心率计电路
心率计电路主要由电源部分、产生负电压的电路、心率采集、单片机、三位数码管显示。
电源部分,由12V的电压—VD1防反接—高频低频滤波—-LM7805输出5V电压;
心率采集电路,当手指放在TCRT5000的发射管处—-TP5、TP6两个都是输入的信号,通过C10进行耦合
单片机电路分析,单片机的6、7脚接的12M的晶振,但是如果单片机内部自带晶振就可以不需要外部的12M晶振了,3脚RST接的是复位引脚,当S1没有闭合的情况下,RST是低电平就不复位,当S1闭合的情况下R19,与R20进行分压RST为高电平此时复位单片机,P3.3接口计数脉冲的个数,由P1.0到P1.6来控制数码管的段选,由P3.7、P2.6、P2.7来控制数码管的位选,LED4是三位共阳的数码管。
RC振荡产生一个矩形波,周期为T=2.2R3C5,通过这个非门对高低电平进行翻转。
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