Robot Follow Project

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hello,
i trying make rolling backpack can follow user around wirelessly. idea youtube.com/thebenheckshow. parts have follows.
2 arduino unos
3 hc-sr04 ultrasonic range finders
2 motors
1 motor shield
i have hooked should facing problem. no matter try, can not ultrasonic sensors communicate each other. 1 sensor hooked arduino , ping. other 2 sensors hooked other arduino , try listen ping. did not plug in trig pin because supposed receiving. need problem , need finding lightweight "backpack" guidance appreciated.
thanks

the below might of interest.

http://revision3.com/tbhs/robotluggage


Arduino Forum > Using Arduino > Project Guidance > Robot Follow Project


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