current is flowing unless you send a signal from the Arduino to the relay module to open the circuit and stop the current.The high-voltage side has two connectors, each with three sockets: common (COM), normally closed (NC), and normally open (NO). The six pins on the left side of the relay module connect high voltage, and the pins on the right side connect the component that requires low voltage-the Arduino pins. The following figure shows the relay module pinout. There are other relay modules that are powered using 3.3V, which is ideal for ESP32, ESP8266, and other microcontrollers. This module should be powered with 5V, which is appropriate to use with an Arduino. There are other models with one, four and eight channels. This relay module has two channels (those blue cubes). Introducing the Relay ModuleĪ relay is an electrically operated switch that can be turned on or off, letting the current go through or not, and can be controlled with low voltages, like the 5V provided by the Arduino pins.Ĭontrolling a relay module with the Arduino is as simple as controlling any other output as we’ll see later on. The example we’ll build shows how to control a relay module with an Arduino and a PIR motion sensor.īy the end of this tutorial, you should be able to control any electronics appliances with your Arduino using a relay module. We make a brief introduction to the relay module and build a simple project example with the Arduino. Here is a simple street light controller with a switching circuit that overcomes the problems of false triggering and no switching capability.This article shows how to control mains voltage with the Arduino using a relay module. This project is available at Street Light Controller 41. Here is a simple street light controller with a switching circuit that overcomes these problems. Two of the problems commonly associated with street lights are false triggering due to slight variations in the intensity of ambient light and no control over switching action. This project is available at USB MP3 Player 40. The module comes with a remote for your convenience… In this article, you will find instructions to assemble a USB MP3 module and make a USB MP3 player. This project is available at Multimeter Test Leads from Scratch 39. These homemade test leads are low-cost and easy to use. Multimeter Test Leads from Scratchīuild your own multimeter test leads from material available in the market. This project is available at How To Make A Business Card Flashlight 38. The essence of this project is that anyone can make it at home without any soldering or PCB. Here we make a business card useful and unique by turning it into a business card flashlight. This project is available at Smart Battery protector 37. Built around a PIC microcontroller, this is just something we would all love in competitions as well. This one would be the one for students to design and implement in college competitions. This mini project is available at Hand Video Game 26. Let’s get to designing the once-popular game using electronics. This next project is a throwback to the time when we enjoyed it. This mini project is available at Simple Line-Following Robot 25. It lays the foundation for building your own behavior-based (simulated) robot. It is a simple project, which can be taken up as a classroom assignment. This robot follows a color with the help of sensors. This mini project is available at Sixth-Sense Media Player 24. It requires Windows Media Player, LabVIEW, Arduino, and an accelerometer. This project explains how to control the media player using a hand glove. This mini project is available at Water Pump Controller 23. The purpose of this circuit is to create a new topology with a good power factor maintained at AC voltage input, to provide good efficiency output to the battery, and to increase its life.
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