When using the LM35 with a single supply voltage, the temperature measurement range is limited to 2☌ to 150☌ which is adequate for most applications. The device can be left open air for measuring air temps or it can be glued or cemented to an object that you want to measure the temperature of such as a heat sink. Connect GND pin to ground, Vs pin to 5V (or anything between 4 – 20V) and Vout pin to an analog pin on the uC. Since the voltage output range of the sensor is limited to 1.5V, if a greater resolution is desired, the analog reference voltage on the uC can be changed from the default 5V to something closer to 1.5V which will decrease the voltage step size on the analog readings. The output is a linear voltage that corresponds to 10.0mV/☌, so the output is directly readable in degrees Celsius using an analog port on a uC. The LM35 is a 3-pin analog thermometer packaged in a TO-92 package. If you have a uC like an Arduino and you want to measure temperature, the LM35 is one of the more popular temperature measurement ICs to use. 3.3V uC compatible if the sensor is run off separate 4 to 20V supply. -55 to 150☌ measurement range with ☐.5☌ accuracy°.Output voltage corresponds to 10.0mV/☌.Provides analog output directly readable in degrees Celsius.KEY FEATURES OF LM35 ANALOG TEMPERATURE SENSOR: The LM35 Analog Temperature Sensor is a popular option for temperature sensing over the range of -55 to 150☌.
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