I have successfully converted the ShiftMatrixPWM library to work with the Teensy 3. This library uses SPI4Teensy3 and IntervalTimer libraries to maximize the speed. It handles a 10x16 RGB matrix and I will test it on a larger matrix soon. My test bed uses 2-75HC595/PNP transistor array on the anodes and 4 or 2 TLC5916/26 on the cathodes. I have a 3 to 5.5v 74HCT245 logic level converter on the output data lines of the Teensy. For the Teensy I separated the 3 & 5 volt lines, added the 2 diodes, and use a 40 amp 5 volt power supply. I have 1uf/0.1uf ceramic capacitors on each shift register - both anode and cathode.
However, some of the LEDs stay partially lit at all times, and others partially light up as ghosts to fully lit LEDs. I have switched out the shift registers, and shortened the wiring with no luck. Also tested using a Teensy 3.0 and a 3.1. On the UNO a few LEDs stay on constantly, but is much worse on the Teensy 3 with the ghosting problem added. I've included the schematic and an image of the LED matrix problem.
Any suggestions?
However, some of the LEDs stay partially lit at all times, and others partially light up as ghosts to fully lit LEDs. I have switched out the shift registers, and shortened the wiring with no luck. Also tested using a Teensy 3.0 and a 3.1. On the UNO a few LEDs stay on constantly, but is much worse on the Teensy 3 with the ghosting problem added. I've included the schematic and an image of the LED matrix problem.
Any suggestions?
