Edge and obstacle detection on a small table

[richiereynolds]

Tinged with danger ...

[youtube]Sj2SRHVrh5s[/youtube]

[aruna1]

Hi,good work
i did some thing similar sometimes back,(but wasn't advanced as yours)

http://www.societyofrobots.com/robotforum/index.php?topic=9792.0

[richiereynolds]

That's excellent, love the lights, looks like a formula 1 car in the dark, just a bit slower 

[amadord]

You just pointed the photoresistors to the bottom  that way it will detect the shadows is that right?

[richiereynolds]

I did do it like that originally but then it depended on the colour of the table and it could be easily fooled by a window on one side of the room. You can get round it with a bit of calibration but it's still a bit haphazard and environment dependent.
In the end I used 2 short range digital IR scanners pointed down, when they point off the end of the table they don't detect anything.

[aruna1]

i guess i set pwm to about 40% when filming the video