speedo output

A forum for discussing applications and implementations of the MegaShift transmission controller code for the GPIO from B&G. This can control up to 8-speeds and 6 shift solenoids (plus a 16x9 table for controlling a PWM line pressure valve). It has manual and fully automatic modes (16x9 load x speed table), with under and over rev-limit protection, and full data logging of all inputs and outputs (among many other abilities). A TransStim to test your completed board is also available.
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ashford
Posts: 89
Joined: Mon Oct 24, 2011 3:41 pm

speedo output

Post by ashford »

i have a programable speedometer in the car im working on it has a range of 500-900,000 ppm using the default 2002ppm it upadates a bit slow. the question i have is how high can the gpio go without loosing accuracy or saturating the output
Bernard Fife
Posts: 1696
Joined: Fri Apr 04, 2008 1:28 pm

Re: speedo output

Post by Bernard Fife »

ashford,

It depends entirely on the VSS input. This is covered here: http://www.msgpio.com/manuals/mshift/V41tune.html#sf

Lance.
"Never wrestle with pigs. You both get dirty and the pig likes it." - George Bernard Shaw
ashford
Posts: 89
Joined: Mon Oct 24, 2011 3:41 pm

Re: speedo output

Post by ashford »

vss input is roughtly 93000 ppm divide by 5 and get 18600, so the code should handle this well?
Bernard Fife
Posts: 1696
Joined: Fri Apr 04, 2008 1:28 pm

Re: speedo output

Post by Bernard Fife »

Yes, it should be fine.
"Never wrestle with pigs. You both get dirty and the pig likes it." - George Bernard Shaw
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