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- #include <Wire.h>
- #include "MAX30105.h"
- #include "spo2_algorithm.h"
- MAX30105 particleSensor;
- #define MAX_BRIGHTNESS 255
- uint32_t irBuffer[100];
- uint32_t redBuffer[100];
- int32_t bufferLength;
- int32_t spo2;
- int8_t validSPO2;
- int32_t heartRate;
- int8_t validHeartRate;
- void setup() {
- Serial.begin(115200);
- initO2Sensor();
- }
- void loop() {
- readO2Sensor();
- }
- void initO2Sensor() {
- if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) {
- 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 readO2Sensor() {
- bufferLength = 100;
- 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
- 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.print(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);
- }
- }
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