Controller design
Another evening well spent :) I designed a controller for my oven. It has connectors for four thermocouples and six relays, a buzzer and an I2C interface. The mandatory ICSP and FTDI headers are present as well of course. I'll probably have to make a few adjustments and tweaks here and there, but the overall layout is okay I guess. It still lacks a 3.3V regulator and logic level converter for 3.3V I2C devices.The board measures 59 x 42.5 mm (2.325" x 1.675"). It'll cost about $20 per board I reckon. Add a few bucks for the thermocouples, about $10 per relay, $10 for an LCD and keypad and all that's left is a power supply :)
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