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hanez.org · ArduinoCurated

Switching mains voltage with Arduino and relays

Summary

Johannes Findeisen shows a small relay setup that periodically switches a mains line using the Arduino Blink example. The setup switches on and off for ten seconds each. An Arduino serves as the controller.

Ideas

  • A digital output can drive a relay through a suitable driver stage.
  • The Blink example is a simple functional test for timed switching.
  • Relays galvanically isolate the control logic from the switched circuit.

Insights

  • A minimal software example can quickly make real hardware testable.
  • Mains voltage turns a simple Arduino experiment into a safety-critical project.

Facts

  • The article documents the visible on and off states.

Recommendations

  • Use touch-safe enclosures, a fuse and sufficient clearances between conductors.
  • Test the logic with harmless extra-low voltage only at first.

References

Read the original article on hanez.org

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