#include <Arduino.h>

// Ultrasonic sensor pins
const int biodegradableTriggerPin = 18;
const int biodegradableEchoPin = 19;
const int fillLevelTriggerPin = 20;
const int fillLevelEchoPin = 21;

// Thresholds (in millimeters)
const int biodegradableThreshold = 100; // 10 cm
const int fillLevelThreshold = 200;     // 20 cm

// Function to classify waste type
bool isBiodegradable(int distance) {
    return distance < biodegradableThreshold;
}

// Function to check fill level
bool isBinFull(int fillDistance) {
    return fillDistance < fillLevelThreshold;
}

void setup() {
    Serial.begin(9600);
    // Initialize sensor pins and other setup
}

void loop() {
    // Simulated distances (replace with actual sensor readings)
    int biodegradableDistance = 85; // Example: biodegradable waste detected
    int fillLevelDistance = 180;    // Example: bin almost full

    if (isBiodegradable(biodegradableDistance)) {
        // Biodegradable waste detected
    } else if (isBinFull(fillLevelDistance)) {
        // Bin almost full
        // Add code to trigger message/alert here
    } else {
        // Non-biodegradable waste detected
    }

    // Add sound recognition logic here (external libraries or services)

    // Other tasks...
}