ARDUINO RELAY SERIES

You will probably need this setup for systems which by default have to be OFF and you would like to turn ON when needed. Electrical flow is now possible (the system wired through these two pins is now ON).

When the relay is energized, the flexible contact moves to form a contac with the Normally Opened pin connecting the circuit. On the left Normally Opened pin -> Common pin setup, on the right Normally Closed pin -> Common pin setup.Ĭommon pin => Normally Opened pin: In this scenario, when the relay is in the OFF state, we have an interruption in the circuit, an electrical current can not flow through (a system wired through these two pins is OFF). Relay module from the front.ĭepending on you use case you will either go with a Normally Opened pin => Common pin setup, or a Common pin => Normally Closed pin setup.

On the top side you can see that each of the relays features three pins, the Normally Opened pin followed by the Common pin (the one which connects to the flexible contact moved by the magnetic coil) and on the third spot you can find the Normally Closed pin. Numbered signal pins of the 8 channel relay module on the left, JD-VCC pins connected by a jumper on the right.

ARDUINO RELAY SERIES

On the lower end of the module you see a series of pins through which each of the relays can be addressed, followed by three additional pins to the bottom right corner (thees are used if you want to achieve electrical isolation in your system, but more on this later). The Relays contain a magnetic coil which, if triggered by an electric flow (magnetic field is generated), will move a flexible contact to either create a fully connected circuit through which an electrical current can flow or interrupt a circuit, fulfilling the functionality of a switch. As you can see in the picture below an 8 channel relay module is pretty easily identifiable by, well, its 8 relays (blue cubes). One type of such a module is the 8-channel relay module. Photo by Tim Mossholder / Unsplash The Board I take no responsibility for any of your actions and damage done to you, objects or others. If you feel insecure about your actions at any point in time you should stop and consult with a specialist. High Voltage Warningīefore you continue keep in mind that the use of High Voltage, if done incorrectly or improperly could result in serious injuries or death. From left to right: single channel, 4 channels and 8 channels relay modules.

Arduino relay