I finally succumbed and bought a Raspberry Pi. I'd been holding out for quite a while, I had a ARM based NAS box (NAS4220) that I had bought a few years back with the intention of learning a bit more about Linux on ARM and as that was the only real reason I could think of for buying it, I didn't feel the need. A need did however finally present it's self, I wanted a small device to use to do some simple temperature logging. The Pi with a custom expansion board seemed like a fun way to get there and I could have fun doing some hardware development along the way with my etch tank. The requirements would be (fairly) simple:
- An I2C temperature sensor.
- An I2C battery backed Real Time Clock (to make logging data worthwhile, the Pi lacks a proper RTC).
- A transceiver for the serial port (not strictly needed for the scenario in mind, but would make the expansion board more useful).