基于单片机的智能SMS心率计设计

Design of an intelligent SMS cardiotachometer based on single chip microcontroller

设计实现了从单片机为控制核心的智能SMS心率计。通过被测人将手指放在红外传感器中间时,由于指尖的血液透明度随脉搏跳动会有明显变化,可根据光敏接收管收到的信号,对脉搏检测信号进行放大、滤波、整形,得到一个矩形波计数信号,此信号被STC89C52单片机识别用于被测人的脉搏计算。该设计合理地利用软件编程的方法,只需2 s即可在LCD1602液晶屏上显示心率值,还具备心率报警功能,可以自由设置限值,如果低于下限值或高于上限值,则该模块会发出响声和发短信给相关的监护人进行报警。实验表明,该研究对实际应用具有一定的参考价值。

The intelligent SMS cardiotachometer based on microcontroller was realized with this design.When a person puts his fingertips in the middle of infrared sensors,because the transparency of his blood has obvious changes with pulse beat,the pulse detection signal is amplified,filtered and shaped according to the signal received by the infrared sensors of phototransistor to obtain a square wave signal which can be recognized by the single chip microcomputer STC89C52to calculate the pulse of the person under test.With rational software programming method,the heart rate is displayed on LCD1602within2seconds.This intelligent SMS cardiotachometer can set the threshold of heart rate by buttons.If the heart rate is out of scope between the lowest and highest thresholds,it will make a sound alarm and send a SMS message to guardian’s mobile phone.This research has a certain value for actual application.