is used to sense the temperature & 10K variable resistor is used to select the required temperature range. Experimenting with different values of thermistor and variable resistor will also help in achieving accurate required temperature range.
The circuit is using 10 LEDs to show visual indication of temperature, the point marked "IC Connection" is the temperature selection point to activate the relay switch on required temperature, it can be connected with any pin of the IC that is connected with LED. Operating voltage of the circuit is 5V to 12V.
This article describes a project of LED thermometer with selectable temperature switch. The circuit can be adjusted for any temperature range; a relay switch is used at the output of the circuit that will become activated on any selected temperature, the 10K NTC thermistor
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