Secure hash function and AES

Hello everybody,
I need a secure, but easy to calculate hash function for wireless
sensor network. I may using AES128 and a random number generator. My
idea to valuate H(x) is :
- initialize the random generator with x and generate a number r;
-Calculate x XOR r;
-Encrypt x with key x XOR r.

Do you think this will be secure? It's easy to find some flaws or some
collisions?
Thank you everybody
LORENZO

.

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