Help needed to scale Apexi map sensor
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Joined: Mar 2008
Posts: 1,392
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From: uk
it will more than likely change daily with atmo fluctuations
nothing i'd keep adjusting tho will be very small just annoying to not see 0 when just key on
ps very surprised at that formula being right unless your thousands of feet below sea level?
mine for reference Eval="(0.18375*x-14.7)*1.47"
nothing i'd keep adjusting tho will be very small just annoying to not see 0 when just key on
ps very surprised at that formula being right unless your thousands of feet below sea level?
mine for reference Eval="(0.18375*x-14.7)*1.47"
Last edited by leecavturbo; Jul 24, 2010 at 04:24 AM.
it will more than likely change daily with atmo fluctuations
nothing i'd keep adjusting tho will be very small just annoying to not see 0 when just key on
ps very surprised at that formula being right unless your thousands of feet below sea level?
mine for reference Eval="(0.18375*x-14.7)*1.47"
nothing i'd keep adjusting tho will be very small just annoying to not see 0 when just key on
ps very surprised at that formula being right unless your thousands of feet below sea level?
mine for reference Eval="(0.18375*x-14.7)*1.47"
The sensor operating voltage is 0.5V - 5V, so my formula is correct
ie
(102 (which is the RAW value) * 0.1922)-19.6
=.0044
Cant get much closer than that
Last edited by philr8; Jul 24, 2010 at 02:31 PM.
Evolved Member
Joined: Mar 2008
Posts: 1,392
Likes: 2
From: uk
i just don't get how you can have 19 odd as your starting atmo figure
it only varies small amounts with altitude so should still be in the 14's
my key on will be at 0 on days when the pressure atom is exactly as the day i scaled it
so other days will see either + or - of zero
it only varies small amounts with altitude so should still be in the 14's
my key on will be at 0 on days when the pressure atom is exactly as the day i scaled it
so other days will see either + or - of zero
Last edited by leecavturbo; Jul 24, 2010 at 02:59 PM.
i just don't get how you can have 19 odd as your starting atmo figure
it only varies small amounts with altitude so should still be in the 14's
my key on will be at 0 on days when the pressure atom is exactly as the day i scaled it
so other days will see either + or - of zero
it only varies small amounts with altitude so should still be in the 14's
my key on will be at 0 on days when the pressure atom is exactly as the day i scaled it
so other days will see either + or - of zero
In evoscan see what your raw value is with key on but not started, so change your formula to just x and let me know
Mine is 101 or 102 and on multi meter is 2 V, I think thats where the difference is. It lines up perfectly with my Gizzmo MSIBC readings
Phil
Evolved Member
Joined: Mar 2008
Posts: 1,392
Likes: 2
From: uk
Can you do a test for me
In evoscan see what your raw value is with key on but not started, so change your formula to just x and let me know
Mine is 101 or 102 and on multi meter is 2 V, I think thats where the difference is. It lines up perfectly with my Gizzmo MSIBC readings
Phil
In evoscan see what your raw value is with key on but not started, so change your formula to just x and let me know
Mine is 101 or 102 and on multi meter is 2 V, I think thats where the difference is. It lines up perfectly with my Gizzmo MSIBC readings
Phil
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