I want to build an MLX90614 IR Thermometer that can control a relay when the temperature has reached a certain value.
Can you please advise clearly how I can implement it. And the wiring diagram and program for it.
@kpt55 ,
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Hi, @kpt55
Welcome to the forum.
Can you please tell us your electronics, programming, arduino, hardware experience?
Is this a school/college/university project?
Thanks.. Tom... 
Follow a tutorial, it should be simple, this, for example, shows how to read the temperature
Once it works add the relay to make your thermostat
It is not hard to implement what you want. Most of it is in the Arduino Cookbook, read that and you will have your answer.
That is an i Interesting project that could be a lot of fun but realize we are not a free design or code writing service. We will be happy help out with your design and or code but first you have to make an attempt to design it, write it, post it and explain what is not working properly.
If there is hardware it is always best to post links to technical information as there are many versions of the same or different items. Since we cannot see your project, my eyes are to weak, you need to post using the language of electronics, an annotated schematic, (best) or a clear picture of a drawing. Pictures never hurt. Frizzing diagrams are not considered schematics here, they are wiring diagrams, they may be great for assembly lousy for troubleshooting.
If this is not feasible there is a for hire section where somebody would happily do it for a fee.
Artificial intelligence gave all the answers to this project