What's a PID?
PID stands for Proportional-Integral-Derivative.
A PID controller uses a algorithm to determine the best way to control a process.
They are used in a wide range of industrial applications but in our case, it usually controls temperature
A traditional espresso machine uses a thermostat which once it hits a desired temperature turns off the heating element.
Below is a example of a Arduino-based PID temperature controller for a La Pavoni espresso machine.
These old machines don't have thermostats. Temp surfing is their forte.
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