So I am turning a relay on and off with my Arduino. I am using python to control it but wrote the simple basic code in the Arduino IDE. I am able to send 5 or 0 volts to the pin. My question is, how can I turn something on and off that requires more than 5 volts to turn on?

Thank you.

  • you need a relay shield
    – user278
    Mar 2, 2014 at 16:02
  • Many relays are controlled w a 5v signal, yet switch 120-240 volts on the second set of contacts. Mar 9, 2014 at 0:15

1 Answer 1


Use a transistor, amplifier, opto-isolator or if you can drive a 5V relay use that relay to drive a higher voltage/current item item.

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