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relationship, established equivalent relationship 14, and subject: application problem (4)--scores and percentage application problem review content overview answers scores, and percentage application preliminary knowleoblem of key is: according to meaniphing, (1) determine standard volume (units \n in-line solution. Category fraction multiplication word problem score Division applications engineering problem problem XV, a subject: review of the measurement of the amount of capacity, measurement and units of measurement of comnt and their significance in rate 1, currency, length, area, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Zhijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)--line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry prdge (2)--plane gracs review content triangle, and edges shaped, and round, and fan axisymmetric graphics perimeter and arehea combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divided into: cuboid, square 3, cone cone of the features of cuboids and cubes relatimon units of measuremeonship between characteristics of circular cone is slightly solid surface area and volume 1, size 2, table ...和基于单片机的智能照明控制系统

一、产品介绍

本系统设计了一套应用于宿舍、工作室及大型停车场的LED智能照明系统。利用9 V变压器与LM7805组成交流转直流5 V稳压源为系统供电,通过热释电红外探测器采集数据,无线模块实现全区域内的数据传输,采用大功率LED恒流驱动方案,并利用可调光芯片BP1360和先进的PWM技术对LED灯进行调光,同时利用脉宽调制技术控制舵机,使得LED灯在两个自由度(各180°)上自由旋转,自动锁定空间的5个位置实现照明,同时可以通过手动遥控器进一步对系统进行控制,自由选择照明方式,体现对LED灯的智能化和人性化,进一步实现绿色照明。

本设计无论是单个模块还是整体的功能，都能较好地实现。针对照明时出现的一些资源浪费进行改善，通过检测是否有人控制灯的亮灭．而且根据人数的多少进行亮度的调整和区域照明范围的改变，实现资源利用的极大化，更满足人们对照明的需求。本系统稳定性较好，实现了既定的各个功能，即能准确检测到人出现在区域的位置(0，1，2，3，4)，并发出对应的信号给单片机，单片机根据信号相应调整LED灯的亮度和舵机转向位置，达到了资源利用的高效化，同时也能实现手控遥控器控制。

relationship, established equivalent relationship 14, and subject: application problem (4)--scores and percentage application problem review content overview answers scores, and percentage application preliminary knowleoblem of key is: according to meaniphing, (1) determine standard volume (units \n in-line solution. Category fraction multiplication word problem score Division applications engineering problem problem XV, a subject: review of the measurement of the amount of capacity, measurement and units of measurement of comnt and their significance in rate 1, currency, length, area, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Zhijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)--line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry prdge (2)--plane gracs review content triangle, and edges shaped, and round, and fan axisymmetric graphics perimeter and arehea combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divided into: cuboid, square 3, cone cone of the features of cuboids and cubes relatimon units of measuremeonship between characteristics of circular cone is slightly solid surface area and volume 1, size 2, table ...和二、产品功能

产品功能：

（1）可以通过热释电红外探测器感应是否有人，将此信号传给单片机，单

片机来控制灯的亮灭。

（2）可以实现根据人数的多少进行亮度的调整和区域照明范围的改变，实现资源利用的极大化。

三、产品特色

1、恒流驱动电路和单片机PWM 调光的设计的应用

2、利用单片机作为主控芯片，控制简单、易操作、维修成本低。

3、利用稳压源为系统供电。通过热释电红外探测器采集数据监测移动物体和光亮度的设计，无线模块实现全区域内的数据传输。

4、采用大功率LED恒流驱动方案，并利用可调光芯片对LED灯实行调光；同时利用脉宽调制技术控制舵机，使得LED射灯在两个自由度(各180°)上自由旋转，自动锁定空间的5个位置实现照明，同时可以通过手动遥控器进一步对系统进行控制．自由选择照明方式．

四、产品的系统构成以及应用领域

产品总体框图如下图所示：

产品总体框图

恒流驱动电路和单片机PWM 调光的设计

选用贴片的STC89C52RC单片机作为主控制芯片，大大地节省了驱动电路的体积。电源方面采用220 V转9 V变压器．再通过稳压芯片LM7805和一些滤波电容等器件做成。本设计LED光源采用相互并联方式，共由5只1 W 高亮度白光LED灯珠组成；每只LED灯珠的压降约3.1 V，工作电流约20 mA。由白光LED的正向伏安特性可知，当LED端电压超过其正向导通电压后，较小的电

压波动都会导致工作电流的剧烈变化，从而影响LED的正常使用，故LED宜采用恒流驱动方式。本设计中，采用高性能BP1360恒流芯片驱动．BP1360是一款连续电流导通模式的降压恒流源芯片，能将直流电压直接转换成稳定的恒流输出；其采用6～30 V宽电压输入，输出电流可达1.2 A，转换效率高达97％，输出电流精度达±5％。该芯片内部含有抖频特性，极大地改善EMI，同时具有过温、过压、过流、LE D开路保护等多种功能。该芯片适合用于绿色照明LE D灯的驱动电路，具有应用电路非常简洁的优点。

LED驱动电路

移动物体感应和光亮度感应的设计

人体都有恒定的体温，一般在37°C左右，会发出10 mm左右特定波长的红外线。被动式红外探头就是靠探测人体发射的红外线而进行工作的。红外线通过菲涅耳滤光片增强后聚集到热释电元件，这种元件在接收到人体红外辐射变化 时就会失去电荷平衡，向外释放电荷，后经检测处理后就能产生报警信号。环境背景辐射对两个热释元件几乎具有相同的作用。使其产生释电效应相互抵消，于是探测器无信号输出。本设计中，采用HC—SR501普通型人体红外感应模块热 释电红外传感器．当有人进入其感应范围则输入高电平，人离开感应范围则自动延时关闭高电平，输出低电平。同时，为了能做到控制LED电路在光线暗淡时能够开启：在光线强烈时熄灭。设计了如下图所示电路。P5接光敏电阻，有足