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

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    • K
      Kenzo @Kenzo
      last edited by Kenzo

      So if I assume the ADC 12 bit option will give me 4,096 different points and the ADC 16 bit option will give me 65,536 different points maybe I can come up with a formula ( using the voltage - Pressure graph) of how to calculate Kpa when using ADC option for the Tube pressure... Everyone I am just thinking out loud so don't bash me too badly... LOL!

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      • robskiR
        robski
        last edited by robski

        what are RAW values you are getting from your sensor? pure analog read value?

        try below

        float raw = analogRead(sensorPin); // Read analog value
        float Vout = raw / 4095.0 * 3.6; // Convert to voltage (assuming 3.6V reference)
        float P = (Vout - 0.1) / 3.0 * 300.0 - 100.0; // Calculate pressure in kPa

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

        K 1 Reply Last reply Reply Quote 0
        • K
          Kenzo @robski
          last edited by

          @robski Thanks for replying! With nothing connected to the Tube pressure sensor, I am getting a RAW value of 3,287 (12 bit option selected in the ADC parameter).

          In regards to a 3.6V reference, where is that in the documentation?

          RangeSpan_1.jpg

          I think we are getting close to solving this problem!

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

            @robski - I stumbled across this youtube video about an Arduino Pressure Sensor and was thinking about testing a version of his method for coming up with a calculation...

            https://youtu.be/UrqPxwsPWGk?si=4Ho9CQwpoFZstMBk&t=321

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            • robskiR
              robski
              last edited by robski

              with your raw value as 3287
              sensor range -100 to 200
              analog range 0 to 4095

              your calculated pressure should be around 140

              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 0
              • 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

                      K 2 Replies Last reply Reply Quote 1
                      • 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.

                              K 2 Replies Last reply Reply Quote 0
                              • 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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