Toss in a few solid sate relays (SSR) and a K-Type Thermocouple, like the ones Adafruit has here, and your good to go. I like the idea of a standalone PID controller as it’s one less PC controlled device to worry about.
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That’s interesting. I wouldn’t mind building a one off.
This is pretty handy! We’ve come up with a similar concept for sous vide cooking, which in fact would work pretty well for a solder reflow oven. The kit is $80, but includes SSR, heatsink, enclosure and ATMega with Arduino bootloader. We’re limited to 10 A (1200 W), though it could be pushed to 25 A if a fan is used to circulate air. Check it out! http://lowereastkitchen.com . We’ve had some classes at NYC hackerspaces (you can see them at our blog http://qandabe.com )