This robot uses only 4 linear micro servos, an arduino nano, a bluetooth transeiver two lipo battery’s in order for it to work. The goal of this robot was to keep it as simple as possible but remain the most important movements. This robot uses 4 micro servo’s salvaged from old and broken indoor rc-planes and helicopters. these servo’s are controlled by an arduino nano and powered by two 1 cell 200mAh lipo battery’s. To control the movement of the robot I use a Bluetooth transeiver connected with an android device. This allows me to make the robot go forwards, backwards, turn left and turn right. In the download link you can find a video and some pictures so you can see how it works.”

Link