A capacitive sensor assembly for a robot to prevent damage to the robot when it moves in an undesired manner is disclosed. The thin film transistor includes a substrate; a semiconductor layer pattern which is formed on the substrate, the semiconductor layer pattern having a channel layer of which no seed exists and no gram boundary exists; a gate insulating film formed on the semiconductor layer pattern; and a gate electrode formed on the gate insulating film. 5%, in relation to the overall weight of the briquettes, and the briquettes have a specific weight of 1,500-5,000 kg. The system may also have a controller operably connected with the tool control valve and the pump.