Re: Uploading the Software

Posted by Seth on Jul 12, 2017; 12:29pm
URL: http://bluesaab-forum.90.s1.nabble.com/Uploading-the-Software-tp235p1123.html

I agree with Karlis; double check all the diodes (they should conduct in one direction, and not in the other), and they should all be in the correct way. 5v at the FTDI input won't hurt anything; that's what it was built for, and that's why the voltage regulator is there; to drop it to 3.3 (that pcb might actually be 3.6, then diodes drop it some more).

If you can take some up close, clear, pictures, maybe we can take a look and see if anything seems out of whack.

So first I would check that the pcb has power where it's supposed to; ~3.3v on the vcc pins with power applied. If you can't upload code then, look at the crystal; the chip can't upload without a good clock signal from the crystal. You did good troubleshooting by taking that chip and uploading bootloader & code via the Uno board so you know the chip isn't broken. It just comes down to power, and possibly the clock (my guess is power).