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.

My $35 server works harder than some PCs.

We may receive a commission on purchases made from links. When it comes to DIY tech, the Raspberry Pi is one of the most recognizable products out there. It's been around for more than a decade now, ...