Proximity sensors on a quadcopter

If I want to connect proximity sensors, one for each rotor to detect objects sideway, one on top and one on bottom, how many ports do I need? Can they be read on a multiplexer fashion? Are they connected on the autopilot or on the FC? Do they (Ardu hardware) have enough free ports to accommodate this configuration? Thanks for your help and opinion.

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  • I think u need 1 analog port per sensor but i could be wrong.  Well unless they are I2C.
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