[电子设计精品] 基于MSP430F4260点光源跟踪系统设计.doc

基于MSP430F4260点光源跟踪系统设计报告
摘要
本方案采用程控恒流源来驱动LED灯,INA270A测量电流,光敏三极管作为传感器采集光强信号,采用双轴舵机作为驱动执行机构,实现了点光源的全方位三维立体跟踪,,两路PWM输出用于驱动两个轴上的电机,分别采用两个光敏三极管作为两个轴方向上的差动输入,有效抑制了环境光的影响,经A/D采集输入,逻辑判断,控制两个舵机动作,确保点光源位于四个光敏三极管正对的中心,实现了快速,准确,全方位跟踪的目标.
关键字: 恒流LED 光敏三极管舵机 INA270
Abstract
The LED lights is driven by programmable constant current source,
measuring current by IN270A,collecting the light intensity signals by phototransistor, using a biaxial servo actuator to realize the full range of electrical light three-dimensional tracking, choosing TI's MSP430F4260 as the processor. D / A output controls LED light intensity, two motors on axi-x and axi-z are driven by two PWM outputs, each one with two phototransistors that were used as two differential inputs, inhibiting the effects of environmental light effectively, via A / D acquisition input, logic to judge, control two servo action to ensure that the point source is on the centre of the four phototransistors, achieving tracking of target fastly, accurately prehensively.
Keyword : Constant Current LED phototransistor steering INA270
系统整体设计:
二、方案论证:

方案一:,°,且控制简单,,不易用两个做成双轴形式,只能实现二维平面上的跟踪,当沿直线移动点光源时点光源会脱离光敏三极管组成的斜面,造成跟踪误差.
方案二: TowerPro ,,控制起来也很方便.
所以本作品采用方案二.