276 [Complete course design] Heart rate detection Bluetooth upload design based on 51 single chip microcomputer-heart rate-Bluetooth

[Resource Download] The download address is as follows:
https://docs.qq.com/doc/DTlRSd01BZXNpRUxl

51 heart rate detection Bluetooth upload design-heart rate-Bluetooth-LCD1602

This design consists of STC89C52 single-chip circuit + LCD1602 liquid crystal display circuit + pulse/heart rate sensor circuit + LM393 comparator module circuit + Bluetooth module circuit + power supply circuit.

1. Detect pulse/heart rate through pulse/heart rate sensor.

2. Real-time display of pulse/heart rate on the LCD.

3. Upload the pulse/heart rate to the mobile APP through the Bluetooth module.

4. If the heart rate exceeds 150, the device sends an alarm message to the APP.

unsigned char i_i=0,timecount=0,displayOK=0,rate=0,aa=0;//定义变量
unsigned int time[6]={0};
unsigned char tab_sk[16]="WO DE BI SHE    ";	//第一行显示
unsigned char tab_ht[16]="XL:000/min   ";  //第二行显示心率和温度

unsigned long time_50ms=0;	//定时器变量
unsigned char sys_times=0;

void time_init(void);	//函数定义
void init_int0(void);
void SendStr(unsigned char *s,unsigned char length);
void SendByte(unsigned char dat);
void UART_Init(void);

void main()
{	
	UART_Init();
	time_init();                    //初始化定时器 
	init_int0();	  //外部中断0初始化程序