TEMPERATURE DISPLAY ONLY USING 7 SEGMENT DISPLAY AND LM35

Other Hardware LEDs and Multiplexing
4
  • Use the code-tag
  • I don't see that you have code for the zero
  • You repeat the same code over and over again. Maybe you want to move some to functions and/or use lookup tables
digitalWrite(D1, HIGH);
 digitalWrite(D2, LOW);
 digitalWrite(D3, LOW);
 digitalWrite(D4, LOW);

// At this point you have activated the new digit, but the segments are the old values.
// This will cause ghosting.

 digitalWrite(pinA, HIGH);  
 digitalWrite(pinB, LOW);  
 digitalWrite(pinC, LOW);  
 digitalWrite(pinD, HIGH);  
 digitalWrite(pinE, HIGH);  
 digitalWrite(pinF, HIGH);  
 digitalWrite(pinG, HIGH);
 break;

You need something like this:

allDigitsOff();
setSegments();
activateDigit();