- Anything that needs high voltage needs a transistor, an optoisolator or a relay between your RPi and the load.
- Anything that is more than 3.3V needs a transistor between your RPi and the load to protect the RPi.
- You can't switch any AC directly, it needs a relay or an optoisolator.
- Anything that has AC mains electricity needs a relay between your RPi and the load and needs careful protection between you and the mains (as it can kill). If you don't understand mains don't work with mains. The relay may need a transistor between the RPi and the load for the above reasons.
Statistics: Posted by DougieLawson — Mon Jun 23, 2025 6:43 am