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by rthomas6 896 days ago
You could do it all with discrete chips on a board. No need for a computer really. Temperature -> PID controller, display -> 7 segment decoder, timer -> timer chip.

Something like a circuit board with a bunch of discretes would be how I would expect an oven from 25 years ago to look. Maybe there's a microcontroller to coordinate things, but I think you could get by without it