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.

More often than not, an IoT master device uses the SPI (serial peripheral interface) and I 2 C (inter-integrated circuit) protocols to exchange data with EEPROMs or sensors that are operating in slave ...

Sammy is a computing, Raspberry Pi, 3D printing, 3D scanning, and 3D modeling author. He has contributed articles on various websites, including Makeuseof, Tomshardware, All3dp, 3Dsourced, and several ...