摘 要：调查数据表明，我国半数以上青少年不懂得提前预防及治疗近视，因而多数视力 低下的学生并未采取有效的矫正措施。针对此问题，本论文设计了多功能视力保护器。多 功能视力保护器主要包含辅助坐直、感光、记时和报警四大功能。其中辅助坐直报警电路 由水银滚珠重力传感器作为触发电路，当使用者坐姿不正时，传感器触发电路工作，报警 提示使用者纠正坐姿；感光电路通过光敏电阻感知使用者周围光线强弱，如果光强不足则 由发光二极管闪烁提示；记时模块能实现对学习时间进行计时并通过报警电路来提示时间 已到，从而提醒使用者注意科学用眼。经仿真测试，本设计性能良好。74460

毕业论文关键词：视力保护器，传感器，记时，报警

Abstract: Survey data shows that more than half of teenagers do not know how to advance prevention and treatment of myopia, and most of the students did not take effective and corrective measures。 In view of this problem, this paper designs the multifunctional vision protector。 Multifunctional protector contains four functions, including auxiliary sat upright, sensitization, timing and alarm。 The auxiliary sit straight alarm circuit uses the mercury ball gravity sensor as a trigger circuit, when users sitting posture is not correct, the sensor trigger circuit, alarm prompt the user to correct the sitting posture。 Photosensitive circuit uses the photosensitive resistance to perceive the light intensity around the users, if the light intensity is insufficient, hinted by LED flashing。 Timing module can realize the time to learn timing and through the alarm circuit to suggest that the time has come to, so as to remind the user pay attention to the science with the use of eyes。 Through simulation test, this design has good performance。

keywords: vision protector, sensor, timing, alarm

目 录

1 前言 4

1。1 背景 4

1。2 视力保护器的发展状况 4

1。3 论文内容概述 5

2 总体设计方案 5

2。1 系统总体设计 6

2。2 单片机的选择 7

2。3 传感器的选择 8

3 系统硬件设计 8

3。1 单片机最小系统 9

3。1。1 8051 单片机 9

3。1。2 振荡电路 11

3。1。3 复位电路 11

3。2 电源电路设计 12

3。3 传感器辅助坐直电路设计 13

3。4 光强报警电路 14

3。5 定时报警电路 15

4 系统软件设计