built by Koh Seah Wee

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Target Environment Locomotion Method
Indoors 3 Wheels
Sensors / Input Devices Actuators / Output Devices
3 paris of Ultrasonic sensors
Two stepper motors
Two DC motors for gyroscope
Ball collector
Control Method Power Source
Autonomous Battery
CPU Type Operating System
Motorola HC11 None
Programming Lanuage Weight
Time to build Cost to build
9 months A$ 600.00
URL for more information
Built by 1) Koh Seah Wee 2) Tseng Zu Hui 3) Ng Hong Wei.

This autonomous robot is designed to collect tennis ball on court. It is fully self-contained without human intervention.


1) Collect tennis balls with self-made mechanism.
2) Unload tennis balls to pre-defined location.
3) Microcontroller controlled, self-contained.
4) Ultrasonic sensors for obstacle avoidance.
5) Self-built GYRO system for navigation.
6) Wheel-chair configurations for robot movement propelled by two stepper motors.

Parts Used:

1) Cheap aluminium frame
2) 2xStepper motors
3) Used Printer paper loader for ball collecting
4) Motorola M68HC11 microntroller chip.
5) 3xpairs of Ultrasonic Sensors.
6)GYRO - two dc motors to propel two disks(inertia) and mounted on a 360 degree pot.


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