Summary of LM35 Temperature Sensor Interfacing with ATmega32 and LED Display
Parts used in the LM35 Temperature Sensor Interfacing Project:
- LM35 series temperature sensor
- AVR ATmega32 microcontroller
- 1X8 LED array
LM35 series is a low cost and precision Integrated Circuit Temperature Sensor whose output voltage is proportional to Centigrade temperature scale. Thus LM35 has an advantage over other temperature sensors calibrated in Kelvin as the users don’t require subtraction of large constant voltage to obtain the required Centigrade temperature. It doesn’t requires any external calibration. It is produced by National Semiconductor and can operate over a -55 °C to 150 °C temperature range. Its output is linearly proportional to Centigrade Temperature Scale and it output changes by 10 mV per °C.
In this project, we will learn How to interface a LM35 temperature sensor with AVR ATmega32 microcontroller and LED display. Here, we will measure the temperature of the surrounding or any other material to which the LM35 temperature sensor is connected for its temperature measurement and we will display the temperature value in degree centigrade in 1X8 LED array. But, the output of LM35 temperature sensor is analog in nature and microcontroller cannot process the analog signal directly. So, first it will convert the analog output of LM35 temperature sensor to digital values using its analog to digital converter and then it process the digital value to convert the digital value in degree centigrade value. Then the microcontroller will display the temperature in degree centigrade in the 1X8 LED array. Now, lit a match stick or lighter near the LM35 temperature sensor and see the changes in its output value in the 1X8 LED array.
For more detail: LM35 Temperature Sensor Interfacing with ATmega32 and LED Display
- What is the primary advantage of the LM35 over sensors calibrated in Kelvin?
Users do not require subtraction of a large constant voltage to obtain the required Centigrade temperature. - Does the LM35 sensor require external calibration?
No, it does not require any external calibration. - How can the analog output of the LM35 be processed by the microcontroller?
The microcontroller converts the analog signal to digital values using its analog to digital converter before processing. - What is the relationship between the LM35 output voltage and temperature?
The output is linearly proportional to the Centigrade scale, changing by 10 mV per °C. - What is the operating temperature range of the LM35?
It can operate over a -55 °C to 150 °C temperature range. - How is the measured temperature displayed in this project?
The value is displayed in degree centigrade on a 1X8 LED array. - Can you demonstrate the sensor's reaction to heat changes?
Lit a match stick or lighter near the sensor to see changes in the output value on the LED array.
