This temperature meter uses an LM35 temperature sensor and Nokia 3315 LCD to measure and display temperatures from -55°C to 150°C. The LM35 sensor outputs an analog voltage proportional to the temperature, which is converted to a digital value by a PIC microcontroller and displayed on the Nokia LCD. The meter provides stable readings and can detect small temperature changes, making it useful for monitoring temperatures in various applications.

1. Nokia 3315 LCD Based Temperature Meter
Introduction
This is General purpose Temperature meter for measuring Temperature from -55 ºC to 150 ºC ..It is a very useful bench test equipment for testing and finding out the temperature of various devices with unknown temperature such as room temperature , cpucabinet, etc. The meter provides very stable readings and has excellent input sensitivity thanks to LM 35 Temperature sensor from National Semiconductor , so it can even measure small temperature change.
The LM35 is three terminal temperature sensor which gives output in the form of analog voltage. LM35 linear to the whole temperature range it generate 10 mV/ºC. this analog voltage is feed to the internal 10 bit analog to digital convertor of the PIC 18F458 which convert it into temperature and then display to the NOKIA 3315/3310 LCD.
LM35
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2. NOKIA LCD PIN OUT
Circuit / Schematic