How To Make An Automatic Trash Bin Using Cardboard

Learn how to build an automatic trash bin using the ultrasonic sensor, a servo motor, and cardboard.

May 26, 2022

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environmental sensing

home automation

recycling

Devices & Components

Arduino Uno Rev3

SG90 Micro-servo motor

Jumper wires (generic)

Ultrasonic Sensor - HC-SR04 (Generic)

Cardboard

Hardware & Tools

Scissor, Electrician

Barbecue stick

Hot glue gun (generic)

Project description

Code

Trash bin

arduino

This is the code I wrote for this project. You need to install the Servo library if you don't have it on your Arduino IDE. Modify the openCloseDelay value to make the lid open and close faster or slower.

1#include <Servo.h>
2
3int servo = 7 ;
4int trigger = 8;
5int echo  = 9;
6int angle = 90;
7int servoDelay = 2;
8int sensorDelay = 10;
9int openCloseDelay  = 2000;
10long duration = 0;
11float distance = 0;
12
13Servo myServo;
14
15void  setup() {
16  Serial.begin(9600);
17  pinMode(trigger, OUTPUT);
18  pinMode(echo,  INPUT);
19
20  digitalWrite(servo, LOW);
21  digitalWrite(trigger, LOW);
22
23  myServo.attach(servo);
24  myServo.write(angle);
25}
26
27void loop() {
28  delay(sensorDelay);
29  digitalWrite(trigger, HIGH);
30  delay(sensorDelay);
31  digitalWrite(trigger, LOW);
32  duration = pulseIn(echo, HIGH);
33  distance  = duration * 0.034 / 2;
34  Serial.println(distance);
35
36  if (distance <=  50.0) {
37    angle = 0;
38    myServo.write(angle);
39    delay(openCloseDelay);  
40  } else {
41    angle = 90;
42    myServo.write(angle);
43    delay(openCloseDelay);  
44  }
45}
46

#include <Servo.h>

int servo = 7 ;
int trigger = 8;
int echo  = 9;
int angle = 90;
int servoDelay = 2;
int sensorDelay = 10;
int openCloseDelay  = 2000;
long duration = 0;
float distance = 0;

Servo myServo;

void  setup() {
  Serial.begin(9600);
  pinMode(trigger, OUTPUT);
  pinMode(echo,  INPUT);

  digitalWrite(servo, LOW);
  digitalWrite(trigger, LOW);

  myServo.attach(servo);
  myServo.write(angle);
}

void loop() {
  delay(sensorDelay);
  digitalWrite(trigger, HIGH);
  delay(sensorDelay);
  digitalWrite(trigger, LOW);
  duration = pulseIn(echo, HIGH);
  distance  = duration * 0.034 / 2;
  Serial.println(distance);

  if (distance <=  50.0) {
    angle = 0;
    myServo.write(angle);
    delay(openCloseDelay);  
  } else {
    angle = 90;
    myServo.write(angle);
    delay(openCloseDelay);  
  }
}

Downloadable files

Trash bin schematics

The sensor is supplied by 5V and the servo is connected to 3.3V pin.

Trash bin schematics

The sensor is supplied by 5V and the servo is connected to 3.3V pin.

Trash bin schematics

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