Arduino parallax ultrasonic sensor with icomsat sim900


hi
i wanted make using arduino uno , parallax ultrasonic sensors , icomsat sim900 gsm / gprs shield. wanted @ distance above 100 centimeters send message phone , @ distance of less 5 centimeters send message. i've made ??the code send message continuously. if wants me making program grateful

some code previews helpful.


but send message continuously.

this part confuses me. please elaborate? part of issue need with??
and distance of 5 or 100 centimeters what? floor? phone? other object?
are interested in sending messages when sensor @ 5 or 100 centimeters object?
is there tolerance in measurement (eg. ±0.1cm)?


if wants me making program grateful

i'm sure there plenty of people here glad assist. bit more information needed.

good luck!


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