POV Part Two

Now we've finished the LED display it's on to the persistence of vision stuff. Here is a list of the things we need to learn and experiment with:

Hall Effects - we will be using hall effect switches connected to each spoke containing LED's. The switches will be triggered each time the spoke passes a magnet (in a fixed position). Since the wheel will be spun by hand (and will gradually slow down), we need to do figure out a way of calculating the revolution per minute of the wheel in order to then calculate the LED refresh time.

16-bit LED Driver - More experimentation needs to be done with the LED driver. We've got the shift register part sorted, but we also need to look into the PWM for individual LED brightness.

Circuit board design - Although it looks cool, having lots of wires is not big and it's not clever.

Bike Wheel - Possibly the first thing to do is find a bicycle wheel and figure out how to build a sturdy enough stand so people can spin the wheel.

Since some parts will be spinning and others stationary, we are going to need to look into ways of keeping an electrical connection whilst it's rotating. Two methods are slip rings and rotary transformers.

All of this before July, hopefully.