And another two months go by! :-pnitrousnrg wrote:See you on tuesday, on a super reloaded mega post!
Re power and ground connections, you only need two power connections if you use enable pins on the regulators and feed them from the cpu ACC enable output.
IE:
- Constant high quality direct from battery power FOR both regulator supplies
- Key-controlled-relay switched high quality direct from battery power FOR BRV reference and key-on signal
If you don't have the CPU control the accessory power (IE, no sd card reader/writer) then you ALSO need another clean key switched battery sourced 12v feed to control the second regulator.
With respect to grounds, same old stuff still applies:
At least:
- Clean CPU/ADC ground as reference
- Ground for all switching low side drivers
Separate the different groups of low side drivers from each other:
- Injector grounds
- Accessory grounds (fuel pump, idle valves, boost valves etc)
- Ignition driver grounds (if being done on board)
I suspect the injector ground being shared with the low current/voltage ignitor drives on my Puma was responsible for not running the Volvo that I tried to run, but I could be wrong. Certainly there was significant potential swing from somewhere, and I suspect injector loading was the cause, though I could be wrong.
If this project has been discontinued, let me know, if not, see if you can find the time to get out "Tuesday's" post for us :-)
http://www.youtube.com/watch?v=sTFDG0tEYtQ
Desde Nueva Zelanda! Buena mierda! I'm certain that that doesn't translate well, but it's what I'd say en Ingles :-)
Fred.