ATtiny85 and MLX90614 cannot read temperature data

[Brazilino]

@egorwatson

if (temp > 0 && temp < 60) {
    digitalWrite(GREEN_PIN, HIGH);
    }
  else {
    digitalWrite(GREEN_PIN, LOW);
    }

  if (temp < 1) {
    digitalWrite(BLUE_PIN, HIGH);
    }
  else {
    digitalWrite(BLUE_PIN, LOW);
    }

This might not be the cause of the problem, but it is a problem for the logic of your code anyway. Let us suppose that the temperature is 0.5. It would satisfy both conditions to light up green and blue pins simultaneously.