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Following Robot

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mlt57sooner

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I am trying to get a robot to follow a human using only ultrasonic sensors. I trying to send out a signal from the robot and have a reciever on the human get the signal and then send out a reply signal to the robot. how can i encode the signal from the human so that the robot knows that the signal came from the human? Does anyone know of good ultrasonic sensors to use?
 
morse code , rather than just ping the output once and wait for a reply
send a series of output pulses with different intervals that uniquely identifies the bot.
 
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