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I call this robot Explorer :) This can decide its own path using SRF05 ultra sound sensor. Its primary path is going forward, but if it finds obstacle within 20cm distance, it checks right and left. By comparing the distance of the obstacles in both right and left (if present) it decides its path. A 16x2 LCD has been used to display the information about what the robot is doing. The brain of this robot is an Arduino Mega 2560, I know same thing could be done using the UNO or just the ATmega8. But ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/obstacle-detector-ultrasound