This interesting DIY thermometer project uses an Arduino Uno board and LM35 temperature sensor to display current ambient temperature on a 16x2 LCD screen attached with Arduino. This block diagram shows the working of this project.
LM35 temperature sensor is used for sensing environment temperature which gives 1 degree temperature on every 10mV change at its output pin. You can easily check it with voltmeter by connecting Vcc at pin 1 and Ground at pin 3 and output voltage at pin 2 of LM35 sensor. For an example if the output voltage of LM35 sensor is 250m volt, that means the temperature is around 25 degree Celsius.
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