In this article, I go over how I built a humidity alert system that is being used to monitor temperature and humidity for hay farming. The idea is that when you bail hay, it needs to be during the night, and when the humidity is over 60%. Hay farmers tend to lose sleep waiting to see when the humidity is just right to go out and bail their hay. I was asked if I could build a device that would monitor conditions out in the field where the hay is on the ground waiting to be bailed and then send an alert to the farmer from these remote locations once optimum humidity is reached.