Please forgive me if this has been covered elsewhere. I am needing to put together a temperature alert system for a greenhouse. If the temperature is over 90 degrees a relay to a red light needs to come on. Below 90 to 50 a green light, and below 50 to 40 yellow and below 40 red. We are actually installing a real traffic light to serve in this capacity. (The temperatures will probably be close but could stand some refinement.). Any advice, links, products, etc. will be greatly appreciated.
Thanks.
Ken