一、Arduino與旭日X3派通信

1.查看X3派上python是否安裝serial包

2.X3派與Arduino之間通過USB進行通信

3.在終端上輸入 ls /dev/tty* 出現ACM0說明兩者可以正常通信

4.在Arduino上燒錄代碼

void setup() { Serial.begin(9600);}void loop(){ if ( Serial.available()) { if('s' == Serial.read()) Serial.println("HelloWorld!"); }}

5.在X3派上測試是否能夠收到信息

在終端下通過python3進行測試

最后print可以出現HelloWorld！

import serialser=serial.Serial('/dev/ttyACM0',9600,timeout=1)while 1: ser.write('s'.encode()) msg=ser.readall() print(msg)

ser.write('s')會報編碼的錯誤，使用方法encode()解決。

6.權限不夠，退出后終端輸入sudo su進入管理員模式可以解決

二、MAX30102人體心率血氧檢測模塊在上位機旭日X3派上的數據顯示

1.MAX30102

MAX30102是一種用于可穿戴健康設備的高靈敏度脈搏血氧儀和心率傳感器。

MAX30102內部集成了一整套完整信號采集電路，包括光信號發射及接收、AD轉換、環境光干擾消除及數字濾波部分，只將數字接口留給用戶。

2.Arduino代碼

#include #include "MAX30105.h"#include "spo2_algorithm.h"MAX30105 particleSensor;#define MAX_BRIGHTNESS 255#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)//Arduino Uno doesn't have enough SRAM to store 100 samples of IR led data and red led data in 32-bit format//To solve this problem, 16-bit MSB of the sampled data will be truncated. Samples become 16-bit data.uint16_t irBuffer[100]; //infrared LED sensor datauint16_t redBuffer[100]; //red LED sensor data#elseuint32_t irBuffer[100]; //infrared LED sensor datauint32_t redBuffer[100]; //red LED sensor data#endifint32_t bufferLength; //data lengthint32_t spo2; //SPO2 valueint8_t validSPO2; //indicator to show if the SPO2 calculation is validint32_t heartRate; //heart rate valueint8_t validHeartRate; //indicator to show if the heart rate calculation is validbyte pulseLED = 11; //Must be on PWM pinbyte readLED = 13; //Blinks with each data readvoid setup(){ Serial.begin(115200); // initialize serial communication at 115200 bits per second: pinMode(pulseLED, OUTPUT); pinMode(readLED, OUTPUT); // Initialize sensor if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed { Serial.println(F("MAX30105 was not found. Please check wiring/power.")); while (1); } //Serial.println(F("Attach sensor to finger with rubber band. Press any key to start conversion")); //while (Serial.available() == 0) ; //wait until user presses a key //Serial.read(); byte ledBrightness = 60; //Options: 0=Off to 255=50mA byte sampleAverage = 4; //Options: 1, 2, 4, 8, 16, 32 byte ledMode = 2; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green byte sampleRate = 100; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200 int pulseWidth = 411; //Options: 69, 118, 215, 411 int adcRange = 4096; //Options: 2048, 4096, 8192, 16384 particleSensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange); //Configure sensor with these settings}void loop(){ bufferLength = 100; //buffer length of 100 stores 4 seconds of samples running at 25sps //read the first 100 samples, and determine the signal range for (byte i = 0 ; i < bufferLength ; i++) { while (particleSensor.available() == false) //do we have new data? particleSensor.check(); //Check the sensor for new data redBuffer[i] = particleSensor.getRed(); irBuffer[i] = particleSensor.getIR(); particleSensor.nextSample(); //We're finished with this sample so move to next sample Serial.print(F("red=")); Serial.print(redBuffer[i], DEC); Serial.print(F(", ir=")); Serial.println(irBuffer[i], DEC); } //calculate heart rate and SpO2 after first 100 samples (first 4 seconds of samples) maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate); //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second while (1) { //dumping the first 25 sets of samples in the memory and shift the last 75 sets of samples to the top for (byte i = 25; i < 100; i++) { redBuffer[i - 25] = redBuffer[i]; irBuffer[i - 25] = irBuffer[i]; } //take 25 sets of samples before calculating the heart rate. for (byte i = 75; i < 100; i++) { while (particleSensor.available() == false) //do we have new data? particleSensor.check(); //Check the sensor for new data digitalWrite(readLED, !digitalRead(readLED)); //Blink onboard LED with every data read redBuffer[i] = particleSensor.getRed(); irBuffer[i] = particleSensor.getIR(); particleSensor.nextSample(); //We're finished with this sample so move to next sample //send samples and calculation result to terminal program through UART //Serial.print(F("red=")); //Serial.print(redBuffer[i], DEC); //Serial.print(F(", ir=")); //Serial.print(irBuffer[i], DEC); Serial.print(F(", HR=")); Serial.print(heartRate, DEC); //Serial.print(F(", HRvalid=")); //Serial.print(validHeartRate, DEC); Serial.print(F(", SPO2=")); Serial.println(spo2, DEC); //Serial.print(F(", SPO2Valid=")); //Serial.println(validSPO2, DEC); } //After gathering 25 new samples recalculate HR and SP02 maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate); }}

3.接線

VCC----5V

GND---GND

SCL----A5

SDA---A4

將MAX30102周圍用絕緣黑膠布包裹起來，避免手碰到電阻對結果產生影響

4.X3派代碼

sudo nano max30102_test.py

import serialser=serial.Serial('/dev/ttyACM0',115200,timeout=1)while 1: msg=ser.read(10) print(msg)

5.運行代碼

python3 max30102_test.py

將手放上測量心率血氧，心率可以較快得出，血氧需要等待較久。

HR為心率，SPO2為血氧，ir和red為計算的中間值。

本文轉自地平線開發者社區

原作者：jmulin

原鏈接：https://developer.horizon.ai/forumDetail/98129540173361549