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Thread: Arduino boost gauge project

  1. #1
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    Arduino boost gauge project

    So the one thing I miss from my old Jag is the boost gauge ..didn't want to put one in the vents or to have one in a pod (they look silly imho).
    I hate the OBD ones the update is just too slow .. and I wanted it to be independent of the ecu.

    these are the boards I've used ..just mounted on a bit of veroboard
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    It's just an arduino Nano (328P clone) with a buck boost converter so it'll take any voltage from 7 to 28V and output a nice 5V for the sensors and Arduino


    The 0.96" Oled screen fits perfectly in the rear of the fascia for the storage trays above the head-unit...its like it was made to go in there...just had to cut a hole for the screen

    Click image for larger version. 

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    you can see here the setup being bench tested
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    It uses two very cheap MAP sensors from ebay one measures the boost the other is a reference and monitors the atmospheric pressure and one reading is subtracted from the other
    so that the reading is correct no matter where in the world or at what elevation you're at.

    The Idea is to have the PCB in one of the storage trays and route the cable out the back (drill a hole).... the front still clips on and off just as normal.
    Click image for larger version. 

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    managed to get a picture halfway through a refresh cycle..you can't see this in real life obviously.

    Click image for larger version. 

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    not looking too shabby ...note this is cheap second hand storage unit 11 ..cost less than just getting a spare trim for my storage tray.
    Also allowed me to work out how to get the trays out without removing the whole storage unit.

    Arduino Nano cost me 1.59 each (bought as a pack of 5)

    Buck boost board 1.29 each (bought as a pack of 5)

    Oled screen ..left over from an ESP8266 project but originally (2.39 each)..need to get some more.

    Map sensor 8.35 ..I already had one (the one with the glue on was originally used for a weather station project last year) so bought another same seller still had them in stock.

    spare storage unit 11 .

    so thanks to the extra MAP sensor this'll cost me just under 25

    During more normal times when I could go to a scrapyard the map sensors would have been well under a fiver.


    Just need to tap into the boost pipe work near the inlet manifold on my jag I drilled and tapped an M5 hole in the EGR valve body so I could run some 6mm legris air pipe...probably do similar thing here.
    then find somewhere to tuck the sensors out of the way ..under dash or behind head unit ..where ever.

    (air fittings and pipe will be free..I've got loads from old machinery I've stripped)

    Also still need 'calibrating' ..I can do that on the bench with one of my SMC pressure gauge/regulators hooked to my compressor...(just got to alter a few multipliers and offsets in the code.)

    but it works ..blow into the pipe it registers boost and vacuum..thanks to the reference sensor and a small bit of smoothing in the code its not jittery

    I'll update when I get it in the car.
    2008 Passat Estate 2.0 TDI-PD BKP

  2. #2
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    Got time to calibrate the gauge on the bench.
    Click image for larger version. 

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    Also got it fitted into the car.
    turns out getting the storage drawers out is fairly painless just had to drill a hole in the rear of the drawer and receptacle for the sensor and power cables .
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    its getting crowded behind the headunit
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    looks very unobtrusive which was the idea.
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    quick demo on my drive


    needs a bit more smoothing in the code and moving the boost reading up 5 pixels or so.
    the display isn't flickery in real life its just the camera on my phone.

    current code for the gauge is here.
    https://drive.google.com/drive/folde...3E?usp=sharing
    Last edited by silverestate; 23-05-20 at 14:45.
    2008 Passat Estate 2.0 TDI-PD BKP

  3. #3
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    Also took the time whilst adding the port for the 6mm pipe to clean out the egr.
    Mr muscle works a treat on EGR's
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    6mm port added (drilled and tapped M5 thread) and a bit of high strength thread-lock.

    Click image for larger version. 

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    6mm Pu (polyurethane) pipe run from here through the body grommet on the rear of the firewall under the battery tray..under the glove box (UK car) into the space behind the head unit where a 6mm to 8mm adapter and short section of 8mm Pu Pipe is used as 8mm PU pipe fits perfectly on the input of the sensor ...sensors are behind the head unit
    Last edited by silverestate; 23-05-20 at 21:28.
    2008 Passat Estate 2.0 TDI-PD BKP

  4. #4
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    Just in case any other nutter like me wants to do this .
    Click image for larger version. 

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    code is here ..

    https://drive.google.com/drive/folde...3E?usp=sharing

    Has VW logo on start but there are loads of online tools making it easy make another logo.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by silverestate; 23-05-20 at 21:16.
    2008 Passat Estate 2.0 TDI-PD BKP

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  6. #5
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    Stupid screen jump!
    "I disapprove of what you say, but I will defend to the death your right to say it"

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