[아두이노] 7 Segment LED(1 Digit LED)로 숫자 표시하기

숫자 1글자를 표현할 수 있는 7개 LED가 집적된 부품을 7 Segment LED라고 한다.

아두이노를 통하여 이를 제어해 보겠다.

7 Segment LED의 모습

핀은 아래와 위에 각각 5개씩 총 10개를 가지고 있다.

5161AS 데이터시트:

20140808115002555.pdf

위의 그림과 같이 A~G까지 7개의 LED로 구성되어 있다.

위와 아래의 10개의 핀 중 가운데 핀인 3, 8번은 GND (Ground)이다. 나머지 핀들에 digitalWrite 를 HIGH 하면 켜지게 되고 LOW면 꺼지게 된다. 예를 들어 6, 4를 HIGH 나머지를 LOW하게되면 숫자 1을 표시할 수 있는 것이다.

아두이노와의 연결은 다음과 같다.

GND는 3,8번 핀이다. 여기에 LED 보호를 위해 220Ω 저항을 달아주었다.

나머지 핀들은 위와 같이 연결하면 된다.

fritzing 파일:

7segment.fzz

## 소스 ##

A~F, 0~9까지를 순차적으로 7 Segment LED에 표시하는 소스

#define ledA 8
#define ledB 9
#define ledC 2
#define ledD 3
#define ledE 4
#define ledF 6
#define ledG 5
 
void setup()
{
  //각각의 핀들을 OUTPUT으로 설정해 준다.
  pinMode(ledA, OUTPUT);
  pinMode(ledB, OUTPUT);
  pinMode(ledC, OUTPUT);
  pinMode(ledD, OUTPUT);
  pinMode(ledE, OUTPUT);
  pinMode(ledF, OUTPUT);
  pinMode(ledG, OUTPUT);
  Serial.begin(9600);  //시리얼 모니터 설정.
}
 
void loop()
{
  Serial.println("Starting\n");
  LoopDisplay();    //LoopDisplay 함수 실행.
}
 
/*
A~F, 0~9까지 표시하는 함수
7개의 LED를 HIGH(켜짐)/LOW(꺼짐)으로 설정하여 표시한다.
*/
void clr()
{
  //Clears the LED
  digitalWrite(ledA, LOW);
  digitalWrite(ledB, LOW);
  digitalWrite(ledC, LOW);
  digitalWrite(ledD, LOW);
  digitalWrite(ledE, LOW);
  digitalWrite(ledF, LOW);
  digitalWrite(ledG, LOW);
}
 
 
void char_A()
{
  digitalWrite(ledD, LOW);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void char_B()
{
  //Displays B
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void char_C()
{
  //Displays C
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, LOW);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, LOW);
  digitalWrite(ledC, LOW);
}
 
void char_D()
{
  //Displays D
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, LOW);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void char_E()
{
  //Displays E
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, LOW);
  digitalWrite(ledC, LOW);
}
 
void char_F()
{
  //Displays F
  digitalWrite(ledD, LOW);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, LOW);
  digitalWrite(ledC, LOW);
}
 
 
void one()
{
  //Displays 1
  digitalWrite(ledD, LOW);
  digitalWrite(ledE, LOW);
  digitalWrite(ledF, LOW);
  digitalWrite(ledG, LOW);
  digitalWrite(ledA, LOW);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void two()
{
  //Displays 2
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, LOW);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, LOW);
}
 
void three()
{
  //Displays 3
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, LOW);
  digitalWrite(ledF, LOW);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void four()
{
  //Displays 4
  digitalWrite(ledD, LOW);
  digitalWrite(ledE, LOW);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, LOW);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void five()
{
  //Displays 5
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, LOW);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, LOW);
  digitalWrite(ledC, HIGH);
}
 
void six()
{
  //Displays 6
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, LOW);
  digitalWrite(ledC, HIGH);
}
 
void seven()
{
  //Displays 7
  digitalWrite(ledD, LOW);
  digitalWrite(ledE, LOW);
  digitalWrite(ledF, LOW);
  digitalWrite(ledG, LOW);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void eight()
{
  //Displays 8
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void nine()
{
  //Displays 9
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, LOW);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, HIGH);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
void zero()
{
  //Displays 0
  digitalWrite(ledD, HIGH);
  digitalWrite(ledE, HIGH);
  digitalWrite(ledF, HIGH);
  digitalWrite(ledG, LOW);
  digitalWrite(ledA, HIGH);
  digitalWrite(ledB, HIGH);
  digitalWrite(ledC, HIGH);
}
 
//모든 문자와 숫자를 순서대로 Display한다.
void LoopDisplay()
{
  char_A();
  delay(1000);
  char_B();
  delay(1000);
  char_C();
  delay(1000);
  char_D();
  delay(1000);
  char_E();
  delay(1000);
  char_F();
  delay(1000);
  one();
  delay(1000);
  two();
  delay(1000);
  three();
  delay(1000);
  four();
  delay(1000);
  five();
  delay(1000);
  six();
  delay(1000);
  seven();
  delay(1000);
  eight();
  delay(1000);
  nine();
  delay(1000);
  zero();
  delay(1000);
}

##결과1##