Photo sensor for the lasers

(to detect Michael moving through them)

These are the boxes for the photo sensor, one closed and one open:



As a connector I took a normal BNC connector, as they connect well, and cables are common. I bought some 3m cables, but I am not sure whether that will be long enough.
The photo sensor is mounted into a little tube, and the careful observer may recognize the tube from what was once a laser pen. Yes, this is recycling.

A close-up:


I tried to mount the sensor itself, as well as possible in the middle of the tube. Also notice the foam underneath the tube, to keep the tube in place.

There is still some space left to screw on a connector for the microphone stand.

Before closing the box, another piece of foam goes on top:



So that in the end the tube is pushed towards the middle from both sides. The lid only fits on one way, so that is easy to figure out. No need to screw anything either, as the lid closes tightly. You'll need a screwdriver to open it.

As I mentioned, I used the remains of the laser pen for the tube. This means that for transport the tube can be closed:



and before use opened again:




One more note on the photo sensor: the laser emits at 532 nm. This means that it would be most handy to have a photo resistor that has its peak sensitivity on that wavelength as well. From the Reichelt catalog, I get the following photo resistors with a peak at 530 nm (close enough):

A90513
A90514
A995011

They slightly vary in resistance.

I will check out if my local electronics store Segor has these as well, or others that match the right wavelength, so that I can finish the sensors properly before sending them out.