Results 1 to 9 of 9

Thread: Analog input / CALC-PID

  1. #1
    Junior Member AWL INN's Avatar
    Join Date
    Jul 2007
    Posts
    11

    Default Analog input / CALC-PID

    Hey all, I'm looking for a pressure transducer so I can log fuel pressure using the analog 1-5 volt input on the black box. Has anyone here used the analog input with a pressure sensor? I have been stumbling through the calc._PID to change the 1-5 volt single to a PSI but still having problems with understanding how to edit the calc.text script. Any help would be great!!! Thank you for any input!! Brett~

  2. #2

  3. #3
    Junior Member AWL INN's Avatar
    Join Date
    Jul 2007
    Posts
    11

    Default

    YES! thankyou! I fixed the PID from this tutorial and there it said they were using Autometer's 2246 pressure sending unit. Thanx again! Brett~
    Last edited by AWL INN; September 22nd, 2007 at 11:08 AM.

  4. #4
    Junior Member AWL INN's Avatar
    Join Date
    Jul 2007
    Posts
    11

    Default

    I found an error in the Tutorial in their math on the calc_pids.text in my setup anyway. The math they had setup was ({EXT.AD1}*25)-12.5 If the sensor is 1-5 volt and 1=0 and 5=100 this wont work right. 1x25=25-12.5=12.5 so 1volt would = 12.5 psi. and 5volts would +112.5 psi

    Ok this is what I came up with an it works right for me.
    PSI 0 100 .2 {EXT.AD1}*100/4-25

    1v x100 = 100 /4 =25 - 25 =0psi
    5v x 100= 500 /4 =125 -25 = 100psi

    It seems to work perfect so I'm not sure what I did different that the Tutorial wouldn't work right. Just food for thought I hope this helps someone else on setting up the analog input. Brett~

  5. #5
    New Member
    Join Date
    Jan 2004
    Posts
    7

    Default

    Brett

    Thanks for letting us know.
    I came up with this after you pointed out the error "({EXT.AD1}*20)"

    Thanks
    Andy

  6. #6
    Junior Member AWL INN's Avatar
    Join Date
    Jul 2007
    Posts
    11

    Default

    Quote Originally Posted by acsf
    Brett

    Thanks for letting us know.
    I came up with this after you pointed out the error "({EXT.AD1}*20)"

    Thanks
    Andy

    Andy,

    I still think that if you use ext.ad1 x 20 will not be accurate.
    The sending unit will out put a range of 1-5 volts (if the out put is zero then something has failed) so 1volt would be 0 psi and 5 volts would be 100 psi at least on the sending unit I have (autometer) In your calc 1 volt would equal 20 psi when the pressure is accually 0. 5volts would be 100psi though.

    The way around this is to take out the 1v offset and use a 4 volt range instead of a 5 volt range. For some reason EFILive didn't like the first calc I tried witch on paper works correcty. {EXT.AD1} -1/4x100 Im not sure why but wording it this way worked. {EXT.AD1} x100/4-25 It tracks my analog guage within a pound +/-. I hope this makes sense. Brett~

  7. #7
    Lifetime Member Ninety8C5's Avatar
    Join Date
    Sep 2003
    Posts
    433

    Default

    I think your first calculation didn't work because you are missing a set of brackets.

    Try: ({EXT.AD1} - 1) * 25

  8. #8
    Unknown Zone TAQuickness's Avatar
    Join Date
    Jan 2005
    Posts
    2,940

    Default

    Welcome to the forum Brett. Sounds like you're off to a great start.
    What sending unit are you using?

    When Beer99c5 and I were working on this, we both spoke with Autometer and they stated the 2246 had a 0-5vdc output range. Just want to make sure the tutorial is correct.

  9. #9
    Junior Member AWL INN's Avatar
    Join Date
    Jul 2007
    Posts
    11

    Default

    Yeah, I was wrong. It is working from 0-5 volts. Now it's correct. I must have been smoken crack Thank you guys for the help. On a brighter note. I entered a Dyno contest last weekend. I made 594.2 RWHP with my EFILive tuned Duramax. Tune made by me and help from you guys. Brett~

Similar Threads

  1. Replies: 4
    Last Post: April 22nd, 2009, 03:50 AM
  2. V2 analog input ground configuration.
    By mistermike in forum FlashScan V2
    Replies: 1
    Last Post: June 15th, 2007, 01:37 AM
  3. need analog input spec
    By foznoz in forum General (Petrol, Gas, Ethanol)
    Replies: 0
    Last Post: March 5th, 2007, 02:46 PM
  4. FJO Analog Input AFR PID
    By heavyfoot in forum External A/D inputs
    Replies: 5
    Last Post: August 14th, 2006, 09:11 AM
  5. FJO Analog Input AFR PID
    By heavyfoot in forum General (Petrol, Gas, Ethanol)
    Replies: 5
    Last Post: July 15th, 2006, 03:26 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •