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avr-ds18b20 is an AVR library for controlling DS18B20 temperature sensors. It can be easily compiled for every micro-controller supported by avr-gcc.

Usage example

#include <avr/io.h>
#include <util/delay.h>
#include <stdio.h>

#include <ds18b20/ds18b20.h>

int main( )
	int temp;

	while ( 1 )
		//Start conversion (without ROM matching)
		ds18b20convert( &PORTB, &DDRB, &PINB, ( 1 << 0 ), NULL );

		//Delay (sensor needs time to perform conversion)
		_delay_ms( 1000 );

		//Read temperature (without ROM matching)
		ds18b20read( &PORTB, &DDRB, &PINB, ( 1 << 0 ), NULL, &temp );

		//Somehow use data stored in `temp` variable

	return 0;

For more information visit wiki.