ARDUINO PROJECT: LED LIGHT PATTERNS -- LED图案编程| AWESOME DAVID BLOG

ARDUINO PROJECT: LED LIGHT PATTERNS -- LED图案编程

Posted 2018-12-26 Views

LED Light Project as the most basic Arduino project has its simplicity, flexibility, and extensibility. It is easy and friendly for a new learner to get hands-on Arduino programming experience. The following tutorial will introduce several LED Light Projects from basic to advanced.

Board: Arduino Uno / Arduino Educato

LED: Single LED Light Bulbs

Resistor: 220 OHM / 1K OHM

Single LED Blink-- 单个LED闪烁

Open your Arduino IDE, go to File -> Examples -> 01.Basics -> Blink, it is a code can blink the led on Arduino board:

直接打开Arduino的IDE应用程序，File -> Examples -> 01.Basics -> Blink 就是一个可以让Uno板上LED闪烁的代码：

// set up led pin
int led = 13; 

void setup() {                
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);     
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);               // wait for a second
}


You can adjust the example to build your own led blink pattern, for example:


void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(20);               // wait for 20/1000 second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(200);               // wait for 200/1000 second
}

Single LED Fade -- 单个LED呼吸灯

Fade an LED need using the analogWrite() function instead of digitalWrite(). The analogWrite() function uses PWM to simulate analog signal. The PWM capable pins on Uno are identified with a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11. The signal range of a PWM pin is from 0 to 255.

int led = 9;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  // set the brightness of pin 9:
  analogWrite(led, brightness);

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  // wait for 30 milliseconds to see the dimming effect
  delay(30);
}

Adjust fadeAmount and delay to change the led fading speed.

Multiple LED Blink -- 多个LED 闪烁

Adding more LEDs to your board, and make them blink in different patterns.

Six LEDs Blink in order -- Pattern 1:

void setup(){
  unsigned char i;
  for(i = 1; i<=6; i++)
    pinMode(i,OUTPUT);
}

void loop(){
  unsigned char j;
  for(j=1; j<=6; j++){
    digitalWrite(j, HIGH);
    delay(200);
   }

  for(j=6; j>=1; j--){
    digitalWrite(j,LOW);
    delay(200);
   }
}

Six LEDs Blick in order -- Pattern 2:

void setup(){
  unsigned char i;
  for(i = 1; i<=6; i++)
    pinMode(i,OUTPUT);
}

void loop(){
  unsigned char j, k;
  k = 5;
  for(j=1; j<=3; j++){
    digitalWrite(j, HIGH);
    digitalWrite(j+k, HIGH);
    delay(400);
    digitalWrite(j, LOW);
    digitalWrite(j + k, LOW);
    k -= 2;
  }
  k = 3;
  for(j=2;j>=1;j--){
    digitalWrite(j,HIGH);
    digitalWrite(j+k,HIGH);
    delay(400);
    digitalWrite(j,LOW);
    digitalWrite(j+k,LOW);
    k+=2;
  }
}

If we want to combine these two patterns in a single script, we'd better make a function for each pattern so the code is more organized:

void style_1(void){
  unsigned char j;
  for(j=1; j<=6; j++){
    digitalWrite(j, HIGH);
    delay(200);
   }

  for(j=6; j>=1; j--){
    digitalWrite(j,LOW);
    delay(200);
   }
}

void style_2(void){
  unsigned char j, k;
  k = 5;
  for(j=1; j<=3; j++){
    digitalWrite(j, HIGH);
    digitalWrite(j+k, HIGH);
    delay(400);
    digitalWrite(j, LOW);
    digitalWrite(j + k, LOW);
    k -= 2;
  }
  k = 3;
  for(j=2;j>=1;j--){
    digitalWrite(j,HIGH);
    digitalWrite(j+k,HIGH);
    delay(400);
    digitalWrite(j,LOW);
    digitalWrite(j+k,LOW);
    k+=2;
  }
}

void setup(){
  unsigned char i;
  for(i = 1; i<=6; i++)
    pinMode(i,OUTPUT);
}

void loop(){
  style_1();
  style_2();
}

Ten LEDs with Eight Patterns Switched by a Button -- 十LED八图案一按钮控制

In order to control the switch of led patterns, a Momentary Switch was added. See here, know how to connect a button to your board. Try following code, see if you can create more interesting pattern by 10 LEDs:

int buttonPin = 2; // set switch button pin
int buttonPushCounter = 0; // counter to count the button been pushed
int buttonState = 0; // current button state
int lastButtonState = 0; // last button state

// 10 led pins are from pin 4 to pin 13, 8 functions to represent 8 patterns

void style_1(void) {
  unsigned char j;
  for(j=4; j<=13; j++){
    digitalWrite(j, HIGH);
  }
  delay(100);

  for(j=4; j<=13; j++){
    digitalWrite(j, LOW);
  }
  delay(100);
}

void style_2(void){
  unsigned char j;
  for(j=4; j<=13; j++){
    digitalWrite(j, HIGH);
    delay(20);
    digitalWrite(j, LOW);
    delay(20);
  }

  for(j=12; j>=4; j--){
    digitalWrite(j, HIGH);
    delay(20);
    digitalWrite(j, LOW);
    delay(20);
  }
  delay(20);
}

void style_3(void) {
  unsigned char j;
  for(j=4; j<=13; j+=2){
    digitalWrite(j, HIGH);
    delay(20);
  }
  for(j=13; j>=4; j-=2){
    digitalWrite(j, HIGH);
    delay(20);
  }
  for(j=5; j<=13; j+=2){
    digitalWrite(j, LOW);
    delay(20);
  }
  for(j=12; j>=4; j-=2){
    digitalWrite(j, LOW);
    delay(20);
  }
  delay(20);
}

void style_4(void) {
  unsigned char j;
  for(j=4; j<=13;j++) {
    digitalWrite(j, HIGH);
    delay(20);
  }
  for(j=13; j>=4;j--) {
    digitalWrite(j, LOW);
    delay(20);
  }
  delay(20);
}

void style_5(void) {
  unsigned char j, k;
  k=1;
  for(j=8; j>=4; j--) {
    digitalWrite(j, HIGH);
    digitalWrite(j+k,HIGH);
    delay(20);
    k += 2;
  }
  k=9;
  for (j=4; j<=8; j++) {
    digitalWrite(j,LOW);
    digitalWrite(j+k,LOW);
    delay(20);
    k -= 2;
  }
  delay(20);
}

void style_6(void) {
  unsigned char j,k;
  k=9;
  for(j=4; j<=8; j++) {
    digitalWrite(j,HIGH);
    digitalWrite(j+k, HIGH);
    delay(20);
    digitalWrite(j,LOW);
    digitalWrite(j+k, LOW);
    k-=2;
  }
  k=3;
  for(j=7; j>=4; j--) {
    digitalWrite(j,HIGH);
    digitalWrite(j+k, HIGH);
    delay(20);
    digitalWrite(j,LOW);
    digitalWrite(j+k, LOW);
    k+=2;
  }
  delay(20);
}

void style_7(void) {
  unsigned char i;
  unsigned char n;
  for(i=5; i>=1; i--) {
    for(n=i; n>=1; n--) {
      style_1();
    }
    delay(400);
  }
  delay(20);
}

void style_8(void) {
  unsigned int i;
  for(i=0; i<255; i+=2) {
    analogWrite(9, i);
    analogWrite(10, i);
    analogWrite(11, i);
    delay(20);
  }

  for(i=255; i>0; i-=2) {
    analogWrite(9, i);
    analogWrite(10, i);
    analogWrite(11, i);
    delay(20);
  }
  delay(20);
}

void setup() {
  unsigned char i;
  for(i=4; i<=13; i++) {
    pinMode(i,OUTPUT);
  }  
   pinMode(buttonPin, INPUT);
   pinMode(A3, OUTPUT);
}

void loop() {
  buttonState=digitalRead(buttonPin);
  if(buttonState != lastButtonState){
    if(buttonState == HIGH){
      buttonPushCounter++;
      if(buttonPushCounter>8){
        buttonPushCounter = 1;
      }}}else{

      if(buttonPushCounter == 1) {
          style_1();
          delay(50);
        }

      if(buttonPushCounter == 2) {
          style_2();
          delay(50);
        }

      if(buttonPushCounter == 3) {
          style_3();
          delay(50);
        }

      if(buttonPushCounter == 4) {
          style_4();
          delay(50);
        }

      if(buttonPushCounter == 5) {
          style_5();
          delay(50);
        }

      if(buttonPushCounter == 6) {
          style_6();
          delay(50);
        }

      if(buttonPushCounter == 7) {
          style_7();
          delay(50);
        }
      if(buttonPushCounter == 8) {
          style_8();
          delay(50);
        }
      }
  lastButtonState = buttonState;
}

The code above could be simplified by a function array to include all the patterns in, and add randomness to break the order when pushing the button.