[Harvs] hacked a cheap PID controller he found on eBay to improve ... this meant the controller was assuming the cold junction was at room temperature, and would in many cases be significantly ...

The same analog sensors are also used for PID closed-loop control, but in a more complex strategy. In on-off, closed-loop control of room temperature, for example, a heat or cooling cycle is triggered ...

It plugged into the wall, and had no way to adjust the temperature ... and attached everything to an off-the-shelf industrial PID controller. Not one to trust that everything was working ...

Researchers reveal how polaritons, hybrid light-matter particles, can be controlled at room temperature using electric fields ...