Using a DPDT 9v relay to control 2 LEDs.

Arduino & Electronics Leave a comment

The breadboard circuit, which consist of:

  • 9v battery
  • 2 led, red and green
  • DPDT 9V relay, this relay is reverse polarity for the coil
  • 330 ohm resistor
  • Tactile switch
  • Breadboard
  • Jumper wires
Green LED connected to Normally Close(NC), red LED connected to Normally Open(NO). Coil not energised.
Coil is energised when switch is pressed. Red LED connected and lighted up.

A short clip to demo everything:

Below is datasheet for the relay. Note that the relay model number has a letter ‘R’ at the back, which means the coil polarity is reverse as compared to the schematic diagram below.