Question about connecting a Teensy 3.2 to an external Power supply and a Logic level Converter. In an earlier post of mine I had asked why my LEDs were flickering when working on the Teensy 3.2. Some of the users there suggested that i look into a logic level converter. I ended up going with this Adafruit 4-channel logic level converter.
I have tested it and have successfully converted from 3.3V to 5V. The only problem is that i am not able to display any of my code onto the Matrix itself. The top few rows of the matrix will glow white and that’s about it. I’ve included a drawn out schematic of my setup for someone to look at.
Definitely use the right type of level shifter. That mosfet one is worse that just using the 3.3V signal (which often works, but just barely). You should also try to use the right resistor for the type of cable. 410 ohms is rather high, but might be ok if you use ordinary loose wire. The best (economical) wire is CAT5 or CAT6 cable for networking. When you connect the signal to one of the twisted wires and GND to the other, use exactly 100 ohms. CAT5 & CAT6 are specifically designed for 100 ohms termination.
I made a video explaining exactly how to do this without level shifters at all. Super simple and reliable circuit using just 2 diodes!! Works with WS… APA… etc chipsets.
