Final Comit

index.ino

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+#include <Adafruit_GFX.h>
+#include <Adafruit_PCD8544.h>
+#include "DHT.h"
+
+
+// pin 8 - Serial clock out (SCLK)
+// pin 9 - Serial data out (DIN)
+// pin 10 - Data/Command select (D/C)
+// pin 11 - LCD chip select (CS)
+// pin 12 - LCD reset (RST)
+
+
+#define RST 12
+#define CE 11
+#define DC 10
+#define DIN 9
+#define CLK 8
+
+
+#define voltagePin A3
+#define currentPin A4
+#define tempPin 2
+
+#define DHTTYPE DHT11
+
+#define loadRelay 3
+#define fanRelay 4
+
+const float voltageThreshold = 17;
+const double currentThreshold = 2;
+const float tempThreshold = 50;
+
+const int toleranceTime = 1000;
+//Creating the instances
+
+DHT dht(tempPin, DHTTYPE);
+Adafruit_PCD8544 display = Adafruit_PCD8544(CLK,DIN,DC,CE,RST);
+
+
+
+float getVoltage(){
+  return analogRead(voltagePin)*5.0/1024*5.7/1.414;
+}
+
+const int sensorIn = A4;
+int mVperAmp = 66; // use 100 for 20A Module and 66 for 30A Module
+
+double currVolt = 0;
+double VRMS = 0;
+double AmpsRMS = 0;
+
+float getCurr(){
+
+ currVolt = getVPP();
+ VRMS = (currVolt/2.0) *0.707;  //root 2 is 0.707
+ AmpsRMS = (VRMS * 1000)/mVperAmp;
+ return AmpsRMS;
+}
+
+float getVPP()
+{
+  float result;
+  int readValue;             //value read from the sensor
+  int maxValue = 0;          // store max value here
+  int minValue = 1024;          // store min value here
+
+   uint32_t start_time = millis();
+   while((millis()-start_time) < 1000) //sample for 1 Sec
+   {
+       readValue = analogRead(sensorIn);
+       // see if you have a new maxValue
+       if (readValue > maxValue) 
+       {
+           /*record the maximum sensor value*/
+           maxValue = readValue;
+       }
+       if (readValue < minValue) 
+       {
+           /*record the minimum sensor value*/
+           minValue = readValue;
+       }
+   }
+
+   // Subtract min from max
+   result = ((maxValue - minValue) * 5.0)/1024.0;
+
+   return result;
+}
+
+float readTemp(){
+  float t = dht.readTemperature();
+  return t;
+
+}
+
+void setup(){
+  Serial.begin(9600);
+  pinMode(loadRelay,OUTPUT);
+  pinMode(fanRelay,OUTPUT);
+  digitalWrite(loadRelay,HIGH);
+  digitalWrite(fanRelay,HIGH);
+  display.begin();
+
+  display.setContrast(50);
+
+
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setTextColor(BLACK);
+  display.setCursor(10,15);
+  display.println("Transformer");
+  display.println("  Protection");
+  display.display();
+  delay(1000);
+  display.clearDisplay();
+
+}
+
+float Voltage;
+float Current;
+float Temp;
+
+bool stateOfLoad = HIGH;
+bool stateOfFan = HIGH;
+
+void loop(){
+  Voltage = getVoltage();
+  Current = getCurr();
+  Temp = readTemp();
+  display.clearDisplay();
+  display.print("V:");
+  display.println(Voltage);
+  display.print("I:");
+
+  display.println(Current);  
+  display.print("T:");
+  display.println(Temp);
+  Serial.print(Voltage);
+  Serial.print("\t");
+  Serial.println(Current);
+
+
+
+  if(Voltage>voltageThreshold){
+    if(stateOfLoad == HIGH){
+      stateOfLoad = LOW;
+      delay(500);
+      digitalWrite(loadRelay,LOW);
+    }
+    display.println("\nOvervoltage !");
+    delay(500);
+  }
+  if(Current>currentThreshold){
+    if(stateOfLoad == HIGH){
+      stateOfLoad = LOW;
+      delay(500);
+      digitalWrite(loadRelay,LOW);
+    }
+    display.println("\nOvercurrent !");
+    delay(500);
+  }
+  if(Temp>tempThreshold){
+    if(stateOfFan == HIGH){
+      stateOfFan = LOW;
+      delay(500);
+      digitalWrite(fanRelay,LOW);
+    }
+    display.println("\nOvertemperature !");
+    delay(500);
+  }
+  if((Voltage<=voltageThreshold)&&(Current<=currentThreshold)&&(Temp<=tempThreshold)){
+    display.println("\nStatus:OK");
+  }
+  display.display();
+  if(Temp<=tempThreshold){
+    digitalWrite(fanRelay,HIGH);
+  }
+  delay(20);
+
+
+}