[Arduino] Illuminance (Photocell) and Ultrasonic Sensor

더 재밌게 놀기 연구소

※ Illuminance sensor with LED

Need to use Analog pin of Arduino

Analog input pins

AnalogRead

Circuit

Source Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:
  analogWrite(9,map(analogRead(A0),0,1023,0,255);
}

※ Illuminance sensor with Buzzer

Circuit

Source Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:
  tone(8,map(analogRead(A0),0,1023,31,4978),20);
  delay(500);
}

Youtube Tutorial of above examples (in Korean) : https://www.youtube.com/watch?v=w397cxZQ5IA&index=6&list=PL0Vl139pNHbe-JlsydLg3NFRk6nC_cC7w

※ Ultrasonic Sensor with LED

Circuit

Source Code

#define TRIG 2
#define ECHO 3
#define RED 11
#define RED2 12
#define GREEN 10
#define BLUE 9


void setup() {
  // put your setup code here, to run once:
  pinMode(TRIG, OUTPUT);
  pinMode(ECHO, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(TRIG,LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG,HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG,LOW);

  long distance = pulseIn(ECHO, HIGH)/58.2;

  analogWrite(RED, 0);
  analogWrite(GREEN, 0);
  analogWrite(BLUE, 0);

  if(distance < 10) {
    analogWrite(RED2,255);
  }else if(distance < 20) {
    analogWrite(GREEN,255);
    analogWrite(RED2,0);
  } else if(distance < 30) {
    analogWrite(BLUE,255);
    analogWrite(RED2,0);
  }

  delay(100);
}

Note : Red of 3 color LED of mine is not working properly so I've added Red LED to port number 12.

※ Ultrasonic Sensor with Buzzer

Circuit

Source Code

#define TRIG 2
#define ECHO 3

void setup() {
  // put your setup code here, to run once:
  pinMode(TRIG, OUTPUT);
  pinMode(ECHO, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(TRIG,LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG,HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG,LOW);

  long distance = pulseIn(ECHO, HIGH)/58.2;

  tone(4,1000,20);
  delay(100);
  tone(4,1000,20);

  delay(distance);
}

Youtube Tutorial of above examples (in Korean) : https://www.youtube.com/watch?v=XzNHUctzjOM&list=PL0Vl139pNHbe-JlsydLg3NFRk6nC_cC7w&index=7

Application

Let's add some more LEDs and make Buzzer Piano with Ultrasonic sensor. Wow

#define TRIG 2
#define ECHO 3
#define RED 11
#define RED2 12
#define GREEN 10
#define GREEN2 7
#define YELLOW 8
#define BLUE 9
#define BLUE2 5
#define NOTE_C4 262
#define NOTE_D4 294
#define NOTE_E4 330
#define NOTE_F4  349
#define NOTE_G4  392
#define NOTE_A4  440

int pins[] = {2,3,4};
int notes[] = {NOTE_E4, NOTE_D4, NOTE_C4};


void setup() {
  // put your setup code here, to run once:
  pinMode(TRIG, OUTPUT);
  pinMode(ECHO, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(TRIG,LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG,HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG,LOW);

  long distance = pulseIn(ECHO, HIGH)/58.2;

  analogWrite(RED, 0);
  analogWrite(GREEN, 0);
  analogWrite(BLUE, 0);

  if(distance < 10) {
    analogWrite(RED2,255);
    tone(4,NOTE_C4,20);
  }else if(distance < 15) {
    analogWrite(GREEN,255);
    analogWrite(BLUE2,0);
    analogWrite(RED2,0);
    analogWrite(YELLOW,0);
    analogWrite(GREEN2,0);
    tone(4,NOTE_D4,20);
  } else if(distance < 20) {
    analogWrite(BLUE,255);
    analogWrite(BLUE2,0);
    analogWrite(RED2,0);
    analogWrite(YELLOW,0);
    analogWrite(GREEN2,0);
    tone(4,NOTE_E4,20);
  } else if(distance < 25) {
    analogWrite(YELLOW,255);
    analogWrite(BLUE2,0);
    analogWrite(RED2,0);
    analogWrite(GREEN2,0);
    tone(4,NOTE_F4,20);
  } else if(distance < 30) {
    analogWrite(GREEN2,255);
    analogWrite(BLUE2,0);
    analogWrite(RED2,0);
    analogWrite(YELLOW,0);
    tone(4,NOTE_G4,20);
  } else if(distance < 30) {
    analogWrite(BLUE2,255);
    analogWrite(RED2,0);
    analogWrite(YELLOW,0);
    analogWrite(GREEN2,0);
    tone(4,NOTE_A4,20);
  }

  delay(100);
}