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Old 02-05-2014, 03:49 AM   #170
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Join Date: Oct 2011
Location: Melbourne
Posts: 541
My Ride: 330i
Originally Posted by CSL323 View Post
Hey Pete, there appear to be four resistor footprints on the board which do not appear in your schematic, and there are no other resistors in the kit.

What are these for, and do I need them?
R9,R10: Not needed. They are just an after-thought, a way for the ATtiny to talk directly to the Pi. I've never used them for anything.

R11,R12,Q5,Q6: Not needed. If you populated them with 100K and BSS-138 (not supplied), it would allow the ATtiny to transmit on the IBUS. But it never needs to transmit.

C6: Not needed. Just some spare access to the 5 volts. Or put a big-ass cap here if your Pi is rebooting when you start the engine (I doubt it ever would).

Last edited by PeteAU; 02-05-2014 at 03:51 AM.
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