#include <Arduino.h>

// Define DRV8833 Control Pins mapped in Wokwi
const int VALVE_PIN_1 = 18;
const int VALVE_PIN_2 = 19;

// Solenoid pulse duration in milliseconds
const int PULSE_DURATION_MS = 500; // Extended slightly for visual clarity in simulation

// Function to control the latching valve polarity
void triggerValve(bool open) {
  if (open) {
    digitalWrite(VALVE_PIN_1, HIGH);
    digitalWrite(VALVE_PIN_2, LOW);
    Serial.println("-> Polarity: OPEN pulse sent (Pin 1 HIGH, Pin 2 LOW)");
  } else {
    digitalWrite(VALVE_PIN_1, LOW);
    digitalWrite(VALVE_PIN_2, HIGH);
    Serial.println("-> Polarity: CLOSE pulse sent (Pin 1 LOW, Pin 2 HIGH)");
  }
  
  // Keep pulse short to protect coil
  delay(PULSE_DURATION_MS);
  
  // Cut all power (High-Impedance state to save battery)
  digitalWrite(VALVE_PIN_1, LOW);
  digitalWrite(VALVE_PIN_2, LOW);
  Serial.println("-> Power cut: Driver in standby (0V across valve)\n");
}

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("=== Low-Battery Irrigation Controller Initialized ===");

  pinMode(VALVE_PIN_1, OUTPUT);
  pinMode(VALVE_PIN_2, OUTPUT);
  digitalWrite(VALVE_PIN_1, LOW);
  digitalWrite(VALVE_PIN_2, LOW);
}

void loop() {
  // 1. Simulate a trigger event (e.g., from weather/schedule)
  Serial.println("Opening valve for watering cycle...");
  triggerValve(true);

  // Simulated watering window (shortened to 5 seconds for simulation)
  delay(5000); 

  // 2. Close the valve
  Serial.println("Closing valve to save water...");
  triggerValve(false);

  // Sleep interval before next cycle (shortened to 10 seconds for simulation)
  Serial.println("Entering deep sleep / idle state for 10 seconds...\n");
  delay(10000);
}