Anyone try to make a bot that can chase another bot?
I was thinking one bot would transmit infrared (a beacon) and the other would receive it. IR remotes work well for 10-20'. While I've only got that too work from 6' using a receiver like a tsop2438, that is for another thread.
The question here is how to find the direction of the transmitter. IR receivers either respond or don't respond. I was hoping a photodiode or IR detector like http://www.sparkfun.com/commerce/product_info.php?products_id=241 could provide an analog value that would indicate signal strength. The sender would broadcast regularly. But when I tried it with a photodiode, it's maximum range was about 6 inches. Another thread on Arduino Forum indicates the Sparkfun IR detector also has a short range.
Any ideas for a beacon-detector pair that would work from 6-20'? Again, the detector needs an analog signal that indicates 'hotter' or 'colder' as the receiver changes direction or gets closer.