FastBond智能可穿戴之心率加速度传感器
本设计实现了一个小型可穿戴设备,采用ESP32 pico作为主控,MAX30100作为心率血氧传感器,ADXL345作为加速度传感器,可作为可穿戴设备的基本传感器参考设计。
标签
嵌入式系统
wangyue
更新2021-11-19
1027

内容介绍

项目介绍

本设计实现了一个小型可穿戴设备,可以进行心率检测及加速度检测,并将传感器数据实时显示在0.96OLED上。硬件系统采用ESP32 pico作为主控,MAX30100作为心率血氧传感器,ADXL345作为加速度传感器,项目采用Arduino环境开发。

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项目硬件介绍

硬件   公司
ESP32-PICO 乐鑫
MAX30100 美信
ADXL345 亚诺德

ESP32-PICO

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ESP32-PICO-KIT 是乐鑫开发的最小开发板,可插接于迷你面包板。其核心是具有完整 Wi-Fi 和蓝牙功能的 ESP32 系列 SiP 模组 ESP32-PICO-D4。与其他模组相比,它已经集成了晶振、flash、滤波电容和射频匹配网络等功能,降低了开发难度及硬件复杂度。

MAX30100

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MAX30100是一款集成脉搏血氧饱和度和心率监测传感器解决方案。它结合了两个LED,一个光电探测器、优化光学元件和低噪声模拟电路检测脉搏血氧饱和度和心率的信号处理信号。可通过软件断电,待机电流可忽略不计,使电源始终保持连接。

ADXL345

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ADXL345 是一款低功耗、3 轴 MEMS 加速度计模块,具有 I2C 和 SPI 接口。该传感器由硅晶片上的微机械结构组成,由多晶硅弹簧悬挂,当受到 X、Y 或 Z 轴加速时,它可以在任何方向平滑偏转。偏转会导致固定板和连接到悬挂结构的板之间的电容发生变化。每个轴上电容的这种变化被转换为与该轴上的加速度成正比的输出电压。同时,此传感器的灵敏度也是可调的,用户可以将灵敏度级别设置为 +-2g、+-4g、+-8g 或 +-16g。较低的范围为慢动作提供更高的分辨率,较高的范围有利于高速跟踪。

功能演示:

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代码:

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_ADXL345_U.h>

/* Assign a unique ID to this sensor at the same time */
Adafruit_ADXL345_Unified accel = Adafruit_ADXL345_Unified(12345);

#include "MAX30100_PulseOximeter.h"
 
#define REPORTING_PERIOD_MS     1000
 
PulseOximeter pox;
uint32_t tsLastReport = 0;

#include <Arduino.h>
#include <U8g2lib.h>

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

char buffer[10];

void onBeatDetected()
{
    Serial.println("Beat!");
}

void displaySensorDetails(void)
{
  sensor_t sensor;
  accel.getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" m/s^2");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" m/s^2");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" m/s^2");  
  Serial.println("------------------------------------");
  Serial.println("");
  delay(500);
}

void displayDataRate(void)
{
  Serial.print  ("Data Rate:    "); 
  
  switch(accel.getDataRate())
  {
    case ADXL345_DATARATE_3200_HZ:
      Serial.print  ("3200 "); 
      break;
    case ADXL345_DATARATE_1600_HZ:
      Serial.print  ("1600 "); 
      break;
    case ADXL345_DATARATE_800_HZ:
      Serial.print  ("800 "); 
      break;
    case ADXL345_DATARATE_400_HZ:
      Serial.print  ("400 "); 
      break;
    case ADXL345_DATARATE_200_HZ:
      Serial.print  ("200 "); 
      break;
    case ADXL345_DATARATE_100_HZ:
      Serial.print  ("100 "); 
      break;
    case ADXL345_DATARATE_50_HZ:
      Serial.print  ("50 "); 
      break;
    case ADXL345_DATARATE_25_HZ:
      Serial.print  ("25 "); 
      break;
    case ADXL345_DATARATE_12_5_HZ:
      Serial.print  ("12.5 "); 
      break;
    case ADXL345_DATARATE_6_25HZ:
      Serial.print  ("6.25 "); 
      break;
    case ADXL345_DATARATE_3_13_HZ:
      Serial.print  ("3.13 "); 
      break;
    case ADXL345_DATARATE_1_56_HZ:
      Serial.print  ("1.56 "); 
      break;
    case ADXL345_DATARATE_0_78_HZ:
      Serial.print  ("0.78 "); 
      break;
    case ADXL345_DATARATE_0_39_HZ:
      Serial.print  ("0.39 "); 
      break;
    case ADXL345_DATARATE_0_20_HZ:
      Serial.print  ("0.20 "); 
      break;
    case ADXL345_DATARATE_0_10_HZ:
      Serial.print  ("0.10 "); 
      break;
    default:
      Serial.print  ("???? "); 
      break;
  }  
  Serial.println(" Hz");  
}

void displayRange(void)
{
  Serial.print  ("Range:         +/- "); 
  
  switch(accel.getRange())
  {
    case ADXL345_RANGE_16_G:
      Serial.print  ("16 "); 
      break;
    case ADXL345_RANGE_8_G:
      Serial.print  ("8 "); 
      break;
    case ADXL345_RANGE_4_G:
      Serial.print  ("4 "); 
      break;
    case ADXL345_RANGE_2_G:
      Serial.print  ("2 "); 
      break;
    default:
      Serial.print  ("?? "); 
      break;
  }  
  Serial.println(" g");  
}

void setup(void) 
{
#ifndef ESP8266
  while (!Serial); // for Leonardo/Micro/Zero
#endif
  Serial.begin(9600);
  u8g2.begin();
  Serial.println("Accelerometer Test"); Serial.println("");
  
  /* Initialise the sensor */
  if(!accel.begin())
  {
    /* There was a problem detecting the ADXL345 ... check your connections */
    Serial.println("Ooops, no ADXL345 detected ... Check your wiring!");
    while(1);
  }

  /* Set the range to whatever is appropriate for your project */
  accel.setRange(ADXL345_RANGE_16_G);
  // accel.setRange(ADXL345_RANGE_8_G);
  // accel.setRange(ADXL345_RANGE_4_G);
  // accel.setRange(ADXL345_RANGE_2_G);
  
  /* Display some basic information on this sensor */
  displaySensorDetails();
  
  /* Display additional settings (outside the scope of sensor_t) */
  displayDataRate();
  displayRange();
  Serial.println("");
  Serial.print("Initializing pulse oximeter..");
 
  // Initialize the PulseOximeter instance
  // Failures are generally due to an improper I2C wiring, missing power supply
  // or wrong target chip
  if (!pox.begin()) {
      Serial.println("FAILED");
      for(;;);
  } else {
      Serial.println("SUCCESS");
  }
  pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);
 
  // Register a callback for the beat detection
  pox.setOnBeatDetectedCallback(onBeatDetected);
     
}

int hr,spo2;
int i=0;
void loop(void) 
{
  /* Get a new sensor event */ 
  sensors_event_t event; 
  accel.getEvent(&event);
 
  /* Display the results (acceleration is measured in m/s^2) */
  Serial.print("X: "); Serial.print(event.acceleration.x); Serial.print("  ");
  Serial.print("Y: "); Serial.print(event.acceleration.y); Serial.print("  ");
  Serial.print("Z: "); Serial.print(event.acceleration.z); Serial.print("  ");Serial.println("m/s^2 ");
  
  pox.update();
  if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
      Serial.print("Heart rate:");
      hr=pox.getHeartRate();
      Serial.print(hr);
      Serial.print("bpm / SpO2:");
      spo2=pox.getSpO2();
      Serial.print(spo2);
      Serial.println("%");
 
      tsLastReport = millis();
  }

  i++;
  if (i>5)
  {
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
  
  u8g2.drawStr(0,10,"Heart Rate:");  // write something to the internal memory
  dtostrf(hr,3,0,buffer);
  u8g2.drawStr(90,10,buffer);  // write something to the internal memory

  u8g2.drawStr(0,20,"SpO2:");  // write something to the internal memory
  dtostrf(spo2,3,1,buffer);
  u8g2.drawStr(90,20,buffer);  // write something to the internal memory

  u8g2.drawStr(0,30,"X:");  // write something to the internal memory
  dtostrf(event.acceleration.x,3,2,buffer);
  u8g2.drawStr(90,30,buffer);  // write something to the internal memory

  u8g2.drawStr(0,40,"Y:");  // write something to the internal memory
  dtostrf(event.acceleration.y,3,2,buffer);
  u8g2.drawStr(90,40,buffer);  // write something to the internal memory

  u8g2.drawStr(0,50,"Z:");  // write something to the internal memory
  dtostrf(event.acceleration.z,3,2,buffer);
  u8g2.drawStr(90,50,buffer);  // write something to the internal memory
  
  u8g2.sendBuffer();          // transfer internal memory to the display
  i=0;
  }
}

附件下载

MAX30100_ADXL345.ino

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