Automated Altimeter?

[tipc]

Hi everyone, I am attempting to build an Automated Altimeter for a radio control aircraft (helicopter/hovercraft) and i was in need of some advice.

Should i:

A. Use an IR transmiter and reciever circuit.

OR

B. Use an Ultrasonic Distance Sensor (Like car reverse warning circuits)

Any help will be welcomed.

Thank you.

 

[tansis]

Sharp make an infrared rangefinder package that may do the trick..

https://www-2.cs.cmu.edu/~personalrover/PER/parts/slides/IR rangefinder.html

the Sharp GP2D12 module may also be worth looking at