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iBeacon calculate distance in meters
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| // Based on http://stackoverflow.com/a/20434019 | |
| function calculateAccuracy(txPower, rssi) { | |
| if (rssi === 0) { | |
| return -1; // if we cannot determine accuracy, return -1. | |
| } | |
| var ratio = rssi * 1 / txPower; | |
| if (ratio < 1.0) { | |
| return Math.pow(ratio, 10); | |
| } else { | |
| return (0.89976) * Math.pow(ratio, 7.7095) + 0.111; | |
| } | |
| } |
Why do you multiply for 1?
@philipgiuliani how did you get to txPower of -55 ?
This formula for iOS devices ? How is for android ?
This formula for iOS devices ? How is for android ?
@hadpro24 sorry I have no idea, I have used this function once in 2015 and have forgotten the context 🤷♂️
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@besi The TX power is not what you think it is. Its the dbm value at a distance of 1m (for calibration). You can also read it from an iBeacon when its correctly calibrated.
So in your case you have to call
calculateAccuracy(-55,-55)and you will get1,01mSo in your case you have to call
calculateAccuracy(-55,-80)and you will get16,27m