Reading Temperature with Starter AVR Revision as of 18:59, 5 April 2016 by Vaibhav Katkar (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

In this tutorial we will set up and read the temperature from LM35 using ADC of Atmega32 from Starter AVR board.

Basic

Initially we will read a raw data from ADC. Atmega32 comes with 10-bit 8-channel inbuilt ADC. We will connect 10k Pot to channel 0, vary it and read the raw voltage. After that we will connect the LM35 temperature sensor to channel 0 and read the temperature as shown in hook up. We will display the converted value on terminal.
Refer Reading Temperature with AVR ADC for basics of Atmega32 ADC and LM35 temperature sensor.

Hookup

Instead of LM35 temperature we can use on board pot to read the raw data from ADC.

Code to Read Voltage

This code is for reading a raw data from a ADC0 pot on board, which is connected to PA0

Code to Read Temperature

This code is to read data from LM35, connected to PA1.

Demo

To display the ADC value open the terminal connect the COM port, we will get output as shown in below image.