Week 6(FYP2)

TITLE : Write Programming for Controller

OBJECTIVES :

• Make a coding for controller block which is NodeMCU

METHODOLOGY :

• The coding programming was using Arduino IDE software
• The coding need a combination of current sensor by ACS712 and displayed it on Blynk Application

RESULTS :

• The coding programming

#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

BlynkTimer timer;

char auth[]       = "Aut Token";

char ssid[]       = "WiFi name";

char pass[]       = "WiFi Password";

const int Sensor_Pin = A0;

int Sensitivity = 66;   // 185mV/A for 5A, 100 mV/A for 20A and 66mV/A for 30A Module

float Vpp = 0; // peak-peak voltage

float Vrms = 0; // rms voltage

float Irms = 0; // rms current   

float Vcc = 5.0;         // ADC reference voltage // voltage at 5V pin

float Supply_Voltage = 230.0;

float power = 0;         // power in watt             

float Wh =0 ;             // Energy in kWh

unsigned long last_time =0;

unsigned long current_time =0;

unsigned long interval = 100;

unsigned int calibration = 100;  // V2 slider calibrates this

int pF = 85;            // Power Factor default 85

void getACS712()

{  // for AC

  Vpp = getVPP();

  Vrms = (Vpp/2.0) *0.707;

  Vrms = Vrms - (calibration / 10000.0);     // calibtrate to zero with slider

  Irms = (Vrms * 1000)/Sensitivity ;

  if((Irms > -0.08) && (Irms < 0.05))

  {  // remove low end chatter

    Irms = 0.0;

  }

  power= (Supply_Voltage * Irms) * (pF / 100.0);

  Blynk.virtualWrite(V0, String(power,2));

  Blynk.virtualWrite(V1, String(Irms, 2));   

}

float getVPP()

{

  float result;

  int readValue;               

  int maxValue = 0;            

  int minValue = 1024;         

  uint32_t start_time = millis();

  while((millis()-start_time) < 950) //read every 0.95 Sec

  {

     readValue = analogRead(Sensor_Pin);   

     if (readValue > maxValue)

     {        

         maxValue = readValue;

     }

     if (readValue < minValue)

     {         

         minValue = readValue;

     }

  }

   result = ((maxValue - minValue) * Vcc) / 1024.0; 

   return result;

 }

 BLYNK_WRITE(V2) {  // calibration slider 50 to 200

    calibration = param.asInt();

    }

void setup()

{ 

  Serial.begin(115200);

  Blynk.begin(auth, ssid, pass);

  while (Blynk.connect() == false) {}

  timer.setInterval(2000L, getACS712); // get data every 2s

}

BLYNK_CONNECTED()

{

  Blynk.syncAll(); 

}

void loop()

{

  Blynk.run();

  timer.run();

}

ANALYSIS & DISCUSSION:

• The coding was making from different resource and make combination the different resource.

CONCLUSION:

• The coding programming is successfully done.