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. Flyback Diode Wikipedia Arduino Relay Lamp Super How To Make Own Relay Module For Arduino Aabc Tech 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 ...
