/* Program done on 13/02/2024 by AMALJITH A --
Using limit switches(LS), LED's (Blue, Red, Green), Potentiometer as Load, Push button(Start_button), and Relay's (BO, BC, HU, HD)
 1- All LED's and Relays are off 
 2- LS = 1 and Load >= 30Kg; Hold the previous condition 1
 3- if (Start_button = High to Low(pressed) && LS = 0 && Load > 10 Kg) then Blue- ON, HD- ON 
    else got to condition 1:
 4- if load <= 10Kg , BLUE led ON and HD OFF
 5- when push button pressed again go to step condition 3: */


// Assigning pin for potentiometer
int Load_pin = A0;

// Assign pins for limit switches (LS)
int LS_pin = 2;

// Assigning pins for Relays
int BO_relay = 4;
int BC_relay = 5;
int HU_relay = 6;
int HD_relay = 7;

// Assign pin for push button
int Start_button = 8;

// Assign pins for LEDs
int Blue_led = 10;
int Red_led = 11;
int Green_led = 12;

// assigning flags for push button and limit switch 
bool buttonPressed = false;
bool LS_state = false;
int Load = 0;
bool cond_3 = false; // Flag to keep track of condition 3 execution

// Function to set all LEDs and Relays to OFF state condition 1:
void Initial_setup() {
  digitalWrite(BO_relay, LOW);
  digitalWrite(BC_relay, LOW);
  digitalWrite(HU_relay, LOW);
  digitalWrite(HD_relay, LOW);
  digitalWrite(Blue_led, LOW);
  digitalWrite(Red_led, LOW);
  digitalWrite(Green_led, LOW);
}

void setup() {
  // Set pin modes
  pinMode(LS_pin, INPUT);
  pinMode(Start_button, INPUT);
  pinMode(BO_relay, OUTPUT);
  pinMode(BC_relay, OUTPUT);
  pinMode(HU_relay, OUTPUT);
  pinMode(HD_relay, OUTPUT);
  pinMode(Blue_led, OUTPUT);
  pinMode(Red_led, OUTPUT);
  pinMode(Green_led, OUTPUT);

  // Initialize all components to OFF state
  Initial_setup();

  // Begin serial communication
  Serial.begin(9600);
}

void loop() {
  // Call push button to check button state
  PB_Button();
  
  // to monitor the load cell
  Loadcell();
  
  // Check for condition 2:
  if (LS_state == HIGH && Load >= 30) {
    // Hold the previous condition (All LEDs and Relays OFF)
    Initial_setup();
  }
  
  // Check for condition 3:
  if (buttonPressed && LS_state == LOW && Load > 10) {
    digitalWrite(Blue_led, HIGH);
    digitalWrite(HD_relay, HIGH);
    cond_3 = true;
  }
  
  // Check for condition 4:
  if (cond_3 && Load <= 10) {
    digitalWrite(HD_relay, LOW);
    digitalWrite(Blue_led, HIGH);
  }
  // To reset the flag and achieve condition 3 when push button is pressed 
  if (digitalRead(Start_button) == LOW && !buttonPressed) {
    cond_3 = false;
  }
}


void Loadcell() {
  // Read the state of the limit switch
  LS_state = digitalRead(LS_pin);

  // Read the value from the potentiometer (load cell)
  int potValue = analogRead(Load_pin);
  // Map the potentiometer value from its current range to the desired range 0-200 assuming it as Load in Kg
  Load = map(potValue, 0, 1023, 0, 200); 
  Serial.println("Load: " + String(Load) + " Kg");
  delay(500);
}

// Function for the push button
void PB_Button() {
  // Check if the button is pressed 
  if (digitalRead(Start_button) == LOW && !buttonPressed) {
    // Set buttonPressed flag to true
    buttonPressed = true;

    // Update Load value
    Loadcell();
  } else if (digitalRead(Start_button) == HIGH && buttonPressed) {
    // Reset buttonPressed flag when button is released
    buttonPressed = false;
  }
}