Wireless POV Clock

thingiverse

The remix applies a clock designed by holybaf (https://www.instructables.com/id/Arduino-Wireless-Power-POV-Display/) with snug's POV clock case. The Arduino Mini and LED's are powered wireless by a coil underneath. This effectively creates a transformer with the coil fixed to the rotating CD. It generates around 8V from a 5V source. I created a board to mount the oscillator rather than use strip board. It also allowed me to use a medium power transistor to allow for a higher voltage (it can get really hot at 12V but is fine at 5V). None of the RTC boards I had were really small. I designed a simple board that takes a DS1302 and 32.768kHz crystal and uses a header that aligns neatly with the Arduino. The battery used by the RTC to keep the time even when power isn't present is mounted as the counter weight for the Arduino and RTC boards. The code that holybaf used seems to be used by many of these type of POV systems. It assumes the motor will spin at a constant speed and all timing is hardcoded. I have rewritten the code to use Timer1 to measure the rotation speed and Timer2 to output the leds based on the rotation speed.