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/******************************************************** | ||
* | ||
* Project: MAXREFDES117# | ||
* Filename: RD117_ARDUINO.ino | ||
* Description: This module contains the Main application for the MAXREFDES117 example program. | ||
* | ||
* Revision History: | ||
*\n 1-18-2016 Rev 01.00 GL Initial release. | ||
*\n 12-22-2017 Rev 02.00 Significantlly modified by Robert Fraczkiewicz | ||
* | ||
* -------------------------------------------------------------------- | ||
* | ||
* This code follows the following naming conventions: | ||
* | ||
* char ch_pmod_value | ||
* char (array) s_pmod_s_string[16] | ||
* float f_pmod_value | ||
* int32_t n_pmod_value | ||
* int32_t (array) an_pmod_value[16] | ||
* int16_t w_pmod_value | ||
* int16_t (array) aw_pmod_value[16] | ||
* uint16_t uw_pmod_value | ||
* uint16_t (array) auw_pmod_value[16] | ||
* uint8_t uch_pmod_value | ||
* uint8_t (array) auch_pmod_buffer[16] | ||
* uint32_t un_pmod_value | ||
* int32_t * pn_pmod_value | ||
* | ||
* ------------------------------------------------------------------------- */ | ||
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#include <Arduino.h> | ||
#include <Wire.h> | ||
#include <SPI.h> | ||
#include <SD.h> | ||
#include "algorithm_by_RF.h" | ||
#include "max30102.h" | ||
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//#define DEBUG // Uncomment for debug output to the Serial stream | ||
#define TEST_MAXIM_ALGORITHM // Uncomment if you want to include results returned by the original MAXIM algorithm | ||
//#define SAVE_RAW_DATA // Uncomment if you want raw data coming out of the sensor saved to SD card. Red signal first, IR second. | ||
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#ifdef TEST_MAXIM_ALGORITHM | ||
#include "algorithm.h" | ||
#endif | ||
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File dataFile; | ||
// ADALOGGER pins | ||
const byte chipSelect = 4; | ||
const byte cardDetect = 7; | ||
const byte batteryPin = 9; | ||
const byte ledPin = 13; // Red LED on ADALOGGER | ||
const byte sdIndicatorPin = 8; // Green LED on ADALOGGER | ||
const byte oxiInt = 10; // ADALOGGER pin connected to MAX30102 INT | ||
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bool cardOK; | ||
uint32_t elapsedTime,timeStart; | ||
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uint32_t aun_ir_buffer[BUFFER_SIZE]; //infrared LED sensor data | ||
uint32_t aun_red_buffer[BUFFER_SIZE]; //red LED sensor data | ||
float old_n_spo2; // Previous SPO2 value | ||
uint8_t uch_dummy,k; | ||
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void setup() { | ||
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pinMode(cardDetect,INPUT_PULLUP); | ||
pinMode(batteryPin,INPUT); | ||
pinMode(oxiInt, INPUT); //pin D10 connects to the interrupt output pin of the MAX30102 | ||
pinMode(ledPin,OUTPUT); | ||
digitalWrite(ledPin,LOW); | ||
pinMode(sdIndicatorPin,OUTPUT); | ||
digitalWrite(sdIndicatorPin,LOW); | ||
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Wire.begin(); | ||
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#ifdef DEBUG | ||
// initialize serial communication at 115200 bits per second: | ||
Serial.begin(115200); | ||
#endif | ||
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maxim_max30102_reset(); //resets the MAX30102 | ||
delay(1000); | ||
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maxim_max30102_read_reg(REG_INTR_STATUS_1,&uch_dummy); //Reads/clears the interrupt status register | ||
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// Measure battery voltage | ||
float measuredvbat = analogRead(batteryPin); | ||
measuredvbat *= 2; // we divided by 2, so multiply back | ||
measuredvbat *= 3.3; // Multiply by 3.3V, our reference voltage | ||
measuredvbat /= 1024; // convert to voltage | ||
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char my_status[20]; | ||
if(HIGH==digitalRead(cardDetect)) { | ||
// we'll use the initialization code from the utility libraries | ||
// since we're just testing if the card is working! | ||
if(!SD.begin(chipSelect)) { | ||
cardOK=false; | ||
strncpy(my_status,"CardInit!",9); | ||
} else cardOK=true; | ||
} else { | ||
cardOK=false; | ||
strncpy(my_status,"NoSDCard!",9); | ||
} | ||
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if(cardOK) { | ||
long count=0; | ||
char fname[20]; | ||
do { | ||
// if(useClock && now.month()<13 && now.day()<32) { | ||
// sprintf(fname,"%d-%d_%d.txt",now.month(),now.day(),++count); | ||
// } else { | ||
sprintf(fname,"data_%d.txt",++count); | ||
// } | ||
} while(SD.exists(fname)); | ||
dataFile = SD.open(fname, FILE_WRITE); | ||
strncpy(my_status,fname,19); | ||
} | ||
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#ifdef DEBUG | ||
while(Serial.available()==0) //wait until user presses a key | ||
{ | ||
Serial.print(F("Vbatt=\t")); | ||
Serial.println(measuredvbat); | ||
Serial.println(my_status); | ||
Serial.println(dataFile,HEX); | ||
Serial.println(F("Press any key to start conversion")); | ||
delay(1000); | ||
} | ||
uch_dummy=Serial.read(); | ||
#endif | ||
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blinkLED(ledPin,cardOK); | ||
old_n_spo2=0.0; | ||
maxim_max30102_init(); //initialize the MAX30102 | ||
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k=0; | ||
dataFile.println(F("Vbatt=\t")); | ||
dataFile.println(measuredvbat); | ||
dataFile.println(my_status); | ||
#ifdef TEST_MAXIM_ALGORITHM | ||
dataFile.print(F("Time\tSpO2\tHR\tSpO2_MX\tHR_MX\tClock\tRatio\tCorr")); | ||
#else | ||
dataFile.print(F("Time\tSpO2\tHR\tClock\tRatio\tCorr")); | ||
#endif | ||
#ifdef SAVE_RAW_DATA | ||
int8_t i; | ||
// These are headers for the red signal | ||
for(i=0;i<BUFFER_SIZE;++i) { | ||
dataFile.print("\t"); | ||
dataFile.print(i); | ||
} | ||
// These are headers for the infrared signal | ||
for(i=0;i<BUFFER_SIZE;++i) { | ||
dataFile.print("\t"); | ||
dataFile.print(i); | ||
} | ||
#endif | ||
dataFile.println(""); | ||
timeStart=millis(); | ||
} | ||
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//Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 4 seconds | ||
void loop() { | ||
float n_spo2,ratio,correl; //SPO2 value | ||
int8_t ch_spo2_valid; //indicator to show if the SPO2 calculation is valid | ||
int32_t n_heart_rate; //heart rate value | ||
int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid | ||
int8_t i; | ||
char hr_str[10]; | ||
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//buffer length of 100 stores 4 seconds of samples running at 25sps | ||
//read 100 samples, and determine the signal range | ||
for(i=0;i<BUFFER_SIZE;i++) | ||
{ | ||
while(digitalRead(oxiInt)==1); //wait until the interrupt pin asserts | ||
maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); //read from MAX30102 FIFO | ||
#ifdef DEBUG | ||
Serial.print(i, DEC); | ||
Serial.print(F("\t")); | ||
Serial.print(aun_red_buffer[i], DEC); | ||
Serial.print(F("\t")); | ||
Serial.print(aun_ir_buffer[i], DEC); | ||
Serial.println(""); | ||
#endif | ||
} | ||
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//calculate heart rate and SpO2 after 100 samples (4 seconds of samples) using Robert's method | ||
rf_heart_rate_and_oxygen_saturation(aun_ir_buffer, BUFFER_SIZE, aun_red_buffer, &n_spo2, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid, &ratio, &correl); | ||
elapsedTime=millis()-timeStart; | ||
millis_to_hours(elapsedTime,hr_str); | ||
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#ifdef DEBUG | ||
Serial.println("--RF--"); | ||
Serial.print(elapsedTime); | ||
Serial.print("\t"); | ||
Serial.print(n_spo2); | ||
Serial.print("\t"); | ||
Serial.print(n_heart_rate, DEC); | ||
Serial.print("\t"); | ||
Serial.println(hr_str); | ||
Serial.println("------"); | ||
#endif | ||
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#ifdef TEST_MAXIM_ALGORITHM | ||
//calculate heart rate and SpO2 after 100 samples (4 seconds of samples) using MAXIM's method | ||
float n_spo2_maxim; //SPO2 value | ||
int8_t ch_spo2_valid_maxim; //indicator to show if the SPO2 calculation is valid | ||
int32_t n_heart_rate_maxim; //heart rate value | ||
int8_t ch_hr_valid_maxim; //indicator to show if the heart rate calculation is valid | ||
maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, BUFFER_SIZE, aun_red_buffer, &n_spo2_maxim, &ch_spo2_valid_maxim, &n_heart_rate_maxim, &ch_hr_valid_maxim); | ||
#ifdef DEBUG | ||
Serial.println("--MX--"); | ||
Serial.print(elapsedTime); | ||
Serial.print("\t"); | ||
Serial.print(n_spo2_maxim); | ||
Serial.print("\t"); | ||
Serial.print(n_heart_rate_maxim, DEC); | ||
Serial.print("\t"); | ||
Serial.println(hr_str); | ||
Serial.println("------"); | ||
#endif | ||
#endif | ||
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//save samples and calculation result to SD card | ||
#ifdef TEST_MAXIM_ALGORITHM | ||
if(ch_hr_valid && ch_spo2_valid || ch_hr_valid_maxim && ch_spo2_valid_maxim) { | ||
#else | ||
if(ch_hr_valid && ch_spo2_valid) { | ||
#endif | ||
++k; | ||
dataFile.print(elapsedTime); | ||
dataFile.print("\t"); | ||
dataFile.print(n_spo2); | ||
dataFile.print("\t"); | ||
dataFile.print(n_heart_rate, DEC); | ||
dataFile.print("\t"); | ||
#ifdef TEST_MAXIM_ALGORITHM | ||
dataFile.print(n_spo2_maxim); | ||
dataFile.print("\t"); | ||
dataFile.print(n_heart_rate_maxim, DEC); | ||
dataFile.print("\t"); | ||
#endif | ||
dataFile.print(hr_str); | ||
dataFile.print("\t"); | ||
dataFile.print(ratio); | ||
dataFile.print("\t"); | ||
dataFile.print(correl); | ||
#ifdef SAVE_RAW_DATA | ||
// Save raw data for unusual O2 levels | ||
for(i=0;i<BUFFER_SIZE;++i) | ||
{ | ||
dataFile.print(F("\t")); | ||
dataFile.print(aun_red_buffer[i], DEC); | ||
} | ||
for(i=0;i<BUFFER_SIZE;++i) | ||
{ | ||
dataFile.print(F("\t")); | ||
dataFile.print(aun_ir_buffer[i], DEC); | ||
} | ||
#endif | ||
dataFile.println(""); | ||
old_n_spo2=n_spo2; | ||
// Blink green LED to indicate save event | ||
digitalWrite(sdIndicatorPin,HIGH); | ||
delay(10); | ||
digitalWrite(sdIndicatorPin,LOW); | ||
// FLush SD buffer every 10 points | ||
if(k>=10) { | ||
dataFile.flush(); | ||
k=0; | ||
} | ||
} | ||
} | ||
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void millis_to_hours(uint32_t ms, char* hr_str) | ||
{ | ||
char istr[6]; | ||
uint32_t secs,mins,hrs; | ||
secs=ms/1000; // time in seconds | ||
mins=secs/60; // time in minutes | ||
secs-=60*mins; // leftover seconds | ||
hrs=mins/60; // time in hours | ||
mins-=60*hrs; // leftover minutes | ||
itoa(hrs,hr_str,10); | ||
strcat(hr_str,":"); | ||
itoa(mins,istr,10); | ||
strcat(hr_str,istr); | ||
strcat(hr_str,":"); | ||
itoa(secs,istr,10); | ||
strcat(hr_str,istr); | ||
} | ||
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// blink three times if isOK is true, otherwise blink continuously | ||
void blinkLED(const byte led, bool isOK) | ||
{ | ||
byte i; | ||
if(isOK) { | ||
for(i=0;i<3;++i) { | ||
digitalWrite(led,HIGH); | ||
delay(200); | ||
digitalWrite(led,LOW); | ||
delay(200); | ||
} | ||
} else { | ||
while(1) { | ||
for(i=0;i<2;++i) { | ||
digitalWrite(led,HIGH); | ||
delay(50); | ||
digitalWrite(led,LOW); | ||
delay(50); | ||
} | ||
delay(500); | ||
} | ||
} | ||
} | ||
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