I'm currently working on a project where I need to control a 12V DC Siren (link to product: https://amzn.to/44rHsi7) using my Raspberry Pi's GPIO pins. I want to be able to play and pause the siren programmatically through my Raspberry Pi.

I've done some research, but I'm not entirely sure about the correct approach and the components needed for this setup. Can anyone provide guidance on how to properly connect and control the 12V DC Siren with Raspberry Pi GPIO? Additionally, I'd appreciate any tips on the programming side to implement the play/pause functionality.

Any help, suggestions, or sample code would be highly appreciated. Thank you in advance!

  • There are a gazillion examples of using a Pi to control a load of whatever voltage/current. What have you tried?
    – Milliways
    Commented May 6 at 12:03
  • I am a newbie, I directly connected siren with jumper wires but GPIO supports 3.3V and siren is 12V and it didn't work obviously. Commented May 6 at 12:25

2 Answers 2


The minimum circuit is here https://www.circuitlab.com/circuit/v5jv3m/raspberry-pi-buzzer-output/ . You need a transistor active as a switch, being activated by a Pi pin through a resistor.

You can then safely supply the siren with your voltage.

  • FWIW: Your answer would be better if you included a schematic. Also, please see the policy for "link-only answers".
    – Seamus
    Commented May 6 at 17:48
  • Hi there, Thanks for this information. It really helped me to understand the circuit. Since i am a newbie, it would be helpful if you let me know what configuration of resistor and transistor is required for a 12V DC siren? (amzn.to/44rHsi7) Commented May 6 at 20:18
  • For a small siren a BC548 would do, bigger ones would use a TIP120. The gate resistor would be around 100R maybe, but that depends on the transistors gain
    – user146487
    Commented May 7 at 18:10

The Pi has not enough Power (Voltage AND Current) to drive this Siren. You have to bypass the Power from an external 12 V DC Power Supply. Then, on the second hand, you have to Connect the Pi with the Siren with a galvanic isolation. You can reach this with a relais: https://amzn.in/d/5OXuk0p At first, try to activate the relais, and then you can reach for the next Target. Take care for your ears, this Sirens can be realy loud, if they`re spotted to your face.

  • the relay would also require a driver circuit, same as the siren
    – jsotola
    Commented May 6 at 16:30
  • The Relay which I linked, has a built in Driver for the optocouppler. With this Board you have a Led which indicates you, if your GPIO is High or Low. I realy think it is important for a beginner to start with a galvanic isolation.
    – Bastian
    Commented May 7 at 10:45
  • then it is not a relay, it is a relay module
    – jsotola
    Commented May 7 at 16:12

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