spareadc ?

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turbo355
MegaSquirt Newbie
Posts: 19
Joined: Tue Feb 21, 2006 10:32 pm

spareadc ?

Post by turbo355 »

Is PT7 (processor pin 10) hooked to AN07 (processor pin 34)?

The reason i ask is because we wanted to use spareadc2 and it seems it is hooked to PT7 at the processor , we can turn PT7 on in the output port settings and the ADC7 gauge will go from 14 to 1024 as PT7 toggles on and off but stays at 14 with our 0-5v sensor hooked up.

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750essess
Helpful Squirter
Posts: 47
Joined: Mon Jan 21, 2008 7:00 am
Location: Maryland

Re: spareadc ?

Post by 750essess »

I ran into this just yesterday trying to hook up a fuel pressure sensor. If u use pin 5 on the amp seal, adc7 doesn't work. Adc7 does work on pin 29. This is with extra code 3.0.1x
76 CB750 honda with cbr600f4i tb's fuel and ignition. Microsquirt running msextra 3.0.1x code
grippo
MegaSquirt Guru
Posts: 921
Joined: Mon Feb 16, 2004 6:55 pm

Re: spareadc ?

Post by grippo »

PT7 was tied to ADC7 so the same pin could be used for a voltage or frequency based MAF. I you are not using a Frequency-based MAF, then make sure this isn't set in MT/TS and makes sure PT7 isn't selected as a spare port output. If configured that way then make sure you haven't indicated you have a second EGO sensor. If you haven't, then you should be able to read and record ADC7 as a voltage on the knock sensor gauge, but leave knock control disabled.

The connection should be to pin 5, pin 29 is tied to ADC6. These are hardware connections, the same for all software, but the output variable you read the adcs can be anything. The above paragraph applies to standard code.
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