This morning I tried debugging the thermostat interface I started working on yesterday. I first discovered I hooked to the wrong set of wires in the thermostat. I need to get on the Y and common leads. I now get 24 vac when it calls for cooling. Interfacing the HCPL3700 opto turned out to be difficult. The 10k series resistors didn't work. I lowered them to 5 k but still no output change whenn 24vac was applied. Removed the DC filter cap on the front end and was able to get AC out when 24 vac was applied. Added a simple lowpass filter output consisting of a 1 mfd cap and the avr internal pullup resistor. It's solid now but the AC only ran shortly. I found out that the Xbee is not working. I looked through my parts box from Adafruit and found I have an Xbee. Now I have to figure out how to program it to the correct channel unless it's already correct because this was used as the monitor. Libbie made her nice pizza which I doctored with thai pepper, onions and had it with a bottle of Sierra Nevada Oktoberfest. Yumm.