Code to send temperature in ATmega16 C

Write an ATmega16 C program to send temperature range of –4 to +4 to port B.

Here we will keep in mind some things like

• We need to use the least possible memory space as possible, such as by using unsigned variables etc.
• now as we are also asked to input the values which take - value hence we need to implement a signed array too.
• we will need to set DDR B as output so we put 11111111 in it as 1 makes the port bits output.
• The value which we will write will be send are to be written on PORTB register.
• 
  
• Code:

#include<ave/io.h>

int main(void)

{

    char num[] = {-4,-3,-2,-1,0,+1,+2,+3,+4};

    unsigned char z;

    DDRB = 0*FF;

    for(z=0;z<8;z++)

    {

         PORTB = num[z];

    }

    return 0;

}

Note: The negative values will be displayed in the 2’s complement form as FCH, FDH,FEH,FFH, 00H, 01H, 02H,03H,04H .

(hex values of -4,-3,-2,-1,0,1,2,3,4)

Ref : Prof.Gaurav Verma