Week 6- Journal

my idea is parking sensor

i was inspired by EOweek activity (waving hand)

i learn about how to use the ultrasonic sensor , it was great to try it again as an approach to my project idea 

1- from output choose (print to serial monitor) to enable me to see values of distance

2- from input choose ( read ultrasonic distance sensor )

3- i set the pins as it is in the breadboard 4& 5

4- from math choose comparison block then duplicate the previous block to it

5-i set the distance to greater than 10 cm

6- i add the green block to if block from control

7-from output choose set pin 3 to high (to make the light on when the  distance is greater than 10 cm  ) 

8-from output choose set pin 3 to high (to make the buzzer on when the  distance is greater than 10 cm  ) 

9- wait 100 m.s then set them low to make the effect of blinking

in order to blink faster if the distance is less than 10cm i repeat all blocks again from 2to9 and change the distance to less than 10cm

10- l repeat the blocks from2 to 8 and set the distance more than 20 and set the pins low in order to make light and sound off if the body go further 

now i'm ready to simulate ....

// C++ code

//

int set_input = 0;

int input = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)

{

  pinMode(triggerPin, OUTPUT);  // Clear the trigger

  digitalWrite(triggerPin, LOW);

  delayMicroseconds(2);

  // Sets the trigger pin to HIGH state for 10 microseconds

  digitalWrite(triggerPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin, LOW);

  pinMode(echoPin, INPUT);

  // Reads the echo pin, and returns the sound wave travel time in microseconds

  return pulseIn(echoPin, HIGH);

}

void setup()

{

  Serial.begin(9600);

  pinMode(3, OUTPUT);

  pinMode(7, OUTPUT);

}

void loop()

{

  Serial.println(0.01723 * readUltrasonicDistance(4, 5));

  if (0.01723 * readUltrasonicDistance(4, 5) >= 5) {

    digitalWrite(3, HIGH);

    digitalWrite(7, HIGH);

    delay(100); // Wait for 100 millisecond(s)

    digitalWrite(3, LOW);

    digitalWrite(7, LOW);

    delay(100); // Wait for 100 millisecond(s)

  }

  if (0.01723 * readUltrasonicDistance(4, 5) < 5) {

    digitalWrite(3, HIGH);

    digitalWrite(7, HIGH);

    delay(10); // Wait for 10 millisecond(s)

    digitalWrite(3, LOW);

    digitalWrite(7, LOW);

    delay(10); // Wait for 10 millisecond(s)

  }

  if (0.01723 * readUltrasonicDistance(4, 5) > 10) {

    digitalWrite(3, LOW);

    digitalWrite(7, LOW);

  }

} 

• my first challenge was  how to  simulate the distance by moving ball , i tried to set the serial monitor it helps me to check it well

i use try and eror

• 2nd challenge was when i tried the real circuit  , the sensor was active all times because there are many things around it in my room , i decrease the distances to half values it works better 

 this week i think i can imagin how my project will work and what sensors i will need