Hi! I recently built my own incubator and I thought I would share my results for those that might be interested. I'm incubating a mixture of mostly Black Copper Maran and Ameraucana eggs, with a few Welsummer and White Egg layer eggs thrown in to make up the numbers. This is day one (3 hours to be precise). In this article (http://www.thepoultrysite.com/focus/contents/ceva/OnlineBulletins/ob_2005/Article-No3-Nov05.pdf) I learned that eggs start to generate their own heat at around 15 days or so, so the air temperature needs to be reduced accordingly. To monitor the egg temperature I've taped a thermocouple to the shell one of one of the eggs. With the this PID I'm able to control both the temperature and measure the humidity inside the incubator. I also have the ability to automatically control the humidity using an ultrasonic fogger. The whole temperature setup can be monitored via the PC. The blue trace is the air temp just above the eggs and the green trace is the shell temp of one of the eggs. As you can see the the incubator is in the process of warming up. Its been on for about 3 hours. The target shell temp is 37.8 C (100 F). The whole system has been calibrated using a NIST thermometer.