Xiaomi Mi Scale 2 get all properties

[vanlooverenkoen]

For now this package only supports getting your weight

This is also supported by the scale. Is there a way to get these values as well?

• Body fat percentage
• Muscle mass
• Water percentage: average 65 % in adults.
• BMR (Basal Metabolic Rate): metabolic rate that represents the amount of energy the body needs per day at complete rest.
• Visceral fat: fat that surrounds the internal organs.
• Weight of bone mass
• BMI (Body Mass Index): indicates whether you are normal, underweight or overweight.
• fat-free body mass
• Protein percentage

https://dev.to/henrylim96/reading-xiaomi-mi-scale-data-with-web-bluetooth-scanning-api-1mb9

https://github.com/wiecosystem/Bluetooth/blob/master/sandbox/huami.health.scale2/body_metrics.py

[BeMacized]

I figured the conversion to get these values from the impedance value would have been some black box algorithm on Xiaomi's part, so I never really considered looking into it. If that algorithm in the 2nd link works for this scale as well, that does make things a lot easier.

Currently I'm not interested in implementing this due to time constraints, but I'll gladly merge a PR.

I have a hunch that the impedance value might be stored in bytes 9 and 10 of the advertisement data.

[vanlooverenkoen]

Because we only need 1 number for the calculation: BIA (Bioelectrical impedance analysis) https://en.wikipedia.org/wiki/Bioelectrical_impedance_analysis

https://github.com/oliexdev/openScale/blob/390fc410536a05f8308a49d23b397b6ba56f6129/android_app/app/src/main/java/com/health/openscale/core/bluetooth/lib/MiScaleLib.java#L23

I am trying to use this java class for parsing the extra fields

The only thing we apparently need is the impedance which is stored in here:

impedance = ((data[10] & 0xFF) << 8) | (data[9] & 0xFF);

This is what it looks like:

[vanlooverenkoen]

I compared the results with the results from the xiaomi app.

And this is exactly the same. So I think we can use this to get the extra data

[hmmunioz]

I need help the impedance value is always null and I can't get the other data can someone help me @vanlooverenkoen

[vanlooverenkoen]

@hmmunioz what scale are you using?

I only have a Mi Body Composition Scale 2 so I only tested that scale

[hmmunioz]

@vanlooverenkoen hi bro, I use the same My body composition scale 2, can you please share the complete project with me, because I don't understand why the impedance is still null, I don't know if I have a problem with the code, could you please send it to me

[vanlooverenkoen]

The example is the complete project. So you should be able to use the example. And that should not give you a null value.

[hmmunioz]

hoooooolly s***t, it worked friend, I add an impedance != null before return MiScaleData in MI_scale_device_v2.dart, and and modified proccesData for the same condition, waaaaaaaaaaa I'm very happy it's working, thanks genius @vanlooverenkoen . How complex is it to make a similar plugin for the miband6?