Max30100 sensor values become 0 while coded it to push readings into a database

[ashanmadhu1996]

I tried to save reading data to firebase and 000webhost database. So I could not to save exact readings to database.

#include <HTTPClient.h>
#include <WiFi.h>
#include "MAX30100_PulseOximeter.h"
#include "DHT.h"
#define DHTTYPE DHT11 
#define DHTPIN 18
#define ADC_VREF_mV    3300.0 // in millivolt
#define ADC_RESOLUTION 4096.0
#define PIN_LM35       36 // ESP32 pin GIOP36 (ADC0) connected to LM35
#define POX_REPORTING_PERIOD_MS  1000

DHT dht(DHTPIN, DHTTYPE);

// Update HOST URL here

#define HOST "https://braveheartsz.000webhostapp.com"          // Enter HOST URL without "http:// "  and "/" at the end of URL

#define WIFI_SSID "HUAWEI-F50B"            // WIFI SSID here                                   
#define WIFI_PASSWORD "00493700"        // WIFI password here


PulseOximeter pox;
uint32_t poxLastReport = 0;


// Declare global variables which will be uploaded to server

float temperature, humidity, BPM, SpO2, bodytemperature;

String sendval, sendval2, sendval3, sendval4, postData;

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

void setup() {    
  Serial.begin(115200); 
  Serial.println("Communication Started \n\n"); 
  Serial.println("DHT11 Output!");
  dht.begin(); 
  
  WiFi.mode(WIFI_STA);           
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);                                     //try to connect with wifi
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);
  while (WiFi.status() != WL_CONNECTED) 
  { Serial.print(".");
    delay(2000);
  }

  Serial.println();
  Serial.print("Connected to ");
  Serial.println(WIFI_SSID);
  Serial.print("IP Address is : ");
  Serial.println(WiFi.localIP());    //print local IP address
  Serial.print("Initializing pulse oximeter..");
  
  if (!pox.begin()) {
    Serial.println("FAILED");
    for (;;);
  }
  else 
  {
    Serial.println("SUCCESS");
    pox.setOnBeatDetectedCallback(onBeatDetected);
   
  }
  pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);
}

void loop() { 
   
  HTTPClient http;    // http object of clas HTTPClient
  WiFiClient wclient; // wclient object of clas HTTPClient    
  pox.update();

  float temp = dht.readTemperature();
  float hum = dht.readHumidity();  

  // read the ADC value from the temperature sensor
  int adcVal = analogRead(PIN_LM35);
  // convert the ADC value to voltage in millivolt
  float milliVolt = adcVal * (ADC_VREF_mV / ADC_RESOLUTION);
  // convert the voltage to the temperature in °C
  float tempC = milliVolt / 10;

  BPM = pox.getHeartRate();
  SpO2 = pox.getSpO2();

  if (millis() - poxLastReport > POX_REPORTING_PERIOD_MS)
  {
    BPM= round(pox.getHeartRate());
    SpO2= round(pox.getSpO2());
    Serial.print("BPM: ");
    Serial.println(BPM);

    Serial.print("SpO2: ");
    Serial.print(SpO2);
    Serial.println("%");
    
    if(isnan(temp) || isnan(hum)){
      Serial.println("Failed to read DHT11");
    }
    else{
      Serial.print("Humidity: ");
      Serial.print(hum);
      Serial.print(" %\t");
      Serial.print("Temperature: ");
      Serial.print(temp);
      Serial.println(" *C");
    }
    
    Serial.print("Temperature: ");
    Serial.print(tempC);   // print the temperature in °C
    Serial.println("°C");


    Serial.println("*********************************");
    Serial.println();
 
    poxLastReport = millis();
  }
  delay(1000);
  
  // Convert integer variables to string
  sendval = String(temp);  
  sendval2 = String(hum);
  sendval3 = String(pox.getSpO2());
  sendval4 = String(pox.getHeartRate());

 
  postData = "sendval=" + sendval + "&sendval2=" + sendval2 + "&sendval3=" + sendval3 + "&sendval4=" + sendval4 ;

  // We can post values to PHP files as  example.com/dbwrite.php?name1=val1&name2=val2&name3=val3
  // Hence created variable postDAta and stored our variables in it in desired format
  // For more detials, refer:- https://www.tutorialspoint.com/php/php_get_post.htm
  
  // Update Host URL here:-  
    
http.begin("https://braveheartsz.000webhostapp.com/weather/insert.php");              // Connect to host where MySQL databse is hosted
http.addHeader("Content-Type", "application/x-www-form-urlencoded");            //Specify content-type header
  
    
   
  int httpCode = http.POST(postData);   // Send POST request to php file and store server response code in variable named httpCode
  Serial.println("Values are, sendval = " + sendval + " and sendval2 = "+sendval2 + " and sendval3 = "+sendval3 + "and sendval4 = "+sendval4 );
  delay(1000);
  
  
  // if connection eatablished then do this
  if (httpCode == 200) { Serial.println("Values uploaded successfully."); Serial.println(httpCode); 
    String webpage = http.getString();    // Get html webpage output and store it in a string
    Serial.println(webpage + "\n"); 
  }

  // if failed to connect then return and restart
 else { 
    Serial.println(httpCode);
    Serial.println("Failed to upload values. \n"); 
    http.end(); 
    return;
  }

//  temp+=1; hum=10; // Incrementing value of variables
delay(1000);
}

[sterretje]

Please give a proper description of your problem. Can't you connect or can't you store ir ...?

Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project.