Arduino location

What is the best way, or is there a way to find where the Arduino is in relation to maybe an another Ardunio ? GPS wouldn't be accurate enough for inside a house navigating a robot from its current position to position B.

If one arduino is stationary, then it can be used as a beacon for the moving one, similar to the solution implemented by Roomba (the vacuum robot).

Yea thats what im going for but how do i do that?

Infrared beacon:

anything else? ill look into the ir thing

anything else?

  • cameras (sensitive to different colored markers)
  • (unique) RFID tags spread around

Sonar? The ping sensor?

We are using the PING sensor so it doesnt hit objects i guess the rfis tags could would the thing is trying to make it move around the entire house getting from point a to b quickly