Triobot is a very simple robot constructed using Lego bricks 2 motors and one light sensor and its programmed using NQC language.  Triobot is able to detect its own path. It will detect any obstacle before it struck to that obstacle and it takes turn and tries to find new path.

Robo Arm is an intelligent arm which can detect object lying under its sensor. Once it detects the object it picks up that object and drop it at some different location. This Robo Arm uses Lego 2 motors (one for vertical movement and one for horizontal movement), one light sensor and two touch sensors and it is programmed using NQC language.

I designed this tank with 2 touch sensors and 2 motors. This robot can detects obstacle by front touch sensor and then  it backs up. While backing up it lifts its rear wheels by pressing backside arm so it can turn. This is very kool feature which I implemented after many design considerations.