Smart Bin

1#include <Servo.h>
2#include <LiquidCrystal.h>
3
4// LCD pins: RS, E, D4, D5, D6, D7
5LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
6
7Servo lidServo;
8
9// PING))) ultrasonic sensors
10const int handSensorPin = 12;   // front sensor for hand detection
11const int fullSensorPin = 13;   // inside sensor for bin full detection
12
13// Actuators
14const int servoPin = A0;
15
16const int redPin = 9;
17const int greenPin = 11;
18const int bluePin = 10;
19
20// Distance settings in cm
21const int handDistance = 50;  // hand detected if closer than 20 cm
22const int fullDistance = 20;   // bin full if trash is closer than 8 cm
23
24void setup() {
25  lcd.begin(16, 2);
26
27  lidServo.attach(servoPin);
28  lidServo.write(0); // lid closed
29
30  pinMode(redPin, OUTPUT);
31  pinMode(greenPin, OUTPUT);
32  pinMode(bluePin, OUTPUT);
33
34  lcd.clear();
35  lcd.setCursor(0, 0);
36  lcd.print("Smart Trash Bin");
37  lcd.setCursor(0, 1);
38  lcd.print("Starting...");
39  delay(2000);
40}
41
42void loop() {
43  int handDist = readPing(handSensorPin);
44  int fullDist = readPing(fullSensorPin);
45
46  bool binFull = fullDist > 0 && fullDist <= fullDistance;
47  bool handDetected = handDist > 0 && handDist <= handDistance;
48
49  if (binFull) {
50    setRGB(255, 0, 0); // red
51
52    lcd.clear();
53    lcd.setCursor(0, 0);
54    lcd.print("BIN FULL");
55    lcd.setCursor(0, 1);
56    lcd.print("Please Empty");
57
58    lidServo.write(0); // keep closed
59  } 
60  else {
61    setRGB(0, 255, 0); // green
62
63    if (handDetected) {
64      lidServo.write(90);   // open lid
65
66	lcd.clear();
67	lcd.setCursor(0,0);
68	lcd.print("Lid Open");
69	
70	lcd.setCursor(0,1);
71	lcd.print("Throw Trash");
72
73	delay(3000);   // keep lid open for 3 sec
74
75	lcd.clear();
76	lcd.setCursor(0,0);
77	lcd.print("Remove Hand");
78
79	lcd.setCursor(0,1);
80	lcd.print("Closing Lid");
81	
82	delay(1500);   // let user read message
83
84	lidServo.write(0);    // close lid
85
86	delay(1000);
87	lcd.clear();
88      
89    } 
90    else {
91      lcd.setCursor(0, 0);
92      lcd.print("Smart Bin Ready ");
93      lcd.setCursor(0, 1);
94      lcd.print("Not Full        ");
95    }
96  }
97
98  delay(300);
99}
100
101// Function for PING))) sensor
102int readPing(int pin) {
103  long duration;
104  int distance;
105
106  pinMode(pin, OUTPUT);
107  digitalWrite(pin, LOW);
108  delayMicroseconds(2);
109  digitalWrite(pin, HIGH);
110  delayMicroseconds(5);
111  digitalWrite(pin, LOW);
112
113  pinMode(pin, INPUT);
114  duration = pulseIn(pin, HIGH, 30000);
115
116  if (duration == 0) {
117    return -1;
118  }
119
120  distance = duration / 29 / 2;
121  return distance;
122}
123
124// RGB LED control
125void setRGB(int redValue, int greenValue, int blueValue) {
126  analogWrite(redPin, redValue);
127  analogWrite(greenPin, greenValue);
128  analogWrite(bluePin, blueValue);
129}