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Chariot Gauge - Wideband O2, Boost/Vac, Oil pressure, Temp and Voltmeter for $35

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    Chariot Gauge - Wideband O2, Boost/Vac, Oil pressure, Temp and Voltmeter for $35

    UPDATE: I've moved threads: http://www.r3vlimited.com/board/showthread.php?t=307293

    Use coupon code r3v to receive $10 off the order.

    A while back I posted a project I was working on - a small controller that connects to five sensors: Wideband O2, Boost, Oil pressure, Temp and Voltage, transmits the data to a phone or tablet via Bluetooth and displays an analog and digital gauge. I’ve finished beta testing the units locally and I’m ready to get them out in the wild. I’m selling the controller and pigtail for $35, the app is free. I would love to hear what the r3v community thinks of the project.




    What you need:

    1. An Android phone*. Install the free app from the Play Store: App Link
    2. A controller/pigtail: Available from my site for $35: www.chariotgauge.com

    *Currently porting the app to iOS - will be available for iPhone 4s and up in a few months – Let me know if you’re interested.

    How it works:



    The controller comes with a Motorola MPX4250AP 2.5 bar MAP sensor (this is the same sensor that comes with MegaSquirt) on board that only needs a vacuum source to work - it is preconfigured in the app. The other four sensors are connected directly to the controller via the pigtail and are configurable for just about any intended sensor type. The install guide shows which wire connects to which sensor (found Here). When the controller is turned on you simply tap “Connect” in the app and scan/select the controller from the list of devices.

    Here’s a rundown for installing the other four sensors and configuring them in the app: Wideband O2: preconfigured for gasoline wideband O2 with an AFR range of 7.22 - 22.39 but can be configured for many other fuel types and toggled for lambda or AFR. Oil pressure: preconfigured for an oil pressure sender showing 0-80psi but can be configured for almost any sender/sensor. Temperature: preconfigured for an open or closed element GM style sensor but will work with any thermistor type. The volt meter can be connected to any voltage between 0v and 25v.

    Screenshots




    Here’s a crappy video of it in action (I’m working on a better version..):



    What you get for $35

    Out of the box you get a 2.5bar (~21psi) boost/vacuum gauge ready to go. Connect the controller to a switched 12v source and a vacuum source and you’re set. You can stop here or connect the other four sensors as needed once you start expanding. I'd love to hear feedback on ordering through my site, fulfillment, and feedback on the project itself. Anyone willing to give it a try?
    Last edited by codrum; 12-18-2013, 04:12 PM. Reason: New Thread

    #2
    Ill be game to be your first victim......how accurate is this thing.....I just want it for a boost gauge
    Last edited by bmwm42; 11-21-2013, 08:34 PM.
    Originally posted by bmwm42
    PNW vulture pm me for parts
    Strategic nw e30 command

    Comment


      #3
      Dude, that's pretty awesome.

      Can we get a mod to move this to General, or Alternative Tuning? It's pretty relevant...
      past:
      1989 325is (learner shitbox)
      1986 325e (turbo dorito)
      1991 318ic (5-lug ITB)
      1985 323i baur
      current:
      1995 M3 (suspension, 17x9/255-40, borla)

      Comment


        #4
        Originally posted by bmwm42 View Post
        Ill be game to be your first victim......how accurate is this thing.....I just want it for a boost gauge
        It's very accurate! The way the firmware on the board works is it queries the sensors 20 times a second, bundles the data, and transmits its back to the phone for processing. The heavy duty processing is completed on the app:

        1. The boost/vac is calculated based on Motorola's formula (data sheet here).
        2. The wideband O2 is a linear signal configurable for any range to get more granular or macro range. It's preconfigured for 0v = 7.22AFR, 5v = 22.39AFR.
        3. The temperature is calculated using the Steinhart-Hart temp calibration model (more here).
        4. The oil pressure is also a linear signal, preconfigured for 0psi = 10 ohms resistance, 80psi = 180 ohms resistance. This is a pretty typical setup for VDO senders.
        5. The voltage is calculated through a 2k/10k voltage divider.

        Comment


          #5
          I'm in for one when it works with a 4s. Do you have any display color options?

          Comment


            #6
            Placing order......is the device going to be exposed or is it going to be covered?
            Originally posted by bmwm42
            PNW vulture pm me for parts
            Strategic nw e30 command

            Comment


              #7
              In for iPad and iPhone compatibility

              Comment


                #8
                This is really bad ass and VERY affordable. Might have to pick one up in a few months after others have tried it.

                Comment


                  #9
                  Originally posted by bmwm42 View Post
                  Placing order......is the device going to be exposed or is it going to be covered?
                  For now it's exposed, however it's designed to fit on the inside of a altoids tin (not a long term solution):

                  Comment


                    #10
                    Originally posted by Jalves619 View Post
                    I'm in for one when it works with a 4s. Do you have any display color options?
                    Originally posted by jaywood
                    In for iPad and iPhone compatibility
                    Originally posted by NitroRustlerDriver
                    This is really bad ass and VERY affordable. Might have to pick one up in a few months after others have tried it.
                    Originally posted by decay
                    Dude, that's pretty awesome.
                    Awesome, I appreciate the support. I'll be sure to keep you up to date when the iOS version is on the App Store.
                    Last edited by codrum; 11-21-2013, 11:02 PM.

                    Comment


                      #11
                      I want one but need it for ios. Please keep us updated.

                      Comment


                        #13
                        Love the idea but not with the idea of using a Phone (it's too small and people tend to text/talk/navigate). Wouldn't this be better suited for an Android tablet? Can we display all of the gauges at once on a tablet? I have seen people replacing their Navigation and stereo head unit with Tablets tethered to their phones for internet. With your device, having the ability to display large aux gauges would be awesome. It would be like a carputer. Brilliant idea.
                        Last edited by reelizmpro; 11-22-2013, 04:25 AM.
                        "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

                        85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
                        88 M3 - LACHSSILBER/SCHWARZE
                        89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
                        91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER

                        Comment


                          #14
                          This is awesome! Also in for ios.
                          Oh btw all values can be switched to euro?
                          Last edited by Fusion; 11-22-2013, 06:43 AM.

                          Comment


                            #15
                            In for IOS. Such an awesome concept.
                            91 318is M50 swapped
                            05 Honda Pilot

                            24V swap thread
                            http://www.r3vlimited.com/board/showthread.php?t=302524

                            Comment

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