Multiranger returns None

[rittmaierfe88977]

Hi community,

i am running a simple python script to test out the decks on the crazyflie. For the multiranger i wrote a simple script that just prints out the distances of each direction. This is the output of my code:
1 Flow Deck is attached! 1 Multiranger Deck is attached! [None, None, None, None] [0.326, 0.591, 0.888, 0.751] [0.321, 0.584, 0.886, 0.752] [0.323, 0.572, 0.884, 0.751] [0.324, 0.573, 0.885, 0.751] [0.321, 0.571, 0.886, 0.75] [0.325, 0.569, 0.885, 0.751] [0.326, 0.565, 0.886, 0.75] [0.323, 0.563, 0.884, 0.751] [0.325, 0.569, 0.887, 0.747] [0.322, 0.566, 0.887, 0.747] [0.323, 0.563, 0.885, 0.747] [0.325, 0.568, 0.89, 0.747] [0.324, 0.575, 0.892, 0.747] [0.326, 0.575, 0.89, 0.744] [0.325, 0.578, 0.886, 0.745] [0.325, 0.582, 0.884, 0.745] [0.324, 0.58, 0.887, 0.746] [0.312, 0.601, 0.875, 0.743] [0.291, 0.602, 0.862, 0.691] [0.23, 0.596, 0.83, None] [0.201, None, 0.781, 0.26] [0.182, 2.954, 0.698, 0.257] [0.179, 2.798, 0.624, 0.264] [0.158, 2.959, 0.542, 0.274] [0.144, None, 0.442, 0.298] [0.134, None, 0.398, 0.304] [0.123, None, 0.366, 0.319] [0.116, None, 0.342, 0.336] [0.127, None, 0.34, 0.354]

And I wondered why some of the ranges are None? Is this intended?

[tobbeanton]

It might be that you didn't get a valid reading from the sensor?

[rittmaierfe88977]

i have not worked with sensors like this. So this happens regularly?

[tobbeanton]

Yes, when the distance get to far it will not get a reading