TINKER CAD Software: (Design the circuit)

• I have designed the circuit on tinker cad to see if is going to work or not

• I brought my components and start to wire them

• laid the breadboard

• laid the arduino

• powered the breadboard by wiring the (+) to the (5v) pin of the arduino and (-) to the ground of the arduino.

• put the red LEDs

• added the resistors and wired the first leg at the anode legs of the LEDs

• wired the other leg to the pins (3,4) of the arduino.

• added an ultrasonic sensor and wire it's

1-(vcc) to the (+) of the breadboard

2-ground to the (-) of the breadboard

3- echo to pin(10) of the arduino

4-tris to pin (11) of the arduino

Buzzer

ground to the (-) of the breadboard

positive to pin A0 of the arduino

Programing and Coding :

• I used arduino ide

• stared to build the code

• wrote the void setup syntax for arduino input-output pins and lcd setup.....

• #include <LiquidCrystal_I2C.h>

• 
  

LiquidCrystal_I2C lcd(0x27, 16, 2);

long readUltrasonicDistance(int triggerPin, int echoPin)

{

pinMode(triggerPin, OUTPUT);

digitalWrite(triggerPin, LOW);

delayMicroseconds(2);

digitalWrite(triggerPin, HIGH);

delayMicroseconds(10);

digitalWrite(triggerPin, LOW);

pinMode(echoPin, INPUT);

return pulseIn(echoPin, HIGH);

}

• getting a digital signal from the slider switch make me use if condition the default one is to be shutted down and all pins are low..

void setup()

{

pinMode(6, INPUT);

pinMode(3, OUTPUT);

pinMode(4, OUTPUT);

pinMode(5, OUTPUT);

pinMode(10, OUTPUT);

pinMode(11, OUTPUT);

lcd.init();

lcd.backlight();

lcd.clear();

lcd.setCursor(4,0);

}

• for else i wanted to make 2 conditions with 2 different distances so i used 2 (if condition) .

• the input was 2 different distances (close-veryclose) so I choose for the first condition (CLOSE) is when the input of the 2 pins is =30cm--- the first led will be high, the others will be low and the buzzer is off as you can see and print " NOT ALLOWED " on the screen.

• for the second condition (veryclose) is when the input of the 2 pins is ->20 --- the 2 leds will be high, the buzzer is on as you can see and print " STOP " on the screen.

void loop()

{

if (digitalRead(6)==LOW){

digitalWrite(4,LOW);

digitalWrite(3,LOW);

digitalWrite(5,LOW);

digitalWrite(10,LOW);

digitalWrite(11,LOW);

} else {

if (0.01723 * readUltrasonicDistance(10, 11) > 30) {

digitalWrite(3, HIGH);

digitalWrite(4, LOW);

analogWrite(5, 0);

lcd.setCursor(11,0) ;

lcd.print("NOT ALLOWED");

}

if (0.01723 * readUltrasonicDistance(10, 11) < 20) {

digitalWrite(4, HIGH);

analogWrite(5,150);

delay(1000);

analogWrite(5,50);

delay(1000);

analogWrite(5, 150);

lcd.clear();

lcd.setCursor(2,0) ;

lcd.print("STOP");

}

}

}