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Ok, thanks to you I found the problem ! The 6n138 and 137 don't have the same wiring . I got it working with by correcting the connection of the opto isolator
(basically, it's pin 5 to ground, 6 to...

Yes I've been using an opto-isolator, but it was a 6n137. Does it make any difference with the 138 ?

Thank you Darrel,
Actually, I've been trying to wait for a $90 byte too, but in this case, it seems that the pic doesn't see the start byte at all (or only from time to time)
Do you see any other...

Hello,
I've been trying to figure out how to build a midi shield with a 16f876. I'd like to use midi messages to control servos and lights, and control sounds from the pic, via the midi protocol. I...

Hello everyone,
I have the same problem with a 24lc1025, used as a data logger with a 16f876.
It writes and reads fine on the first block, but won't write anything on the second block.
Does anyone...