Arduino PID Controller ShieldThis easy-to-make shield converts your Arduino into a full-featured PID controller.
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A PID controller is like a kind of fancy thermostat, but can be used to control pretty much any kind of process, not just heating and cooling. The Arduino PID Controller Shield was inspired by the osPID (open source PID). Although intended as a DIY project it is a capable device. With the addition of an SSR module and suitable heating, the stripboard PID shield could be used directly in applications such as sous vide food preparation, brewing, and reflow soldering.