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This code allows an Arduino to work like a PID controller. It uses a MAX6675 with K type thermocouple to turn a heat source (hotplate), to maintain a constant temperature.
This version uses a Adafruit SSD1306 OLED for visual output.
3 inputs are used, temp scale (C/F/K), target temperature up, and target temperature down. Those are simple momentary contact buttons to ground, on 3 analog pins.
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