first commit

src/main.cpp

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+#include <Arduino.h>
+#include <SoftwareSerial.h>
+
+// Define pins for sensor 1
+#define TRIG_PIN_1 9
+#define ECHO_PIN_1 10
+
+// Define pins for sensor 2
+#define TRIG_PIN_2 11
+#define ECHO_PIN_2 12
+
+// Define pins for relay channels
+#define RELAY_PIN_1 4
+#define RELAY_PIN_2 5
+
+#define SensorPin1 A0 // pH meter Analog output to Arduino Analog Input 0
+#define SensorPin2 A1 // pH meter Analog output to Arduino Analog Input 1
+
+float calibration_value1 = 21.34 + 5.8; // Calibration value for Sensor 1
+float calibration_value2 = 21.34 + 7.5; // Calibration value for Sensor 1
+
+SoftwareSerial mySerial(2, 3); // RX, TX , Software serial from ESP-01 to Arduino
+
+int i = 0;
+
+float processPHsensor(int pin, float calibration_value)
+{
+  int buf[10];
+  int temp;
+  unsigned long int avgValue;
+
+  // Read and smooth the sensor data
+  for (int i = 0; i < 10; i++)
+  {
+    buf[i] = analogRead(pin);
+    delay(10);
+  }
+
+  // Sort the values
+  for (int i = 0; i < 9; i++)
+  {
+    for (int j = i + 1; j < 10; j++)
+    {
+      if (buf[i] > buf[j])
+      {
+        temp = buf[i];
+        buf[i] = buf[j];
+        buf[j] = temp;
+      }
+    }
+  }
+
+  // Calculate the average of the middle 6 values
+  avgValue = 0;
+  for (int i = 2; i < 8; i++)
+    avgValue += buf[i];
+
+  // Convert the average value to pH
+  float phValue = (float)avgValue * 5.0 / 1024 / 6;
+  phValue = -5.70 * phValue + calibration_value;
+
+  return phValue;
+}
+
+long measureDistance(int trigPin, int echoPin)
+{
+  // Clear the trigger
+  digitalWrite(trigPin, LOW);
+  delayMicroseconds(2);
+
+  // Send a 10 microsecond pulse to the trigger
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
+
+  // Read the pulse duration
+  return pulseIn(echoPin, HIGH);
+}
+
+void setup()
+{
+  Serial.begin(115200);
+  mySerial.begin(115200);
+
+  // initialize ph sensor
+  pinMode(SensorPin1, INPUT);
+  pinMode(SensorPin2, INPUT);
+
+  // Initialize sensor 1
+  pinMode(TRIG_PIN_1, OUTPUT);
+  pinMode(ECHO_PIN_1, INPUT);
+
+  // Initialize sensor 2
+  pinMode(TRIG_PIN_2, OUTPUT);
+  pinMode(ECHO_PIN_2, INPUT);
+
+  // Initialize relay pins
+  pinMode(RELAY_PIN_1, OUTPUT);
+  pinMode(RELAY_PIN_2, OUTPUT);
+
+  // Ensure relays are off at the start
+  digitalWrite(RELAY_PIN_1, LOW);
+  digitalWrite(RELAY_PIN_2, LOW);
+
+  // delay(1000);
+}
+
+void loop()
+{
+  // String IncomingStr = "";
+  // bool flag = false;
+
+  // // Check if data is available from ESP-01
+  // while (mySerial.available()) {
+  //   IncomingStr = mySerial.readString();
+  //   flag = true;
+  // }
+
+  // if (flag) {
+  //   String response = IncomingStr + ", Back from Arduino " + i + " times";
+  //   Serial.println(response); // Print to Serial monitor for debugging
+  //   mySerial.print("aran"); // Send response back to ESP-01
+  //   mySerial.print(i);
+  //   mySerial.print ("\n");
+  //   i++;
+  // }
+
+  // Measure distance for sensor 1
+  long duration1 = measureDistance(TRIG_PIN_1, ECHO_PIN_1);
+  float distance1 = (duration1 / 2.0) * 0.0344;
+
+  // Measure distance for sensor 2
+  long duration2 = measureDistance(TRIG_PIN_2, ECHO_PIN_2);
+  float distance2 = (duration2 / 2.0) * 0.0344;
+
+  float phValue1 = processPHsensor(SensorPin1, calibration_value1);
+  float phValue2 = processPHsensor(SensorPin2, calibration_value2);
+  // float phValue2 = processPHsensor(SensorPin2, calibration_value2);
+
+  // Print the pH values to the serial monitor
+
+  Serial.print("Distance1: ");
+  Serial.print(distance1);
+  Serial.print("cm ,Distance2: ");
+  Serial.print(distance2);
+  Serial.println("cm ");
+
+  Serial.print("pH Value 1: ");
+  Serial.println(phValue1);
+
+  Serial.print("pH Value 2: ");
+  Serial.println(phValue2);
+
+  if (distance1 <= 30)
+  {
+    digitalWrite(RELAY_PIN_1, HIGH);
+    digitalWrite(RELAY_PIN_2, LOW);
+  }
+  else if (distance1 >= 60)
+  {
+    digitalWrite(RELAY_PIN_2, HIGH);
+    digitalWrite(RELAY_PIN_1, LOW);
+  }
+  else
+  {
+    digitalWrite(RELAY_PIN_1, LOW);
+    digitalWrite(RELAY_PIN_2, LOW);
+  }
+
+  mySerial.print(distance1);
+  mySerial.print(",");
+  mySerial.print(distance2);
+  mySerial.print(",");
+  mySerial.print(phValue1);
+  mySerial.print(",");
+  mySerial.print(phValue2);
+  mySerial.print("\n");
+
+  delay(2000);
+}