Happy Pi Day! Isn't Pi Day one of the best holidays all year? For last year's Pi Day, I determined a value of pi without even using a circle. How can you top that? I can top it by using pi to find pi.
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.
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