@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...

Has anyone found a better alternative to the M5Stack's Air Tube Pressure sensor?

The current Unit Tube Pressure (SKU:U130) appears not sensitive enough to detect someone lightly blowing into the tube. Also it doesn't have an I2C interface. I did find a Micro Pressure Sensor tube sensor with an I2C at SparkFun's website BUT it needs an input voltage of 1.8 to 3.6V to work so it's not a direct plug into M5Stack's I2C grove port.

So if anyone has found a better alternative to M5Stack's TUBE Pressure sensor with an I2C interface that can directly plug into M5Stack's I2C grove port, please let me know. Thanks!

Tab5 Screen Protector

Not exactly sure where to post this BUT over the weekend I created a simple screen protector sheet design for the M5stack Tab5.

I laser cut the design out onto a sheet of screen protector.

I have exported the design out into multiple file types ( .svg, .dxf, .ai, .lbrn2) so hopefully one of four file types will work for people who may be interested in making a screen protector for their Tab5.

Just be sure to be careful and take the necessary precautions when dealing with the fumes when cutting material with a Laser Cutter...

Github Link to design files: https://github.com/KenzoWright/M5Stack_Tab5_Accessories
Screen Protector sheets I used: https://amzn.to/4flH2PM

Also if anyone knows of a I2C Micro Tube Air sensor that has successfully worked with the Tab5 please send me a message. I am searching for a Tube Air sensor that can detect if someone blows over a tube or lightly into it.

I have tried using M5Stack's Tube Air Sensor ( SKU: U130 ) but I am having issues getting it to work with the Tab5 and I don't know if that sensor will be sensitive and accurate enough to detect someone lightly blowing into the tube. So the sensor will have to be sensitive and accurate as well as compatible with the M5Stack’s I2C implementation with the 5 volt power supply…

Thanks and I hope the community finds the screen protector useful!

@scroggyg Thanks for the suggestion! I didn't think of that. I will put that as an option if no one knows what type of wired connector to use... Hopefully someone knows where to find one...

Also if you are looking for a screen protector for your Tab5, I created a simple design over the weekend and laser cut it out on a sheet of screen protector.

I have exported the design out into multiple file types so hopefully one of four files will work for people who may be interested in a screen protector for their Tab5.

Just be sure to be careful and take the necessary precautions when dealing with the fumes when cutting material with a Laser Cutter...

Github Link to design files: https://github.com/KenzoWright/M5Stack_Tab5_Accessories
Screen Protector sheets: https://amzn.to/4flH2PM

Has anyone found a better alternative to the M5Stack's Air Tube Pressure sensor?

The current Unit Tube Pressure (SKU:U130) appears not sensitive enough to detect someone lightly blowing into the tube. Also it doesn't have an I2C interface. I did find a Micro Pressure Sensor tube sensor with an I2C at SparkFun's website BUT it needs an input voltage of 1.8 to 3.6V to work so it's not a direct plug into M5Stack's I2C grove port.

So if anyone has found a better alternative to M5Stack's TUBE Pressure sensor with an I2C interface that can directly plug into M5Stack's I2C grove port, please let me know. Thanks!

@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...

@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.

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

@Maethaxi Thanks I was looking for a Tube/Air Pressure unit with a I2C interface... I was trying to use the M5Stack Tube/Air Pressure Unit but I am running into an issue so I figured I would look for other options if I can't get it to work accurately... I need a sensor sensitive enough to detect someone blowing lightly in a tube....

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

@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...

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