Autonomous Homing Robot
This robot homes in on a selected radio transmitter by finding the direction of the signal.
Basically, if the signal hits one of the two antennas first, digital noise is created. If the signal hits both antennas at the same time (when the robot is facing the transmitter) there is silence.
A microcontroller interprets the noise to determine which direction the radio waves are coming from, then drives the robot towards them.
To learn more about how it works, see my Science Fair Project
Build this robot with step by step instructions!
The Radio Direction Finding (RDF) method I use in this project is also detailed here at Joe Leggio’s site.