After some time waiting for my PCB (got it via dirty pcbs) I was able to start the first project: a simple temperature controler.
A connected DS18B20 sensor determines the temperature and the microcontroler controls an external relais and subsequentially a peltier element.
Currently in development is to set the processor in low power mode i.e. use interrupts and pwm for controling the relais.
Next steps are to use a 8 pole dip switch to set the target temperature (fits nice in the breakout and avoid the need of an display) and uprgrade to a MOSFET or SSR.
But it already works for keeping the coffee warm :)
If you're interested the code (code composer studio project) as well as the board layout is available at github (encountered no problems yet which makes me proud for the first eagle desing I made).
You can even order the board dircetly via:
Although I have to admit the silkscreen is not very informative and I would also flip perhaps the order for the voltage regulator.