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    Possible issue with Tab5 and UiFlow v2.3.1 - (i2c driver install error)

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    • K
      Kenzo @robski
      last edited by

      @robski - hmmm.... Well that raw value was with nothing connected to the Tube Pressor sensor. Because nothing is connected to the tube pressure sensor I would assume it would be closer to 0 Kpa... 140Kpa is a big difference from 0 Kpa... I wonder what we are missing?

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      • K
        Kenzo @robski
        last edited by

        @robski I keep coming up with 140Kpa also...
        We must be missing something...

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        • robskiR
          robski
          last edited by

          just connect voltage to sensor and measure what voltage it is giving out between output pin and ground. for 0 kPa your raw Analog value should be around 1300 i think

          M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135, StamPLC, AirQ, M5Tab

          K 2 Replies Last reply Reply Quote 1
          • K
            Kenzo @robski
            last edited by

            @robski - I think you hit on something there! I measured the voltage between the ground and the sensor and it came to around 1.1v which according to the graph should be around 0 Kpa. (see attached photos) Something is definitely strange...

            VoltageReading_1.jpg

            PressureGraph_1.jpg

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            • K
              Kenzo @Kenzo
              last edited by

              This post is deleted!
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              • K
                Kenzo @Kenzo
                last edited by

                Also here is the formula I was using to calculate Kpa

                So for 12 bit parameter, this gives a kpa resolution of 300Kpa/4096 bits or 0.0732421875 kpa/bit (73.2pa/bit)

                x = ( (0.0732421875 kpa/bit * Raw Value bit) - 100Kpa)
                x = ( (0.0732421875 kpa/bit * 3287 bit) - 100Kpa) = 140.7Kpa

                For the 16 bit parameter this gives a kpa resolution of 300Kpa/65536 bits or 0.00457763671875 kpa/bit (4.6pa/bit)

                x = ( (0.00457763671875 kpa/bit * Raw Value bit) - 100Kpa)
                x = ( (0.00457763671875 kpa/bit * 52600 bit) - 100Kpa) = 140.8Kpa

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                • K
                  Kenzo @robski
                  last edited by

                  @robski I sent an email to M5Stack Support about the possible issue with the Tab5 and Tube Pressure sensor BUT no response so far....

                  kurikoK 1 Reply Last reply Reply Quote 0
                  • kurikoK
                    kuriko @Kenzo
                    last edited by

                    @Kenzo
                    This is an ADC problem. We are fixing UiFlow2 codes. Please be patient.

                    Good morning, and welcome to the Black Mesa Transit System.

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                    • K
                      Kenzo @kuriko
                      last edited by

                      @kuriko Thanks Kuriko for responding and taking a further look into the issue! Looking forward to testing out the updated version of UiFlow with the fix!

                      I will now wait quietly and patiently while your team works on an ADC fix.

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                      • K
                        Kenzo @kuriko
                        last edited by

                        @kuriko Just finished testing the latest release of UiFlow (v2.3.2 ).

                        The Kpa readings was better this time but the accuracy is not there yet... See attached photo.

                        Hopefully the next release will improve the accuracy of the Tube/Air sensor and Tab5...

                        VoltageReading_2.jpg

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