Hi everyone,
I want to measure my heart rate with the MAX 30105 and an Arduino ESP-32 Dev Kit C. I used the example code (Example5_HeartRate) from the library and the Serial Monitor shows the exact measured values.
Here is my used code:
#include <WiFi.h>
#include <HTTPClient.h>
#include "MAX30105.h"
#include "heartRate.h"
MAX30105 particleSensor;
//Things to change
const char * ssid = "xy";
const char * password = "123456";
String GOOGLE_SCRIPT_ID = "AKfycbz2Vl3HJvYJ5SY8oIdmB4EJOuW-EXlOhQfly8G62KdYL4tAkiph"; // Replace by your GAS service id
const int sendInterval = 996 *5; // in millis, 996 instead of 1000 is adjustment, with 1000 it jumps ahead a minute every 3-4 hours
const byte RATE_SIZE = 4; //Increase this for more averaging. 4 is good.
byte rates[RATE_SIZE]; //Array of heart rates
byte rateSpot = 0;
long lastBeat = 0; //Time at which the last beat occurred
float beatsPerMinute;
int beatAvg;
//-------------
//updated 04.12.2019
const char * root_ca=\
"-----BEGIN CERTIFICATE-----\n" \
"MIIDujCCAqKgAwIBAgILBAAAAAABD4Ym5g0wDQYJKoZIhvcNAQEFBQAwTDEgMB4G\n" \
"A1UECxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjIxEzARBgNVBAoTCkdsb2JhbFNp\n" \
"Z24xEzARBgNVBAMTCkdsb2JhbFNpZ24wHhcNMDYxMjE1MDgwMDAwWhcNMjExMjE1\n" \
"MDgwMDAwWjBMMSAwHgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMjETMBEG\n" \
"A1UEChMKR2xvYmFsU2lnbjETMBEGA1UEAxMKR2xvYmFsU2lnbjCCASIwDQYJKoZI\n" \
"hvcNAQEBBQADggEPADCCAQoCggEBAKbPJA6+Lm8omUVCxKs+IVSbC9N/hHD6ErPL\n" \
"v4dfxn+G07IwXNb9rfF73OX4YJYJkhD10FPe+3t+c4isUoh7SqbKSaZeqKeMWhG8\n" \
"eoLrvozps6yWJQeXSpkqBy+0Hne/ig+1AnwblrjFuTosvNYSuetZfeLQBoZfXklq\n" \
"tTleiDTsvHgMCJiEbKjNS7SgfQx5TfC4LcshytVsW33hoCmEofnTlEnLJGKRILzd\n" \
"C9XZzPnqJworc5HGnRusyMvo4KD0L5CLTfuwNhv2GXqF4G3yYROIXJ/gkwpRl4pa\n" \
"zq+r1feqCapgvdzZX99yqWATXgAByUr6P6TqBwMhAo6CygPCm48CAwEAAaOBnDCB\n" \
"mTAOBgNVHQ8BAf8EBAMCAQYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUm+IH\n" \
"V2ccHsBqBt5ZtJot39wZhi4wNgYDVR0fBC8wLTAroCmgJ4YlaHR0cDovL2NybC5n\n" \
"bG9iYWxzaWduLm5ldC9yb290LXIyLmNybDAfBgNVHSMEGDAWgBSb4gdXZxwewGoG\n" \
"3lm0mi3f3BmGLjANBgkqhkiG9w0BAQUFAAOCAQEAmYFThxxol4aR7OBKuEQLq4Gs\n" \
"J0/WwbgcQ3izDJr86iw8bmEbTUsp9Z8FHSbBuOmDAGJFtqkIk7mpM0sYmsL4h4hO\n" \
"291xNBrBVNpGP+DTKqttVCL1OmLNIG+6KYnX3ZHu01yiPqFbQfXf5WRDLenVOavS\n" \
"ot+3i9DAgBkcRcAtjOj4LaR0VknFBbVPFd5uRHg5h6h+u/N5GJG79G+dwfCMNYxd\n" \
"AfvDbbnvRG15RjF+Cv6pgsH/76tuIMRQyV+dTZsXjAzlAcmgQWpzU/qlULRuJQ/7\n" \
"TBj0/VLZjmmx6BEP3ojY+x1J96relc8geMJgEtslQIxq/H5COEBkEveegeGTLg==\n" \
"-----END CERTIFICATE-----\n";
WiFiClientSecure client;
void setup() {
Serial.begin(115200);
delay(10);
//
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
//
//Serial.println("Started");
//Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
// delay(500);
// Serial.print(".");
//
//
//Serial.println("Ready to go");
}
// Serial.println("Initializing...");
// Initialize sensor
if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
{
Serial.println("MAX30105 was not found. Please check wiring/power. ");
while (1);
}
Serial.println("Place your index finger on the sensor with steady pressure.");
particleSensor.setup(); //Configure sensor with default settings
particleSensor.setPulseAmplitudeRed(0x0A); //Turn Red LED to low to indicate sensor is running
particleSensor.setPulseAmplitudeGreen(0); //Turn off Green LED
}
void loop()
{
long irValue = particleSensor.getIR();
if (checkForBeat(irValue) == true)
{
//We sensed a beat!
long delta = millis() - lastBeat;
lastBeat = millis();
beatsPerMinute = 60 / (delta / 1000.0);
if (beatsPerMinute < 255 && beatsPerMinute > 20)
{
rates[rateSpot++] = (byte)beatsPerMinute; //Store this reading in the array
rateSpot %= RATE_SIZE; //Wrap variable
//Take average of readings
beatAvg = 0;
for (byte x = 0 ; x < RATE_SIZE ; x++)
beatAvg += rates[x];
beatAvg /= RATE_SIZE;
}
}
Serial.print("IR="); Serial.print(irValue);
Serial.print(", BPM="); Serial.print(beatsPerMinute);
Serial.print(", Avg BPM="); Serial.print(beatAvg);
if (irValue < 50000)
Serial.print(" No finger?");
Serial.println();
The result is documented in the attached picture 1.
Now i want to transfer these data automatically into a google doc table sheet.
So i used the following lines and added them at the end of the upper code:
sendData("IR="+String(irValue)+"&BPM="+String(beatsPerMinute)+"&Avg="+String(beatAvg));
delay(sendInterval);
}
void sendData(String params) {
HTTPClient http;
String url="https://script.google.com/macros/s/"+GOOGLE_SCRIPT_ID+"/exec?"+params;
Serial.print(url);
Serial.print("Making a request");
http.begin(url, root_ca); //Specify the URL and certificate
int httpCode = http.GET();
http.end();
Serial.println(": done "+httpCode);
}
However the transfer of the ‘IR’ (infrared) value works fine, the transfer of the ‘BPM’ (beats per minute) values and ‘Avg’ (average beats per minute) values does not as you can see in the attached picture 2 (get everytime 0).
Does anyone know how i can fix it or what i should change?
Please keep in mind that i am quite new to this topic and dont have a lot of experiences 
If you need further information please contact me.
Thank you
P.S.: Unfortunately I am not able to upload the photos. Maybe an Admin could give me the permission and I am able to share them with you.