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.

Intended to be a do-everything “poor man’s hardware hacking tool” as [Arun] claims, his instruction manual details all the ways that a Raspberry Pi can communicate with other devices using SPI and I2C ...

Squeezed inside the tin is a Raspberry Pi Zero W paired with a Waveshare UPS HAT and a 3.7 V LiPo battery, allowing the machine to operate untethered. A 2-inch IPS LCD provides the display, though ...