I had to do away with the opto-isolator because i needed current gain to drive the high intensity IR LED, so I'm now using an NPN transistor, pn2222. 

In other news, I added a circuit to detect the low battery signal from the boost converter board. I will use that signal to halt the OS. I'm going to try the event interrupt method of the python module in the pir-detect script, since i will have 2 inputs to monitor now, low battery and PIR sensor. 

I've also started organizing the code in the github repo into server and client; the Pi being the client and the server being the target of the uploads. The server also runs the scripts that add the time stamp overlays and stitches the frames together into avi movies.  I initially tried to add the overlays on the Pi, but it couldn't process each image fast enough to keep up with the image per second stream from the camera.