By popular demand I have updated my temperature PID-control hack from 2010 http://www.anderswallin.net/2012/12/temperature-pid-control-part-deux/ It uses two parallel port pins, one to measure temperature from a IC555+thermistor sensor, and another to control a PWM-heater. I used it to control the temperature of a 3D printer extruder and although quite minimal (some would say naive!), it seems to work OK.
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