4WD Smart Robot Chassis Car DIY Kits With Magneto Speed Encoder For51

Features 1 20 line Speed Encoder more accurate than 6 or 10 one 2 The mechanical structure is simple convenient installation 3 The height between two chassis can be change by different copper pillar 4 The four turn speed dc motor flexible directional well Quad chronological horsepower Chassis and stability is very easy to extend5 The car comes with speed encoder cooperate with our speed of photoelectric can rapidly form a speed measuring system Can speed range form a closed loop system 6 The car with our four L293D motor driver module four way tracing module and 51 control unit seamless docking with red light expanded hole of obstacle avoidance composition system is concise and good looking Specifications Working Voltage DC 3V 5V 6VWorking Current 100 mA 100 mA 120 mANi load with wheel 100 RPM 190 RPM 240 RPMSpeed no load 20 m min 39 m min 48 m minNoise 65 dbWheel Diameter 66 mmSize L W H 25 5 x 15 5 x 6 5 cmPackage Included 4 x Tyre8 x Fastener4 x 20 line speed encoder2 x Smart car chassis Acrylic 4 x DC gear motor strong magnet testing by EMC 1 x Set of Screw Nut and Copper Pillar