Experiments with a digital pin hole camera

I've seen quite a few companies starting to make custom body caps for DSLR's etc that have been made in digital pin holes cameras. It looked like quite an easy bit of camera DIY so i thought i'd give it a go. So far the sensor is defiantly getting enough light, but having big issues with focus, obviously im not looking for a completely sharp, crisp image, but enough so that you can see the subject. Here is what i've managed to do so far, hopefully with a bit more R&D might be able to get a slightly sharper image.