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23. Anslutning av en relais

Supply power to the relais:

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Connect an LED to the relais:

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Does the LED light up. Why?

Connect the GND of the Arduino with the IN1 of the relay board. Does the LED light up? Why`

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Yes, the LED should light up.

Build the following schematic. It is called an H bridge. It has two LEDs in opposite directions. All four pins of the relais can now be used.

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  • Which two pins need to be connected to GND to make the blue LED light up?
  • Which two pins need to be connected to GND to make the green LED light up?

Exam:

  • Explain on the drawing how the H bridge works
  • Build the H bridge
  • Light up the blue LED
  • Light up the green LED