A Raspberry Pi, object detection camera, and servo-triggered taser sit inside a 3D-printed spiked shell, and the creator says ...
The over-the-top contraption features a taser and a camera.
While the Raspberry Pi has very good support for an I2C bus, a lot of very cool chips – including the in system programmer for just about every ATtiny and ATmega microcontroller – use an SPI bus.