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ultrasound device

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yvesfra

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Hello everybody,

I am looking for a circuit that can alert me if my daughter, while she is playing outside, get too far.

I am thinking to use ultrasound. A device *A* that send a ultrasound signal and a device *B* answer with ultrasound when it get the signal signal from *A*. The distance can be calculated when the device *A* receive the signal back from the device *B*.

I have no time to create everything from scratch and I am wondering if somebody can help to find some electronic schema ready to use or with only some adaptations. Obviously, the device *B* need to be small. I Google a lot and search this site also without finding anything.

Thanks in advance.
 
Yes, a ready made device would make FAR more sense (and it needs to be RF not ultrasonic) - you also need to be aware of the limitations of such devices, accuracy is low, and false triggers common.
 
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