c code with at commands to send value of sensor !!

#define F_CPU 3686400UL
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include "uart.h"
#define sbi(port, bit) (port) |= (1 << (bit))

#define  loop_until_bit_is_clear(sfr, bit)   do { } while (bit_is_set(sfr, bit)) 

FILE uart_str = FDEV_SETUP_STREAM(uart_putchar, uart_getchar, _FDEV_SETUP_RW);



////////////////////////////////////////////////
void my_delay(int w) //Define delay function.
{
int i;
for(i=0; i<= w ; i++)
_delay_ms(1);
}




////////////////////////////////////////////////

void initUART()
{
	UBRRH =0;
	UBRRL = 11;	   // for baud rate=19200
	UCSRC = 0x86;	  // mode 8N1
	UCSRB = 0x18;	 // enable RX and TX
}
//---------------------------------------------------
void sendByte(char x)
{ 	while((UCSRA & 0x20)==0 )
	;	//wait till bit 5 of UCSRA is set check bit 5 (UDRE)
	UDR=x;
}

	
	//////////////////////////////////////
	
//stdout = stdin = &uart_str; // map stdin and stdout to serial port

int main(void)
{

ADMUX= 0b00100000; // chan 0, left adjusted,Vref=5
ADCSRA= 0b10000110; // ADC enabled, pre-scalar 64
DDRA= 0; //PORT A input



unsigned int x ,lsb , msb,c1,c2 ; //declare the temprature
char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8','9','A','B','C','D','E','F' };

unsigned int w;
unsigned int result;

////////////////////////////////////////////////
	ADMUX= 0b00100010; // chan 0, left adjusted,Vref=5
	ADCSRA = ADCSRA | 0x40 ; // start conversion.
		do {
		w = ADCSRA & 0x10;
		} while (w == 0); // repeat until EOC
	result = ADC; // the sampled data is in result
	// we can do whatever with the sampled data.
	//For now, we will display in on PORTD
	result = (result>>8); // truncate from 10 to
	x=result;
	/////////////////////////////////////////////


lsb = x& 0xf ;
msb = (x>>4) & 0xf ;
c1= hex[lsb];
c2= hex[msb];
while (1)
{

initUART();

{

        
sendByte('X');sendByte('=');sendByte(' ');
	                sendByte(c1);
		sendByte(c2);
				my_delay(1000);

	            }

}

return 0;
}