Connecting two ultimate robots

#1

Hello,

How can i connect two robots (e.g. follow each other in a straight line) ?

Thanks,
berlus

#2

Hello! I have a problem with uploading to arduino… Please help!!! This is what happens when I try to upload my program to my mbot:

My mbot starts running immediately although I typed in program to "wait until button pressed"
Pleasee help me!!! Thanks in avance!

#3

So long as they are only moving in a straight line you could use something as simple as an ultrasonic sensor on the rear robot to measure distance between them and speed/slow down accordingly.
If you need course correction then it gets more complicated

#4