![]() But when we will activate the relay module, then it will get connected to the COM and will supply power to the load, which will power up the light. In normally open connection, there will be no contact between COM and NO, since it is normally open. ![]() NO (Normally open): This act like a switch.COM (Common connection): The COM is the center terminal of the relay and it is used in both (Normally open and normally closed) connections.you may also like to read Xbee interfacing with arduinoīefore getting into the output connections of the relay, we have to understand the NO, COM and NC connections. ![]() You can also power the 4 relay module using the external power by giving voltage from 5 to 24V DC.Logic VCC: This will be connected to the 5v pin of the Arduino o power the 4 relay module.Input4 (IN 4): This will be connected to the digital pin on your Arduino, or leave it unconnected if you do not want to use this channel.Input3 (IN 3): This will be connected to the digital pin on your Arduino, or leave it unconnected if you do not want to use this channel.Input2 (IN 2): This will be connected to the digital pin on your Arduino, or leave it unconnected if you do not want to use this channel.Input 1 (IN 1): This will be connected to digital pin on your Arduino, or leave it unconnected if Logic GND: This will be connected to GND on your Arduino.I recommend you to learn how to use digital output of arduino microcontroller.Relay Module Pinout Input Connections of relay module Once you will understand this then you can use all other types. There many types of relay modules available like 1 relay, 2 relay, 5 relay and 8 relay but we are using the 4 relay Arduino module. you should also read getting started projects of arduino. This is why we can control a 220V appliance by simply controlling it using the 5V Arduino. The part which powers the relay module is completely isolated from the part which turns ON or OFF. ![]() When the electricity is provided to the relay coil then it acts like a magnet and changes the state of the switch. Relays works on the principle of electromagnetism. A relay can be used to control high voltage electronic devices such as motors and as well as low voltage electronic devices such as a light bulb or a fan. A relay is basically a switch which is operated electrically by electromagnet. Relay module for Arduino is one of the most powerful application for Arduinoas it can be used to control both A.C and D.C devices by simply controlling the relay by giving 5V. ![]()
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