ir object detection

[shank_satyamite]

hi guys,
i am new to robotics.i wanted to make a robot for competition.i need to detect an object coming to me and give a signal,just like a buzzer or something.i think i need to use ir sensors.plz help me with this.i wud be happy if i get some ckt diagrams and how to write the programs???

[Steve Joblin]

Please read this post... http://www.societyofrobots.com/robotforum/index.php?topic=1480.0

...then this post... http://www.societyofrobots.com/schematics_infraredemitdet.shtml