外文翻譯--基于微控制器的光控制器(英文）

1、International Journal of Software Engineering and Knowledge Engineering Vol. 15, No. 2 (2005) 319-324 © World Scientific Publishing Company MICROCONTROLLER BASED LIGHT CONTROL MOHAMMED RAFIQ UDDIN Faculty ofCS L

2、DR; decoder; sensor; controller; PEROM. 1. Introduction Nowadays microcontroller-based system is one of the major concerns for many scientists and engineers. A microcontroller is a device which can control a system autom

3、atically according to the given instruction (or program). Our microcontroller-based system helps civilization in maintaining an advanced and comfortable life. The output of the system can control four low watt lights whi

4、ch are turned on/off according to the intensity of lights incident to the room. Therefore the system can control the room lights automatically instead of manual switching. It is basically designed for home application. I

5、t might also be helpful for industrial organization and for protecting sensitive materials. 319 V f e World Scientific w b www.worltlscientific.com Int. J. Soft. Eng. Knowl. Eng. 2005.15:319-324. Downloaded from www.wor

6、ldscientific.comby SHANGHAI JIAOTONG UNIVERSITY on 05/01/16. For personal use only.Microcontroller Based Light Control 321 2.2. Controller unit The microcontroller coordinates all operations of the system. We will use A

7、TMEL AT89C52 Microcontroller for controlling them. The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8K-bytes of Flash Programmable and Erasable Read Only Memory (PEROM). The Microcontroller has

8、four ports PO, PI, P2, and P3. These ports make use of General Purpose Input Output (GPIO) mode functionality . Here we have used PO as input port and P2 as output port. Firstly, the microcontroller reads the 8-bit digit

9、al data from the transceiver. Three bits of port 2 (pin number 22, 23, and 24) are used for controlling output. Port 2 pin number 21 has also then used for controlling and synchronizing the system. For getting stable dat

10、a from surroundings, the system will read data after every specified interval of time. 2.3. Output unit The output unit is a complex combination of decoder, logic gates [6], transistors and relays. The decoder which is d

11、irectly connected to the microcontroller decodes the output signals from the controller to the combinational circuit. The inverter is used to change active low output of decoder to active high. The OR gates combination i

12、s designed to result us four output function which are used for four lights correspondingly. When any output function is High (Low), the corresponding light will turned On (Off) respectively. When intensity of sunlight i

13、s low, the controller sends high selecting bit to decoder so that the numbers of active output functions increase and vice versa. The complete circuit diagram of output unit is shown in Fig. 2. The numbers of lights that

14、 are turned on/off with respect to the controller output are per shown in Table 1. The transistors are used for V) zzo' Fig 2. Complete circuit diagram of output unit. Int. J. Soft. Eng. Knowl. Eng. 2005.15:319-324.