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Old 10-26-2011, 02:03 AM   #1 (permalink)
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MPGuino Values lost after powered down?

Hey guys.
I hooked up the MPGuino in my 94 Civic DX today and I noticed something about it which is problematic.
I incorporated a power switch in the circuit so that the MPGuino doesn't have to be on when the car is off and parked.
However, when I turn the power off I lose my Tank miles and distance.
My U/Sec and VSS Pulse figures remain saved though.

Any way to fix this?
Or does everyone else leave their MPGuinos powered on all the time?

Thanks.

JJ

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Old 10-26-2011, 02:17 AM   #2 (permalink)
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mine is on, always, about 20milliamps idle. The backlight turns off after 7 minutes of no activity. It keeps the setup parameters in eprom, but the trips are in ram for speed/accuracy.
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Old 10-26-2011, 02:48 AM   #3 (permalink)
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Quote:
Originally Posted by dcb View Post
mine is on, always, about 20milliamps idle. The backlight turns off after 7 minutes of no activity. It keeps the setup parameters in eprom, but the trips are in ram for speed/accuracy.
Awesome! Thank you!
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Old 10-26-2011, 04:29 AM   #4 (permalink)
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In wiki section there is code how to save tank parameters to eeprom - so you dont lose them if you want to disconnect mpguino sometimes or you get power loss.
I made some changes to my code so mpguino goes to sleep and consumes around 5-6 milliAmps. If someone is interested, I can check code and put that part here or in the wiki. It was quite easy actually, just added one line into that block where backlight is turned off.

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