#include <Stepper.h>
#include <Servo.h>
#include <LiquidCrystal_I2C.h>

// --- Technical Specifications from Assignment 2  ---
const float V_REF = 5.0;           // Reference Voltage 
const long RESOLUTION = 65535;     // 16-bit ADC Resolution (2^16 - 1) 
const int FS = 150;                // Sampling Rate 150Hz for Nyquist compliance [cite: 10, 36]
const float LYSIS_THRESHOLD = 1.0498; // Reconstituted Vcond from Binary Word [cite: 29]

// Hardware Setup
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo piezoStack;
const int buttonPin = 2;
const int stepPin = 9;
const int dirPin = 8;

unsigned long lastSampleTime = 0;
const unsigned long sampleInterval = 1000 / FS; // 6.66ms for 150Hz [cite: 110]

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  piezoStack.attach(6);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  
  lcd.print("iCELLS OPTIMIZED");
  delay(1000);
  lcd.clear();
}

void loop() {
  unsigned long currentTime = millis();

  // 1. TEMPORAL SAMPLING VALIDATION (Nyquist Compliance [cite: 33])
  if (currentTime - lastSampleTime >= sampleInterval) {
    lastSampleTime = currentTime;

    // 2. DATA ACQUISITION & RECONSTITUTION [cite: 20]
    int rawValue = analogRead(A0);
    // Simulating the 16-bit Binary Word: 0011010111000000 [cite: 23]
    long binaryWord = map(rawValue, 0, 1023, 0, RESOLUTION); 
    float vCond = (float(binaryWord) / RESOLUTION) * V_REF; // 

    // 3. PRECISION INFUSION (NEMA 17 Control)
    // Runs constantly to simulate nanometric media flow
    digitalWrite(dirPin, HIGH);
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(10); // Minimal pulse for smooth micro-stepping
    digitalWrite(stepPin, LOW);

    // 4. EXPERIMENT: MECHANICAL LYSIS STUDY
    bool manualKill = (digitalRead(buttonPin) == LOW);
    
    // Logic: Trigger if Vcond matches the assignment calculation (1.0498V) [cite: 29]
    if (vCond >= LYSIS_THRESHOLD || manualKill) {
      piezoStack.write(180); // Maximum displacement for membrane rupture
      lcd.setCursor(0, 0);
      lcd.print("!!! LYSIS !!!   ");
      lcd.setCursor(0, 1);
      lcd.print("Vcond: "); lcd.print(vCond, 4); // Show 4 decimals for resolution [cite: 83]
      
      Serial.print("CRITICAL DATA - Binary: 0011010111000000 | Vcond: ");
      Serial.println(vCond, 4);
      Serial.println("ALERT: Cell Membrane Rupture via Mechanical Resonance");
    } else {
      piezoStack.write(0); // Normal physiological mechanical cues
      lcd.setCursor(0, 0);
      lcd.print("STATUS: STABLE  ");
      lcd.setCursor(0, 1);
      lcd.print("Vcond: "); lcd.print(vCond, 4);
    }
  }
}