RF remote controlled robot.

[sri krishna yadav]

How can i find the distance between two controllers (arduino) using RF module. I used RF transmitter, keypad and arduino to make a remote, to control the robot. my plan is to interface a LCD to the remote and display how far the robot is, from the transmitter. please help

 

[Jestin_cubetech]

With The Help Of Ultrasonic Module and RF Module.
Transmitter
1, Start RF Transmission
2, Activate Ultrasonic Transmitter Module

Receiver

1, Set Timer After Receive Rf Transmission
2, Wait until Ultrasonic Pulse Arrived
3, if Ultrasonic pulse present, read Timer Count and stop timer.
4, timer count is proportional to the distance.

 

[sri krishna yadav]

will it work without line of sight between transmitter and receiver?, i need to get range upto 20 mts. can i get with this arrangement?