Smart Gloves

/* ===================================================================
Thanks to Adafrut mqtt example.
Author: nishan chettri
This sketch includes the use of NTC 10D-9 thermistor, it is commented out.If you want to monitoe temperature too you can add the temperature sensor and uncomment.
=======================================================================
*/

#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <math.h>        //include math.h

/******************Thermistor Calibration*************************/
//float thermistorError=20 ;
//There is 6 degree deviation from actual value

/******************* WiFi Access Point ***************************/
#define WLAN_SSID       "nissan"
#define WLAN_PASS       "password"
/******************* Adafruit.io Setup ***************************/
#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883                   // use 8883 for SSL
#define AIO_USERNAME    "put your adafruit IO username herer"
#define AIO_KEY         "put your Api key here"
//********* Global State (you don't need to change this!) **********
// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;
// or... use WiFiFlientSecure for SSL
//WiFiClientSecure client;
// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
/************************ Feeds ********************************/
/************************* Topics ******************************/
//  Setup a feed called 'temp_topic' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Publish gsr = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/gsr10_05_2020");
//Adafruit_MQTT_Publish temp = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/temp");
//Publishing to the feed "band" in my dashboard
void MQTT_connect();
//declaration of mqtt connect funciton
//measure(beta,normal tempreature in K, normal resistance, analog value , Series resistance)
double measure(double beta,double To,double R,double aVal,double Rs);

void setup() {
  Serial.begin(115200);
  delay(10);
  Serial.println(F("Adafruit MQTT demo"));
// Connect to WiFi access point.
  Serial.println(); Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WLAN_SSID);
  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
Serial.println("WiFi connected");
  Serial.println("IP address: "); Serial.println(WiFi.localIP());
}
//uint32_t x = 0;
/************************ Loop  *****************************/
void loop()
{
  delay(2000);
  MQTT_connect();
//    double val=analogRead(34);   //analog read 
    double gsrValue=analogRead(A0);
  /*measure(beta,normal tempreature in K, normal resistance, analog value , Series resistance)*/
//    double temperature = measure(3000,25,10,val,120);
/************************ Publish  **************************/

  // Publishing the temperature and GSR raw data
//  if (! temp.publish(temperature)) {
//    Serial.println(F("temp Failed"));
//  } else {
//    Serial.println(F("OK!"));
//  }
    if (! gsr.publish(gsrValue)) {
    Serial.println(F("gsr Failed"));
  } else {
    Serial.println(gsrValue);
    Serial.println(F("OK!"));
  }
/************************ Ping  *********************************/
  // ping the server to keep the mqtt connection alive
  // NOT required if you are publishing once every KEEPALIVE seconds
  
    if(! mqtt.ping()) {
    mqtt.disconnect();
    }
  delay(2000);
}

/************************** MQTT Conn  **************************/
// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect()
{
  int8_t ret;
// Stop if already connected.
  if (mqtt.connected()) {
    return;
  }
Serial.print("Connecting to MQTT... ");
uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
    Serial.println(mqtt.connectErrorString(ret));
    Serial.println("Retrying MQTT connection in 5 seconds...");
    mqtt.disconnect();
    delay(5000);  // wait 5 seconds
    retries--;
    if (retries == 0) {
      // basically die and wait for WDT to reset me
      while (1);
    }
  }
  Serial.println("MQTT Connected!");
}
/*
 * Function to calculate temperature according to thermistor used here NTC 10D-9 is used
 * This function can be used with any thermistor
 */
 
//double measure(double beta,double To,double R,double aVal,double Rs)
//{ //steinhart hart eqution for temperature calculation
//  double To_C=To+273.15;
//  double Eout=(aVal/4095)*3.3;
//  double Rt=((3.3*Rs)/Eout)-120 ;
//  double alpha=log(Rt/R)/beta ;
//  double inv_To= 1/To_C ;
//  double Tk= 1/(alpha+inv_To) ; 
//  double Tc=Tk-273.15-thermistorError ; //convert from kelvin to celsius 
//  return Tc;
//}