Hi, maybe you can help shed light on a weird problem, I have a Sparkfun pro-mini running a single MAX7219 on a prototype board I had made. It has run fine, i.e. days. I built a 3rd board and all of the segments LED's were on full brightness, even though I used the same 30k ohm for Rset as the other …

MAX7219 won't dim

Grumpy_Mike September 2, 2016, 4:27pm 12

Can't see any ceramic decoupling caps just a single tantalum, that is not sufficient.

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