基于STM32设计的人体健康检测仪

业界资讯 2023-07-30 04:16:37 阅读次数: 0

一、项目介绍

当前文章介绍基于STM32设计的人体健康检测仪。设备采用STM32系列MCU作为主控芯片，配备血氧浓度传感器（使用MAX30102血氧浓度检测传感器）、OLED屏幕和电池供电等外设模块。设备可以广泛应用于医疗、健康等领域。可以帮助医生和病人更好地了解病情变化，提高治疗效果和生活质量。设备也可以用于健康管理、运动监测等场景，帮助用户了解自己的身体状况，保持健康的生活方式。

在项目中，使用了KEIL作为开发平台和工具，通过血氧模块采集人体的心跳和血氧浓度参数，并通过OLED屏幕显示现在的心跳和血氧浓度。同时，通过指标分析，提供采集到的数据与正常指标比对，分析被检测人员的健康状态。采集的数据可通过蓝牙或者WIFI传递给手机APP进行处理，方便用户随时了解自己的身体状况。

本设计采用STM32为主控芯片，搭配血氧浓度传感器和OLED屏幕，实现了人体健康数据的采集和展示，并对采集到的数据进行分析，判断被检测人员的健康状态。同时，设计使用蓝牙或WiFi将采集到的数据传递给手机APP进行处理。

image-20230618132149185

image-20230618132108207

二、项目设计思路

2.1 硬件设计

（1）主控芯片：STM32系列MCU，负责驱动其他外设模块；

（2）血氧浓度传感器：使用MAX30102血氧浓度检测传感器，用于采集人体的心跳和血氧浓度参数；

（3）OLED屏：用于显示现在的心跳和血氧浓度；

2.2 软件设计

(1) 通过血氧模块采集人体的心跳和血氧浓度参数；

(2) 通过OLED屏显示现在的心跳和血氧浓度；

(3) 对采集到的数据进行指标分析，将采集到的数据与正常指标比对，分析被检测人员的健康状态；

(4) 采集的数据可通过蓝牙或WiFi传递给手机APP进行处理。

2.3 技术实现

（1）设计采用AD8232心电图（ECG）模块和MAX30102血氧模块采集心跳和血氧浓度参数，并通过I2C接口连接主控芯片STM32。

（2）OLED屏使用I2C接口与主控芯片STM32连接。

（3）采集到的数据通过算法进行指标分析，将采集到的数据与正常指标比对，判断被检测人员的健康状态。

（4）设备通过蓝牙或WiFi将采集到的数据传递给手机APP进行处理。

三、代码设计

3.1 MAX30102血氧模块代码

I2C协议代码：

#define MAX30102_I2C_ADDR 0xAE

void MAX30102_I2C_Init(void)
{
    
    
    GPIO_InitTypeDef  GPIO_InitStructure;
    I2C_InitTypeDef   I2C_InitStructure;

    /* Enable GPIOB clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    /* Enable I2C1 and I2C2 clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 | RCC_APB1Periph_I2C2, ENABLE);

    // Configure I2C SCL and SDA pins
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; // Open-drain output
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    // Configure I2C parameters
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000; // 100KHz
    I2C_Init(I2C1, &I2C_InitStructure);

    // Enable I2C
    I2C_Cmd(I2C1, ENABLE);
}

void MAX30102_I2C_WriteReg(uint8_t reg, uint8_t value)
{
    
    
    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C1, ENABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, MAX30102_I2C_ADDR, I2C_Direction_Transmitter);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    I2C_SendData(I2C1, reg);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_SendData(I2C1, value);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_GenerateSTOP(I2C1, ENABLE);
}

uint8_t MAX30102_I2C_ReadReg(uint8_t reg)
{
    
    
    uint8_t value;

    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C1, ENABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, MAX30102_I2C_ADDR, I2C_Direction_Transmitter);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    I2C_SendData(I2C1, reg);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_GenerateSTART(I2C1, ENABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, MAX30102_I2C_ADDR, I2C_Direction_Receiver);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    I2C_AcknowledgeConfig(I2C1, DISABLE);
    value = I2C_ReceiveData(I2C1);

    I2C_GenerateSTOP(I2C1, ENABLE);

    return value;
}

void MAX30102_I2C_ReadArray(uint8_t reg, uint8_t* data, uint8_t len)
{
    
    
    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C1, ENABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, MAX30102_I2C_ADDR, I2C_Direction_Transmitter);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    I2C_SendData(I2C1, reg);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_GenerateSTART(I2C1, ENABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, MAX30102_I2C_ADDR, I2C_Direction_Receiver);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    while(len > 1)
    {
    
    
        I2C_AcknowledgeConfig(I2C1, ENABLE);
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
        *data++ = I2C_ReceiveData(I2C1);
        len--;
    }

    I2C_AcknowledgeConfig(I2C1, DISABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    *data++ = I2C_ReceiveData(I2C1);

    I2C_GenerateSTOP(I2C1, ENABLE);
}

MAX30102的初始化函数和数据获取函数：

void MAX30102_Init(void)
{
    
    
    MAX30102_I2C_Init();

    // Reset the device
    MAX30102_I2C_WriteReg(0x09, 0x40);
    HAL_Delay(100);
    MAX30102_I2C_WriteReg(0x09, 0x00);

    // Set FIFO average to 4 samples
    MAX30102_I2C_WriteReg(0x08, 0x03);

    // Set LED pulse amplitude
    MAX30102_I2C_WriteReg(0x0C, 0x1F);
    MAX30102_I2C_WriteReg(0x0D, 0x1F);

    // Set sample rate to 100Hz
    MAX30102_I2C_WriteReg(0x0F, 0x04);

    // Enable the red LED only
    MAX30102_I2C_WriteReg(0x11, 0x02);

    // Read the temperature value to start a reading
    MAX30102_I2C_ReadReg(0x1F);
}

uint32_t MAX30102_GetHeartRate(void)
{
    
    
    uint8_t buffer[MAX30102_FIFO_DEPTH*4];
    MAX30102_Data sensor_data = {
    
    0};
    uint16_t ir_value;
    uint16_t red_value;
    uint8_t byte_count, fifo_overflow;

    // Check if any data is available in FIFO
    byte_count = MAX30102_I2C_ReadReg(0x06) - MAX30102_I2C_ReadReg(0x04);
    if(byte_count > 0)
    {
    
    
        fifo_overflow = MAX30102_I2C_ReadReg(0x09) & 0x80;

        // Read the data from FIFO
        MAX30102_I2C_ReadArray(0x07, buffer, byte_count);

        // Parse the data
        for(int i=0; i<byte_count; i+=4)
        {
    
    
            ir_value = ((uint16_t)buffer[i] << 8) | buffer[i+1];
            red_value = ((uint16_t)buffer[i+2] << 8) | buffer[i+3];

            // Update the sensor data
            MAX30102_UpdateData(&sensor_data, ir_value, red_value);
        }

        if(!fifo_overflow && MAX30102_CheckForBeat(sensor_data.IR_AC_Signal_Current))
        {
    
    
            return MAX30102_HeartRate(sensor_data.IR_AC_Signal_Previous, 16);
        }
    }

    return 0;
}

数据处理函数：

void MAX30102_UpdateData(MAX30102_Data* data, uint16_t ir_value, uint16_t red_value)
{
    
    
    int32_t ir_val_diff = ir_value - data->IR_AC_Signal_Current;
    int32_t red_val_diff = red_value - data->Red_AC_Signal_Current;

    // Update IR AC and DC signals
    data->IR_AC_Signal_Current = (ir_val_diff + (7 * data->IR_AC_Signal_Previous)) / 8;
    data->IR_DC_Signal_Current = (ir_value + data->IR_AC_Signal_Current + (2 * data->IR_DC_Signal_Current)) / 4;
    data->IR_AC_Signal_Previous = data->IR_AC_Signal_Current;

    // Update Red AC and DC signals
    data->Red_AC_Signal_Current = (red_val_diff + (7 * data->Red_AC_Signal_Previous)) / 8;
    data->Red_DC_Signal_Current = (red_value + data->Red_AC_Signal_Current + (2 * data->Red_DC_Signal_Current)) / 4;
    data->Red_AC_Signal_Previous = data->Red_AC_Signal_Current;

    // Update IR and Red AC signal peak-to-peak values
    if(data->IR_AC_Signal_Current > data->IR_AC_Max)
        data->IR_AC_Max = data->IR_AC_Signal_Current;
    else if(data->IR_AC_Signal_Current < data->IR_AC_Min)
        data->IR_AC_Min = data->IR_AC_Signal_Current;

    if(data->Red_AC_Signal_Current > data->Red_AC_Max)
        data->Red_AC_Max = data->Red_AC_Signal_Current;
    else if(data->Red_AC_Signal_Current < data->Red_AC_Min)
        data->Red_AC_Min = data->Red_AC_Signal_Current;
}

uint8_t MAX30102_CheckForBeat(int32_t ir_val)
{
    
    
    static uint8_t beat_detection_enabled = 1;
    static uint32_t last_beat_time = 0;
    static int32_t threshold = 0x7FFFFF;

    uint32_t delta_time;
    int32_t beat_amplitude;

    if(beat_detection_enabled)
    {
    
    
        // Increment the beat counter
        MAX30102_beat_counter++;

        // Calculate the threshold value
        threshold += (ir_val - threshold) / 8;

        // Check if a beat has occurred
        if(ir_val > threshold && MAX30102_beat_counter > 20)
        {
    
    
            delta_time = micros() - last_beat_time;
            last_beat_time = micros();
            beat_amplitude = ir_val - threshold;
            if(delta_time < 1000 || delta_time > 2000 || beat_amplitude < 20 ||
            beat_amplitude > 1000) {
    
     return 0; }
                   // Reset the beat counter and set the threshold value
        MAX30102_beat_counter = 0;
        threshold = ir_val;

        return 1;
    }
}

return 0;
}

uint32_t MAX30102_HeartRate(int32_t ir_val, uint8_t samples) {
    
     int32_t ir_val_sum = 0;
// Calculate the sum of IR values
for(int i=0; i<samples; i++)
{
    
    
    ir_val_sum += MAX30102_IR_Sample_Buffer[i];
}

// Calculate the average IR value
ir_val_sum /= samples;

// Calculate the heart rate
return (uint32_t)(60 * MAX30102_SAMPLING_FREQUENCY / (ir_val - ir_val_sum));
}

3.2 OLED显示屏驱动代码

I2C协议代码：

#define SSD1306_I2C_ADDR 0x78

void SSD1306_I2C_Init(void)
{
    
    
    GPIO_InitTypeDef  GPIO_InitStructure;
    I2C_InitTypeDef   I2C_InitStructure;

    /* Enable GPIOB clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    /* Enable I2C1 and I2C2 clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 | RCC_APB1Periph_I2C2, ENABLE);

    // Configure I2C SCL and SDA pins
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; // Open-drain output
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    // Configure I2C parameters
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000; // 100KHz
    I2C_Init(I2C1, &I2C_InitStructure);

    // Enable I2C
    I2C_Cmd(I2C1, ENABLE);
}

void SSD1306_I2C_WriteReg(uint8_t reg, uint8_t value)
{
    
    
    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C1, ENABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, SSD1306_I2C_ADDR, I2C_Direction_Transmitter);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    I2C_SendData(I2C1, 0x00);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_SendData(I2C1, reg);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_SendData(I2C1, value);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_GenerateSTOP(I2C1, ENABLE);
}

void SSD1306_I2C_WriteArray(uint8_t* data, uint16_t len)
{
    
    
    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C1, ENABLE);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, SSD1306_I2C_ADDR, I2C_Direction_Transmitter);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    while(len--)
    {
    
    
        I2C_SendData(I2C1, *data++);
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
    }

    I2C_GenerateSTOP(I2C1, ENABLE);
}

SSD1306的初始化函数和数据更新函数：

#define SSD1306_WIDTH 128
#define SSD1306_HEIGHT 64
#define SSD1306_BUFFER_SIZE (SSD1306_WIDTH*SSD1306_HEIGHT/8)

uint8_t SSD1306_Buffer[SSD1306_BUFFER_SIZE];

void SSD1306_Init(void)
{
    
    
    SSD1306_I2C_Init();

    // Turn display off
    SSD1306_DisplayOff();

    // Set the clock to a high value for faster data transfer
    SSD1306_I2C_WriteReg(0x0F, 0x80);

    // Set multiplex ratio to default value (63)
    SSD1306_I2C_WriteReg(0xA8, 0x3F);

    // Set the display offset to 0
    SSD1306_I2C_WriteReg(0xD3, 0x00);

    // Display start line is 0
    SSD1306_I2C_WriteReg(0x40, 0x00);

    // Set segment remap to inverted
    SSD1306_I2C_WriteReg(0xA1, 0xC0);

    // Set COM output scan direction to inverted
    SSD1306_I2C_WriteReg(0xC8, 0xC0);

    // Disable display offset shift
    SSD1306_I2C_WriteReg(0xD7, 0x9F);

    // Set display clock divide ratio/oscillator frequency to default value (8/0xF0)
    SSD1306_I2C_WriteReg(0xD5, 0xF0);

    // Enable charge pump regulator
    SSD1306_I2C_WriteReg(0x8D, 0x14);

    // Set memory addressing mode
    // Set the display to normal mode (not inverted)
SSD1306_I2C_WriteReg(0xA6, 0xA6);

// Set the contrast to a default value of 127
SSD1306_I2C_WriteReg(0x81, 0x7F);

// Turn the display back on
SSD1306_DisplayOn();

// Clear the display buffer
SSD1306_ClearBuffer();

// Update the display with the cleared buffer
SSD1306_UpdateDisplay();
}

void SSD1306_UpdateDisplay(void) {
    
     uint8_t column, page;
}for(page=0; page<8; page++)
{
    
    
    SSD1306_I2C_WriteReg(0xB0+page, 0x00);
    SSD1306_I2C_WriteReg(0x10, 0x00);
    SSD1306_I2C_WriteReg(0x00, 0x00);

    for(column=0; column<SSD1306_WIDTH; column++)
    {
    
    
        SSD1306_I2C_WriteArray(&SSD1306_Buffer[column + page*SSD1306_WIDTH], 1);
    }
}
}
void SSD1306_ClearBuffer(void) {
    
     memset(SSD1306_Buffer, 0x00, sizeof(SSD1306_Buffer)); }

void SSD1306_SetPixel(uint8_t x, uint8_t y, uint8_t color) {
    
     if(x >= SSD1306_WIDTH || y >= SSD1306_HEIGHT) {
    
     return; }
}if(color)
{
    
    
    SSD1306_Buffer[x + (y/8)*SSD1306_WIDTH] |= (1 << (y%8));
}
else
{
    
    
    SSD1306_Buffer[x + (y/8)*SSD1306_WIDTH] &= ~(1 << (y%8));
}
}

四、总结

本设计采用STM32为主控芯片，配合血氧浓度传感器和OLED屏幕，实现了人体健康数据的采集和展示，并通过算法对采集到的数据进行分析，判断被检测人员的健康状态。同时，设计使用蓝牙或WiFi将采集到的数据传递给手机APP进行处理。设计基本满足了人体健康检测仪的技术要求和环境要求。

猜你喜欢

转载自blog.csdn.net/xiaolong1126626497/article/details/131979504
今日推荐
《美国对全球网络空间安全与发展的威胁和破坏》报告发布
火速冲上 GitHub 热榜 —— 开源编程语言、框架哪有这么可爱？
北京人形机器人创新中心发布全球首个纯电驱拟人奔跑的全尺寸人形机器人“天工”
LFOSSA 源来如此公开课 | 掌握云原生未来：CNCF 认证全面攻略与备考秘籍
周排行
循环神经网络（rnn）讲解
Tigao教程四：单独的关节运动
金蝶K3WISE15.0-注册套打教程
如何在Mac上配置Kubernetes
Android应用结束自身进程的方法
SpringMVC学习 十三 拦截器栈
中国驻洛杉矶总领馆举行新春招待会
HttpClient get post 发送
11 - three.js 笔记 - 绘制三维字体模型
Mysql递归获取某个父节点下面的所有子节点和子节点上的所有父节点
每日归档
更多
2024-05-01(4)
2024-04-30(1)
2024-04-29(40)
2024-04-28(0)
2024-04-27(56)
2024-04-26(39)
2024-04-25(22)
2024-04-24(36)
2024-04-23(26)
2024-04-22(39)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022