Get close enough to this raven and you’ll set off the PIR sensor, which triggers lighting ... This bird’s brain is an Arduino Nano, which is protected from the 12V supply with a boost converter.

There’s a huge market for 433 MHz alarm system hardware out there, from PIR motion detectors to door and window sensors. If you want to put them to work, all you need is a receiver, a network ...

Arduino systems, when compared to Raspberry Pi, are much more straightforward to work with ... think pushbuttons and PIR motion sensors — or analog (sends a range of data) — think temperature ...