In this post you can see very interesting LED propeller clock, which is my final exam on Faculty of Elevtronic Engineering in Niš, Serbia. Also, there is scheme of propeller and base and radio community, which is used to transfer data from base to propeller. With that community we can send information about time and pictures (monochromatic (79×79).BMP). Microcontroller on propeller is PIC18F2515 (SMD).
This is 3D layot of propeller PCB (maded in Proteus Profesional – ARES PCB Designer).
Scheme of this propeller is on this picture:
This propeller have 40 LEDs (3mm), RTC pcf8563 (for time and date) and flash memory. Radio community receiving information from base and send it to microcontroller, where that information is processing. Next step is send processed information to shift registers (74HC595 on PCB on bottom layer), and finally that information go to LEDs.
Base have three parts. First, power supply, maded like air transformer (primary coil – static coil, have above 200 turns, secundary – rotary coil above 400-500 turns), and on propeller we have is 12VDC. Scheme of power supply:
Power supply
Secound, there is motor speed control, where we can control speed, and make better view of pictures on propeller. Scheme of it:
Speed motor control
And last part of base is data transfer:
Data transfer
When all work, you can see something like this:
IEEE logo
Faculty of Electronic Engineering logo
Finalized LED propeller look like this (there is a few pictures (PCB, mask, propeller, base…)):
Mask – top (right) and bottom (left)
Flash memory
