"Why you simulate temperature? Temperature is not logic. Temperature is the world. Proteus cannot know your room. Just write code, flash chip, measure real. Simulation is map, not territory."
You should see temperature readings in the Virtual Terminal or Serial Monitor. mlx90614 proteus library
Appendix C — Test Vectors
void setup() Serial.begin(9600); mlx.begin(); "Why you simulate temperature
Appendix E — References