Interfacing Blynk with ESP32

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MOHAMMAD SAIFIQUL AIMAN B MOHAMMAD ALI

192011145

R2427-MICROELECTRONIC ENGINEERING

Blynk is a new platform that allows you to quickly and easily design interfaces for managing and monitoring your hardware projects from your iOS or Android device. After downloading the Blynk software and placing buttons, sliders, graphs, and other widgets on the screen, you may construct a project dashboard.


Objectives :

1.    configure and interface Blynk with ESP32

2.    How to code and link the Blynk with Arduino IDE








TASK 1

 Source code : 

/*************************************************************


  This example shows how value can be pushed from Arduino to

  the Blynk App.


  NOTE:

  BlynkTimer provides SimpleTimer functionality:

    http://playground.arduino.cc/Code/SimpleTimer


  App project setup:

    Value Display widget attached to Virtual Pin V5

 *************************************************************/


// Template ID, Device Name and Auth Token are provided by the Blynk.Cloud

// See the Device Info tab, or Template settings

//#define BLYNK_TEMPLATE_ID           "TMPLxxxxxx"

//#define BLYNK_DEVICE_NAME           "Device"

//#define BLYNK_AUTH_TOKEN            "YourAuthToken"



// Comment this out to disable prints and save space

#define BLYNK_PRINT Serial


#include <WiFi.h>

#include <WiFiClient.h>

#include <BlynkSimpleEsp32.h>


//Output Pin

#define LED_R 16

#define LED_Y 17

#define LED_G 5


//Input Pin

#define PB_Pin 4

#define VR_Pin 35

#define LDR_Pin 34

#define MCP_Pin 39

#define LM35_Pin 39


#define VIN 3.3 // V power voltage, 3.3v in case of NodeMCU

#define R 10000 // Voltage devider resistor value


// Your WiFi credentials.

// Set password to "" for open networks.

char ssid[] = "SAIFIQUL";

char pass[] = "BLYNKINTERFACE";

char auth[] = "S0WTXVKtAYf2_xodx1wMptOcIGuq_V40";


WidgetLED led1(V8);

BlynkTimer timer;


float get_VR(void)

{ float VR_Vout = (analogRead(VR_Pin)* VIN / float(4095));// Conversion analog to voltage

  float VR = ((R * VR_Vout) / VIN); // Conversion voltage to resistance in Ohm

  float VR_K = VR / 1000;

  return VR_K;

}


int get_lux(void)

{ float LDR_Vout = (analogRead(LDR_Pin)* VIN / float(4095));// Conversion analog to voltage

  float RLDR = (R * LDR_Vout)/(VIN - LDR_Vout); // Conversion voltage to resistance in Ohm

  int lux = 170/(RLDR/1000); // Conversion resitance to lumen, RLDR/1000 - convert Ohm to KOhm

  return lux;

}


float get_MCP9700(void)

{ float Temp_Vout = (analogRead(MCP_Pin) * VIN / float(4095)-0.5);// Conversion analog to voltage

  float temp = Temp_Vout / 0.01; // Conversion resitance to lumen, RLDR/1000 - convert Ohm to KOhm

  return temp;

}


float get_LM35(void)

{ float Temp_Vout = (analogRead(LM35_Pin) * VIN / float(4095));// Conversion analog to voltage

  float temp = Temp_Vout / 0.01; // Conversion resitance to lumen, RLDR/1000 - convert Ohm to KOhm

  return temp;

}


// This function sends Arduino's up time every second to Virtual Pin (5).

// In the app, Widget's reading frequency should be set to PUSH. This means

// that you define how often to send data to Blynk App.

void myTimerEvent()

{

  int PB_state = !digitalRead(PB_Pin);

  float VR_vlaue = get_VR();

  int lux_value = get_lux();

  float MCP_value = get_MCP9700();

  //float LM35_value = get_LM35();


  if(PB_state){led1.on();} else{led1.off();}

  //Blynk.virtualWrite(V8, PB_state);

  Blynk.virtualWrite(V4, VR_vlaue);

  Blynk.virtualWrite(V5, lux_value);

  Blynk.virtualWrite(V6, MCP_value);

  //Blynk.virtualWrite(V7, LM35_value);

  

  Serial.println("PB state: "+String(PB_state));

  Serial.println(String(VR_vlaue)+" KOhm");

  Serial.println(String(lux_value)+" LUX");

  Serial.println(String(MCP_value)+" 'C");

  //Serial.println(String(LM35_value)+" 'C");


  Serial.println();

}


// This function will be called every time Slider Widget

// in Blynk app writes values to the Virtual Pin 1

BLYNK_WRITE(V0)

{

  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable

  digitalWrite(LED_R, pinValue);

  Serial.print("V0 LED_R value is: ");

  Serial.println(pinValue);

}


BLYNK_WRITE(V1)

{

  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable

  digitalWrite(LED_Y, pinValue);

  Serial.print("V1 LED_Y value is: ");

  Serial.println(pinValue);

}


BLYNK_WRITE(V2)

{

  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable

  digitalWrite(LED_G, pinValue);

  Serial.print("V2 LED_G value is: ");

  Serial.println(pinValue);

}



void setup()

{

  // Debug console

  Serial.begin(115200);

  

  pinMode(LED_R, OUTPUT);

  pinMode(LED_Y, OUTPUT);

  pinMode(LED_G, OUTPUT);

  //pinMode(PB_Pin, INPUT_PULLUP);

  

  Blynk.begin(auth, ssid, pass);

  // Setup a function to be called every second

  timer.setInterval(1000L, myTimerEvent);

}


void loop()

{

  Blynk.run();

  timer.run(); // Initiates BlynkTimer

}


Testing your project








TASK 2


Source code :

/*************************************************************

  This example shows how value can be pushed from Arduino to

  the Blynk App.

  NOTE:

  BlynkTimer provides SimpleTimer functionality:

    http://playground.arduino.cc/Code/SimpleTimer

  App project setup:

    Value Display widget attached to Virtual Pin V5

 *************************************************************/


// Template ID, Device Name and Auth Token are provided by the Blynk.Cloud

// See the Device Info tab, or Template settings

//#define BLYNK_TEMPLATE_ID           "TMPLxxxxxx"

//#define BLYNK_DEVICE_NAME           "Device"

//#define BLYNK_AUTH_TOKEN            "YourAuthToken"



// Comment this out to disable prints and save space

#define BLYNK_PRINT Serial


#include <WiFi.h>

#include <WiFiClient.h>

#include <BlynkSimpleEsp32.h>


//Output Pin

#define LED_R 16

#define LED_Y 17

#define LED_G 5


//Input Pin

#define LDR_Pin 34


#define VIN 3.3 // V power voltage, 3.3v in case of NodeMCU

#define R 10000 // Voltage devider resistor value


// Your WiFi credentials.

// Set password to "" for open networks.

char ssid[] = "SAIFIQUL";

char pass[] = "BLYNKINTERFACE";

char auth[] = "S0WTXVKtAYf2_xodx1wMptOcIGuq_V40";


WidgetLED led0(V0);

WidgetLED led1(V1);

WidgetLED led2(V2);

BlynkTimer timer;


int get_lux(void)

{ float LDR_Vout = (analogRead(LDR_Pin)* VIN / float(4095));// Conversion analog to voltage

  float RLDR = (R * LDR_Vout)/(VIN - LDR_Vout); // Conversion voltage to resistance in Ohm

  int lux = 170/(RLDR/1000); // Conversion resitance to lumen, RLDR/1000 - convert Ohm to KOhm

  return lux;

}



// This function sends Arduino's up time every second to Virtual Pin (5).

// In the app, Widget's reading frequency should be set to PUSH. This means

// that you define how often to send data to Blynk App.

void myTimerEvent()

{

  int lux_value = get_lux();

  //float LM35_value = get_LM35();

  

  Blynk.virtualWrite(V5, lux_value);

  

  if( lux_value > 150 ){

    digitalWrite(LED_G, HIGH);

    digitalWrite(LED_Y, LOW);

    digitalWrite(LED_R, LOW);

    led2.on();

    led0.off();

    led1.off();

    } 

  else if(( lux_value > 20 )&&( lux_value < 150)){

    digitalWrite(LED_G, LOW);

    digitalWrite(LED_Y, HIGH);

    digitalWrite(LED_R, LOW);

    led1.on();

    led0.off();

    led2.off();

    }

 else {

    digitalWrite(LED_G, LOW);

    digitalWrite(LED_Y, LOW);

    digitalWrite(LED_R, HIGH);

    led0.on();

    led1.off();

    led2.off();

    }

   

  //Blynk.virtualWrite(V8, PB_state);

  

  Serial.println(String(lux_value)+" LUX");


  Serial.println();

}


// This function will be called every time Slider Widget

// in Blynk app writes values to the Virtual Pin 3

BLYNK_WRITE(V3)

{

  int pinValue = param.asInt(); // assigning incoming value from pin V3 to a variable

  digitalWrite(LED_BUILTIN, pinValue);

  Serial.print("LED on ESP32 value is: ");

  Serial.println(pinValue);

}



void setup()

{

  // Debug console

  Serial.begin(115200);

  

  pinMode(LED_R, OUTPUT);

  pinMode(LED_Y, OUTPUT);

  pinMode(LED_G, OUTPUT);

  pinMode(LED_BUILTIN, OUTPUT);

  //pinMode(PB_Pin, INPUT_PULLUP);

  

  Blynk.begin(auth, ssid, pass);

  // Setup a function to be called every second

  timer.setInterval(1000L, myTimerEvent);

}


void loop()

{

  Blynk.run();

  timer.run(); // Initiates BlynkTimer

}






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