LED Multiplex with Arduino Mega

Projects General Guidance
1

I was following this tutorial on LED multiplexing (https://www.youtube.com/watch?v=uQMUPhyoXoE) to make a 4x4 matrix using a TLC5940. I did my best to order all the same parts. I recreated the attached diagram, the only difference is I had one fewer row and 6 fewer columns (Credit to GreatScott!, by the way). It works great with a Nano and an Uno, but when I hook it up to a Mega, it no longer functions.

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I've replaced all the wires and chips several times, and in doing so I noticed that if I pinch the wire going to the GSCLK pin of the TLC5940, the LEDs flicker. They don't work properly, but they do light up. And I have to pinch the wire. Wiggling it or just touching it does nothing.

Does anyone have any clue why this would be or what I could do to get it working with an Arduino Mega?

2

Hi! I'm new to Arduino but maybe heat shrinking or saudering the wires would help keep it in place

3

Are you using hardware SPI? Have you accounted for the fact that the Mega's hardware SPI aren't on the same pins as the Nano and Uno?

4

Saudering will fix it every time.

5

I think lastchancename agrees with saudering, and I would also do what van_der_decken said as well. You could also verify the code and see meticuously if each pin is in place and if each wire is touching

6

Ah, snap! I had no idea! I did a bit of digging and found this page for anyone else having this problem (Google Code Archive - Long-term storage for Google Code Project Hosting.). Thanks so much!

7

Believe it or not, Google can’t find Saudering

8

I think it is the act of making furniture from particle board:
https://www.sauder.com/

9

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