iphone - Android/ iOS how to determine small changes in distance using sensors? -


i have been doing bit of research, cannot seem find way determine small distances (centimeters , meters) using sensors in android or ios devices. bluetooth appears inaccurate , require more 1 device, gps works on larger variations in distance, , small variations in rotation seem make using accelerometer impossible.

is there method unaware of allow me such thing? familiar calculus, using integrals determine distance based on changes in time , velocity/ acceleration not problem me, not know how determine things.

thank you.

there's no sensor in these devices able give desired accuracy without exterior help.

if use case allows bit of external setup, here ideas:

you use camera , computer vision calculate device movement. could, example, use artoolkit measure distance visual tag fixed wall. in close distances can pretty high accuracy (mm) using technique.

another idea measure distance solid object, wall, emitting short audio signal using speaker , measure time until echo arrives @ microphone. more of research project, though.


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