Pentax s5z LED-ring

More light for macro shots - or so I hope.

The center hole (28mm) should be wide enough to make this ring just slip over the camera's extended objective and bring the light to where it is needed. I may have to do some grinding and smoothing of the inside to get a good fit and prevent scratching the objective - which is made of silver painted plastic.

I was able to squeeze a little controller board inside the cutout area. No fancy constant current control, just a lot of resistors, a mosfet for PWM control and an ATtiny13 with up/down buttons. It's meant to run with 5V DC.

Initially I had the idea to add a little boost converter to make it run with 3V (2x AA cells) or a LiPo, but that was scrapped.