Week 7 - Journal

Making on Tinkercad

I used Tinker CAD to design the circuit to ensure the wiring 

Hint: I used a PIR sensor instead of light sensor, which I used in the real circuit because it isn't found in TinkerCAD

relay module (output )

• first, I cut one of the parts from the LED and connected it to the CM & NC 

Ultrasonic sensor 

• the red wire connected to 5V of the Arduino

• the black wire connected to the GND 

• the purple wire "echo" connected to pin 3

• the blue wire "

Light sensor (input) 

• the red wire connected to 5V of the Arduino

• the black wire connected to the GND 

• the purple wire connected to A0

LCD (output)

• the white wire connected to 5V of the Arduino

• the black wire connected to the GND 

• the blue wire" SDA" connected to A4

• the green wire "SCL" connected to A5

putting them in the enclosure 

• I used yellow tape to fix the component 

• I cut part from the cardboard to pass the wires of the lamp 

const int echoPin = 3;    

const int trigPin = 4;    

// in ultrasonic sensor  

const int ledPin = 8;

//which connected to relay module

const int sensorPin = A0;//light sensor

float time = 0;

float distance = 0;

//to calculate the equation of ultra sonic sensor

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {

  // put your setup code here, to run once:

  Serial.begin(9600);

  pinMode(sensorPin, INPUT);

  pinMode(ledPin, OUTPUT);

  pinMode(echoPin, INPUT);

  pinMode(trigPin, OUTPUT);

  lcd.init();

  lcd.init();

}

void loop() {

  // put your main code here, to run repeatedly:

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  time = pulseIn(echoPin, HIGH, 30000);

  distance = time / 58.0;

  //the equation of ultrasonic sensor

  int sensorValue = analogRead(sensorPin);

  if (sensorValue >= 900) {

    if (distance <= 2) {

      digitalWrite(ledPin, LOW);

      Serial.println(sensorValue);

      lcd.backlight();

      lcd.setCursor(0, 0);

      lcd.print("  STUDY HARD! ");

      lcd.setCursor(0, 1);

      lcd.print("led on ");

      delay(1000);

    } else {

      digitalWrite(ledPin, HIGH);

      Serial.println(sensorValue);

      lcd.backlight();

      lcd.setCursor(0, 0);

      lcd.print("  Waiting you ");

      lcd.setCursor(0, 1);

      lcd.print("led off");

    }

  } else {

    digitalWrite(ledPin, HIGH);

    Serial.println(sensorValue);

    lcd.backlight();

    lcd.setCursor(0, 0);

    lcd.print("No need for me");

  }

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");

  delay(500);

}

const int echoPin = 3;    

const int trigPin = 4;    

// in ultrasonic sensor  

const int ledPin = 8;

//which connected to relay module

const int sensorPin = A0;//light sensor

float time = 0;

float distance = 0;

//to calculate the equation of ultra sonic sensor

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {

  // put your setup code here, to run once:

  Serial.begin(9600);

  pinMode(sensorPin, INPUT);

  pinMode(ledPin, OUTPUT);

  pinMode(echoPin, INPUT);

  pinMode(trigPin, OUTPUT);

  lcd.init();

  lcd.init();

}

void loop() {

  // put your main code here, to run repeatedly:

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  time = pulseIn(echoPin, HIGH, 30000);

  distance = time / 58.0;

  //the equation of ultrasonic sensor

  int sensorValue = analogRead(sensorPin);

  if (sensorValue >= 900) {

    if (distance <= 2) {

      digitalWrite(ledPin, LOW);

      Serial.println(sensorValue);

      lcd.backlight();

      lcd.setCursor(0, 0);

      lcd.print("  STUDY HARD! ");

      lcd.setCursor(0, 1);

      lcd.print("led on ");

      delay(1000);

    } else {

      digitalWrite(ledPin, HIGH);

      Serial.println(sensorValue);

      lcd.backlight();

      lcd.setCursor(0, 0);

      lcd.print("  Waiting you ");

      lcd.setCursor(0, 1);

      lcd.print("led off");

    }

  } else {

    digitalWrite(ledPin, HIGH);

    Serial.println(sensorValue);

    lcd.backlight();

    lcd.setCursor(0, 0);

    lcd.print("No need for me");

  }

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");

  delay(500);

}

The final project