hi, Im a student and we're having a school project called human following pushcart, but we have no idea how to transmit signal to the pushcart for it to follow the human while walking.. can anyone give me some help?

 

Hello,

I found this thread in "the completed projects" forum, where it is rendered invisible.
I moved it over here as it is a school project and made it visible.

Can you tel us your efforts upto now?

Bertus

 

Im so sorry for what I have done, Im just a new member.. Anyway , as of now were still researching for other means on how the robot will follow the human.. but Im still curious about RFID will work on our project .

thank you for your reply!!!

 

i thought it was human following pushcart? now it is cart following human?
that is simpler, all you need is piece of string...

so i guess the cart is the 'robot' and you want it to follow the customer?
why do you need to transmit anything? you don't want to have onboard sensors and intelligence? why not use radio?

 

Search for "light seeking robot" and see how robots are made that follow or find a light source. There are lots of projects like that. Then in a mental exercise, replace "light" with "human", and some of the techniques may still apply!

 

RFID range is too short for something like this, unless you want the cart bumping into your heel as you walk.... using some form of Infrared beacon might be better.... person could have an IR transmitter, and the cart could have 2 IR detectors, one on each side of the cart, that way the cart can tell how far the person is from each side of the cart and then can correct its bearings to follow right behind the person and hopefully follow in a straight line.... of course you will need some kind of bumpers or sensors on it to detect a collision (better make it an obstacle detection system, so you do not have to bump into it to find it, better to avoid a collision before it happens rather than after it happens) that way if the person is too far ahead, the cart could "catch up", or if the cart gets too close, then it can slow down.....

 

Hello,

There is also RFID in the 433 Mhz band.
That has a range from 1 to 100 meters.
See this page of the wiki:
http://en.wikipedia.org/wiki/Rfid

Bertus

 

thank you for all your replies!! It really gave an idea ..