Arduino Relay Diode

We make a brief introduction to the relay module and build a simple project example with the arduino. The optocoupler is the most important part it isolates the circuit from the relay using light.

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1 x 1n4001 diode.

Arduino relay diode. 1 arduino 1 diode for example 1n4007 1 npn transistor for example 2n2222 in the us or bc548 in europe 1 relay for example one with coil voltage 12v and switching voltage 125vac10 a 1 multimeter. Arduino uno or any other arduino board 5v relay 1n4007 diode bc547 npn transistor red led can be used as a power on led green led can be used as a relay on led 2 x 1k ohm resistors 14 w for red and green leds lamp wires for connecting dc voltage components. It costed me about 1 usd to make one.

Arduino board jumper wires breadboard. For more info about optocouplers please check out my instructable about them at this link optocouplers. To connect a 12v relay to the arduino you need the following things.

You can even hookup your arduino or raspberry pi or else use it for any project you needed a relay module. In4001 diode generic. Putting the diode between the relay and arduino will protect us from power surges when the relay switches since the diode only allows current to flow one way.

Today i will show you how to make a diy relay module that can be used for any purpose. Here we are not using any relay driver ic like uln2003 and will only use an npn transistor to control relay. Connect the vcc and gnd pins of the relay module to the arduinos 5 volt pin.

Some relays have this protection integrated but these diode are so cheap why not add another layer of protection to our circuit. In this arduino relay control tutorial we will simply learn how to interface a relay with arduino. Guide for relay module with arduino this article shows how to control mains voltage with the arduino using a relay module.

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