LM35 is a precision IC temperature sensor with an output voltage linearly proportional to the Centigrade temperature. Thus for a 0 to 100 Degrees C, the sensor output will be 0 to 1V accordingly. The sensor works over a wide operating voltage from 4 to 30V with only less than 60 microAmperes current drain which makes it favorable on a battery operation.
My prototype is connected to a 9V battery and gives me a reasonable accuracy when compared to our calibrated ROTRONIC Thermometer using a type K thermocouple. A digital voltmeter is connected to the sensor to display the voltage output of the sensor. I also tried connecting the sensor into our Envitech Ultimate logger to record and monitor the room temperature in one of our AQMS station.
Another possibility is to use the sensor to trigger some devices such as relays, blowers, fans, alarm, etc. I Had a great time building several automatic blower in some of my power supplies using this LM35 sensor, have fun with it. ---73 de du1vss
