Thursday, February 2, 2023

Temperature Controlled Switch

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This simple temperature controlled circuit triggers automatically when the ambient temperature goes beyond a set limit of, say, 50 degrees centigrade. This temperature setting can be changed as per requirement through the potentiometer in the circuit.

The circuit has three parts: the sensor, main control unit, and relay driver. It works on 230V AC mains. A bulb used in the circuit acts as a load for demonstration purpose. When the room temperature goes beyond the set limit the bulb switches on automatically. The author’s prototype is shown in Fig. 1.

Fig. 1: Author’s prototype on a breadboard
Fig. 1: Author’s prototype on a breadboard

Download PCB and Component Layout PDFs: click here

This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s January 2023 Issue–print or ezine edition.

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