The motor was controlled by a two-channel relay board. The crane was controlled by a Hitech mg485 servo that had been modified to be a DC motor. Once code was created, the driver servos and the stabilizer servo could be controlled directly from the ports of the Arduino USB Host shield. The dongle was then connected to the Arduino USB host shield, which was stacked on a regular Arduino UNO. For the electronics and controls, a wireless Play Station 3 controller was chosen, that connected to a Bluetooth dongle. The stabilizing arm was used to make sure the car didn't flip forward when the weight was being deposited or picked up from across the gap.Ī Hitech 311 servo was fastened to the stabilizing arm. At the end of the crane fork there was a very small wire used to pick the weight up. Both the crane and stabilizing arm were made of carbon fiber. The main crane arm was also 3D rapid prototyped. Wheels for the car were designed in Creo and were 3D rapid prototyped. The drive servos chosen were tower pro mg995 because of metal gearing and high torque. The drivetrain consisted of tank style steering. The chassie was built using some sheet and angle aluminum.
The car had to then maneuver back through the course to the finish. The car then had to pick up another weight across the gap and transport it back down the incline and drop it off. Once at the top, the weight was set in a cup across a ten inch gap. It had to navigate a course, then pick up a half a pound weight carry it up a thirty degree incline. This project was built for a competition, to compete against similarly designed cars.
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