When [Im-pro] wants a display, he wants it to spin. So he built a persistence of vision (POV) display capable of showing a 12-bit color image of 131 x 131 pixels at 16 frames per second. You can see a video about the project below, but don’t worry, you can view it on your normal monitor.
The project starts with a Java-based screen capture on a PC. Data goes to the display wirelessly to an ESP8266. However, the actual display drive is done by an FPGA that drives the motor, reads a hall effect index sensor, and lights the LEDs.
Perhaps the most interesting part of the project is the FPGA-based mapping of the rectangular coordinates of the incoming video to the polar coordinates required by the display. There are 4 arms of LEDs or “wings” and a 3D printed structure that is all included in the post.
The FPGA is a Cmod S6 which is a breakout board for a Xilinx Spartan 6 with more than enough horsepower to handle the workload. There are also custom PCBs involved, so when you think about it, it is a fairly wide-ranging project. Java software, ESP8266 software, FPGA configurations, a 3D-printed design, and PCB layouts. If you want something simple to tackle that has a bit of everything in it, this might be your next project.