Ultrasonic sensors

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hi,
how many ultrasonic sensors can connect arduino mega 2560 ?
i making r2d2 unit , put on around 15 ultrasonic sensors.
do have enough pin connection on arduino mega 2560 ?
if not how should wire them arduino mega 2560 ? (maybe in serie)
on ultrasonic sensors description said max 15 degree, direction in meant (x,y,z)?
thanks

how many? should no problem 15. mega has plenty of input pins handle type of ultrasonic sensor. if hit limit can extend number of input pins cd4051 multiplexer.

the 15 degree angle xy angle. think of cone (with 15 degree tip) pointing @ sensor.


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