| dc.description.abstract | In this thesis, we design and implement an automatic car with sensing and wireless communication capabilities. With the sensing devices, we can remote control the automatic car under the dangerous environments. The sensing devices include CCD camera, ultrasonic ranging sensor, humidity sensor, temperature sensor, and electronic compass. The automatic car cannot only control manually but also can navigate and avoid obstacles automatically. In our research, we equip the wireless sensor node on the automatic car to broaden the applications of wireless sensor networks. The control mechanism of the car consists of high-level controller and low-level controller. The single board computer is used as the high-level controller and Basic stamp is used as the low-level controller. Our design is hierarchy in different layers. In the upper layer, the controller can communicate with the wireless network; on the contrary, the RS-232 interface is controlled by the low-level controller. The USB port can be used to connect other devices. Low-level controller can master the electronic signal transmission in physical layer. We use a Basic stamp as a main microcontroller to control other three different microcontrollers and these three devices are used to control the electronic components in the bottom layer. The automatic car not only can be controlled through wireless network, but also can cruise navigation in long distance and auto-avoid obstacles for not damaging car body. There are three ultrasonic sensors are installed in front, right and left side of the car, when one of these sensors detects obstacles, it would auto-avoid obstacles immediately. Besides, the automatic car can receive the sensing data from sensor nodes and then forward to sink node through the wireless communication. | en_US |