Who doesn't like an update?!
This new version doubles the operating frequency of the TLC to 8 MHz, which increases functional brightness and also allows what is now 16 (!) levels of temporal dithering.
To answer this part of your question, no, the risk of damage is low. USB ports on laptops are traditionally protected from overvoltage, I think up to something like 21V. I've been working this way for close to 10 years...
This is great. The current library runs the TLC at 4 MHz and when I tried to double the frequency I encountered this overshoot. I'll have to try adding the resistors!
This is very odd, because I too have designed a custom board for up to 16 chained TLC5940 with the T4.0, I've constructed this board twice with up to 8 chips populated and it works great.
I assume if you are using...
I have had bad experiences with this breakout board. Almost immediately after using it it became defective. Your problem sounds a lot like a bad connection, but maybe on the Teeny side since it works well with T3.2.
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