AVR LCD Thermometer by LM35

The LM35 of National Semiconductors that is used in this project is a precision centigrade temperature sensor, which has an analog output voltage. It has a range of -55ÂºC to +150ÂºC and a accuracy of Â±0.5ÂºC . The output voltage is 10mV/ÂºC . The output voltage is converted by the AD convertor of the AT Mega8. The temperature is displayed on an LCD module. In this example the thermometer has a range of 0ÂºC to 40ÂºC and a resolution of 0.5ÂºC. If you want to have a readout in Fahrenheit you can use the LM34.

Read More Source:
http://www.avrprojects.net/articles.php?lng=en&pg=62
http://electronics-diy.com
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