Not strictly LED related,

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Not strictly LED related, but this is for an LED project and you guys are smart about this sort of thing :slight_smile:

I posted about a PCB design issue on http://electronics.stackexchange.com where I can’t program my ATTINY85 on the board I designed for an LED pendant I’m working on.

Detailed info is at at the link below.

The one suggestion I have so far doesn’t seem like a bad idea, but it doesn’t smell like the solution either. I’m thinking of upgrading to an ATTINY84 with more pins so that I don’t have to have programming and functional components share pins at all, if that’s the problem.

Anyone have any ideas what I may be doing wrong?
http://electronics.stackexchange.com/questions/160705/program-an-attiny85-on-the-pcb-is-causing-me-some-trouble/160771?noredirect=1#comment326941_160771

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Can you disconnect the LEDs via J3 and try to flash the chip?

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Good question. I will try that soon as I get a chance. If my hypothesis is right, the answer should be yes.

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I’ve not tried an Attiny85 yet, but I’ve had exactly the same problem with an atmega328 when I used one of the spi pins for the led strip. I had to add a"programming" jumper to my build.

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Sadly this project is too small for an easily removable jumper. Guess I’m upgrading the MCU.