Cytron Technical Forum

firstly i'm really sorry if my posting are not at the suitable place.
I want to do autonomous trolley robot that can follow human back at the constant range.
What is the suitable sensor that i should used in term of price and percent of successful??
Hope anybody can help me.. thank you so much.

hi,

http://www.youtube.com/watch?v=buZJlwoJW6o
http://www.youtube.com/watch?v=tNWwnRYSULE&feature=related


regards,
yh

Your robot needs to be able to "seek out" the human by looking for signatures. This could be done by (in ascending order of "invasiveness" and price):

1. Machine vision - Detects and follow any humanoid object. If your bot runs LabVIEW this is probably the best solution. Camera: RM400. EEEPC: RM1000. LabVIEW: Academic license.

2. RF pinging - Your human subject needs to carry an RF transmitter. Your bot will receive the RF ping signal through at least 3 directional RF antennas, triangulate his direction and find him! RF xmitter: RM25, 3x receivers: RM75. Microcontroller: RM35.

3. visible light/IR pinging - Similar to 2. but instead of RF, you will use visible light or infrared. Good luck maintaining a line-of-sight btwn the transmitter and receiver though =)
High power IR LED: RM5, 8 phototransistors RM16. Microcontroller: RM35.

Have fun!

@lordtct

can tell us more about the third method? how to calculate the direction? why 8 phototransistors? any article you can suggest me to read more about this method?

thanks...

Hi there,

This project just as simple as using an ultrasonic range finder to make sure trolley is always a constant distance from you.

There is a lot of circuit about ultrasonic range finder even module also a lot.