5 push bottons lighting up different coolors on an 40xLED matrix.

Projects Programming
1

Hi community, l have made an post awile back but l cant seem to find it. l'm trying to make an toy for my kid, with 5 pushbottons and an LED matrix. lam stuck at the programing part of the toy.

l want each botton to make the LED matrix ligth up in differnt coloors. Red, blue, green, yellow and white.

here is the error l get "expected initializer before 'switch'"

Here is the code l got so far, l'm a littel stuck how to continue from here codewise.

#include <Adafruit_NeoPixel.h>

void startShow(int i);

// Declare and initialise variable for Neopixel brightness
byte neoBright = 5;

#define BUTTON_PIN1   2    

#define BUTTON_PIN2   3
 
#define BUTTON_PIN3   4

#define BUTTON_PIN4   5

#define BUTTON_PIN5   6

#define PIXEL_PIN    10    

#define PIXEL_COUNT 40



Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

bool oldState = HIGH;
int showType = 0;

void setup() {
  pinMode(BUTTON_PIN1, INPUT_PULLUP);
  pinMode(BUTTON_PIN2, INPUT_PULLUP);
  pinMode(BUTTON_PIN3, INPUT_PULLUP);
  pinMode(BUTTON_PIN4, INPUT_PULLUP);
  pinMode(BUTTON_PIN5, INPUT_PULLUP);
  strip.begin();
  strip.setBrightness(neoBright); 
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {
  // Get current button state.
  bool newState1 = digitalRead(BUTTON_PIN1);
  bool newState2 = digitalRead(BUTTON_PIN2);
  bool newState3 = digitalRead(BUTTON_PIN3);
  bool newState4 = digitalRead(BUTTON_PIN4);
  bool newState5 = digitalRead(BUTTON_PIN5);

  if (newState1 == LOW && oldState == HIGH) {
    delay(20);
    newState1 = digitalRead(BUTTON_PIN1);
  if (newState1 == LOW) {
      showType++;
      if (showType > 9)
        showType=0;
      startShow(showType);
    }
  }
     // Set the last button state to the old state.
  oldState = newState1;


  if (newState2 == LOW && oldState == HIGH) {
    delay(20);
    newState2 = digitalRead(BUTTON_PIN2);
  if (newState2 == LOW) {
      showType++;
      if (showType > 9)
        showType=0;
      startShow(showType);
    }
  }
     // Set the last button state to the old state.
  oldState = newState2;


  if (newState3 == LOW && oldState == HIGH) {
    delay(20);
    newState3 = digitalRead(BUTTON_PIN3);
  if (newState3 == LOW) {
      showType++;
      if (showType > 9)
        showType=0;
      startShow(showType);
    }
  }
    // Set the last button state to the old state.
  oldState = newState1;
   
  if (newState4 == LOW && oldState == HIGH) {
    delay(20);
    newState4 = digitalRead(BUTTON_PIN4);
  if (newState4 == LOW) {
      showType++;
      if (showType > 9)
        showType=0;
      startShow(showType);
    }
  }
  // Set the last button state to the old state.
  oldState = newState4;

  if (newState5 == LOW && oldState == HIGH) {
    delay(20);
    newState5 = digitalRead(BUTTON_PIN5);
  if (newState5 == LOW) {
      showType++;
      if (showType > 9)
        showType=0;
      startShow(showType);
    }
  }
  // Set the last button state to the old state.
  oldState = newState5;

 void startShow(int i) 
  switch(i){
    case 0: colorWipe(strip.Color(0, 0, 0), 50);    // Black/off
            break;
    case 1: colorWipe(strip.Color(255, 0, 0), 50);  // Red
            break;
    case 2: colorWipe(strip.Color(0, 255, 0), 50);  // Green
            break;
    case 3: colorWipe(strip.Color(0, 0, 255), 50);  // Blue
            break;
    case 4: theaterChase(strip.Color(127, 127, 127), 50); // White
            break;
    case 5: theaterChase(strip.Color(127,   0,   0), 50); // Red
            break;
    case 6: theaterChase(strip.Color(  0,   0, 127), 50); // Blue
            break;
    case 7: rainbow(20);
            break;
    case 8: rainbowCycle(20);
            break;
    case 9: theaterChaseRainbow(50);
            break;
  }
}

// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, c);
    strip.show();
    delay(wait);
  }
}

void rainbow(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256; j++) {
    for(i=0; i<strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel((i+j) & 255));
    }
    strip.show();
    delay(wait);
  }
}

// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
    for(i=0; i< strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
    }
    strip.show();
    delay(wait);
  }
}

//Theatre-style crawling lights.
void theaterChase(uint32_t c, uint8_t wait) {
  for (int j=0; j<10; j++) {  //do 10 cycles of chasing
    for (int q=0; q < 3; q++) {
      for (int i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, c);    //turn every third pixel on
      }
      strip.show();

      delay(wait);

      for (int i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, 0);        //turn every third pixel off
      }
    }
  }
}

//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
  for (int j=0; j < 256; j++) {     // cycle all 256 colors in the wheel
    for (int q=0; q < 3; q++) {
      for (int i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, Wheel( (i+j) % 255));    //turn every third pixel on
      }
      strip.show();

      delay(wait);

      for (int i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, 0);        //turn every third pixel off
      }
    }
  }
}

// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if(WheelPos < 85) {
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if(WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
2

Your have a mismatch of { and }. Indent your code using tools -> autoformat in the IDE and you will see

  void startShow(int i)
  switch (i)

The first line above should start at the beginning of a line. If it doesn't, your missing a } that closes the previous function (loop(). Your startShow(int i) should also be followed by a {.

You also seem to be missing a } at the end of the code.

Note:
I see that PaulRB also commented on startShow(int i) while I was editing the post to add that.

3 
void startShow(int i)

You need an { at the end of that line.

4

okey, you guys got an input on how l can make different bottons ligth up different coloors on the neopixel matrix?

5

Yeah, we just explained them.

PS. Compared to most computer languages, English is pretty forgiving.

6

okey now each of the 5 bottons cycle the coolors, l want the red botton to light up the leds in red, green botton to make the leds glow green and so on...

any pointers how l can change the code to make this happen?

#include <Adafruit_NeoPixel.h>

void startShow(int i);

// Declare and initialise variable for Neopixel brightness
byte neoBright = 5;

#define BUTTON_PIN1   2

#define BUTTON_PIN2   3

#define BUTTON_PIN3   4

#define BUTTON_PIN4   5

#define BUTTON_PIN5   6

#define PIXEL_PIN    10

#define PIXEL_COUNT 40



Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

bool oldState = HIGH;
int showType = 0;

void setup() {
  pinMode(BUTTON_PIN1, INPUT_PULLUP);
  pinMode(BUTTON_PIN2, INPUT_PULLUP);
  pinMode(BUTTON_PIN3, INPUT_PULLUP);
  pinMode(BUTTON_PIN4, INPUT_PULLUP);
  pinMode(BUTTON_PIN5, INPUT_PULLUP);
  strip.begin();
  strip.setBrightness(neoBright);
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {
  // Get current button state.
  bool newState1 = digitalRead(BUTTON_PIN1);
  bool newState2 = digitalRead(BUTTON_PIN2);
  bool newState3 = digitalRead(BUTTON_PIN3);
  bool newState4 = digitalRead(BUTTON_PIN4);
  bool newState5 = digitalRead(BUTTON_PIN5);

  if (newState1 == LOW && oldState == HIGH) {
    delay(20);
    newState1 = digitalRead(BUTTON_PIN1);
    if (newState1 == LOW) {
      showType++;
      if (showType > 9)
        showType = 0;
      startShow(showType);
    }
  }
  // Set the last button state to the old state.
  oldState = newState1;


  if (newState2 == LOW && oldState == HIGH) {
    delay(20);
    newState2 = digitalRead(BUTTON_PIN2);
    if (newState2 == LOW) {
      showType++;
      if (showType > 9)
        showType = 0;
      startShow(showType);
    }
  }
  // Set the last button state to the old state.
  oldState = newState2;


  if (newState3 == LOW && oldState == HIGH) {
    delay(20);
    newState3 = digitalRead(BUTTON_PIN3);
    if (newState3 == LOW) {
      showType++;
      if (showType > 9)
        showType = 0;
      startShow(showType);
    }
  }
  // Set the last button state to the old state.
  oldState = newState1;

  if (newState4 == LOW && oldState == HIGH) {
    delay(20);
    newState4 = digitalRead(BUTTON_PIN4);
    if (newState4 == LOW) {
      showType++;
      if (showType > 9)
        showType = 0;
      startShow(showType);
    }
  }
  // Set the last button state to the old state.
  oldState = newState4;

  if (newState5 == LOW && oldState == HIGH) {
    delay(20);
    newState5 = digitalRead(BUTTON_PIN5);
    if (newState5 == LOW) {
      showType++;
      if (showType > 9)
        showType = 0;
      startShow(showType);
    }
  }
  // Set the last button state to the old state.
  oldState = newState5;
}
  void startShow(int i) {
    switch (i) {
      case 0: colorWipe(strip.Color(0, 0, 0), 50);    // Black/off
        break;
      case 1: colorWipe(strip.Color(255, 0, 0), 50);  // Red
        break;
      case 2: colorWipe(strip.Color(0, 255, 0), 50);  // Green
        break;
      case 3: colorWipe(strip.Color(0, 0, 255), 50);  // Blue
        break;
      case 4: theaterChase(strip.Color(127, 127, 127), 50); // White
        break;
      case 5: theaterChase(strip.Color(127,   0,   0), 50); // Red
        break;
      case 6: theaterChase(strip.Color(  0,   0, 127), 50); // Blue
        break;
      case 7: rainbow(20);
        break;
      case 8: rainbowCycle(20);
        break;
      case 9: theaterChaseRainbow(50);
        break;
    }
  }

  // Fill the dots one after the other with a color
  void colorWipe(uint32_t c, uint8_t wait) {
    for (uint16_t i = 0; i < strip.numPixels(); i++) {
      strip.setPixelColor(i, c);
      strip.show();
      delay(wait);
    }
  }

  void rainbow(uint8_t wait) {
    uint16_t i, j;

    for (j = 0; j < 256; j++) {
      for (i = 0; i < strip.numPixels(); i++) {
        strip.setPixelColor(i, Wheel((i + j) & 255));
      }
      strip.show();
      delay(wait);
    }
  }

  // Slightly different, this makes the rainbow equally distributed throughout
  void rainbowCycle(uint8_t wait) {
    uint16_t i, j;

    for (j = 0; j < 256 * 5; j++) { // 5 cycles of all colors on wheel
      for (i = 0; i < strip.numPixels(); i++) {
        strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
      }
      strip.show();
      delay(wait);
    }
  }

  //Theatre-style crawling lights.
  void theaterChase(uint32_t c, uint8_t wait) {
    for (int j = 0; j < 10; j++) { //do 10 cycles of chasing
      for (int q = 0; q < 3; q++) {
        for (int i = 0; i < strip.numPixels(); i = i + 3) {
          strip.setPixelColor(i + q, c);  //turn every third pixel on
        }
        strip.show();

        delay(wait);

        for (int i = 0; i < strip.numPixels(); i = i + 3) {
          strip.setPixelColor(i + q, 0);      //turn every third pixel off
        }
      }
    }
  }

  //Theatre-style crawling lights with rainbow effect
  void theaterChaseRainbow(uint8_t wait) {
    for (int j = 0; j < 256; j++) {   // cycle all 256 colors in the wheel
      for (int q = 0; q < 3; q++) {
        for (int i = 0; i < strip.numPixels(); i = i + 3) {
          strip.setPixelColor(i + q, Wheel( (i + j) % 255)); //turn every third pixel on
        }
        strip.show();

        delay(wait);

        for (int i = 0; i < strip.numPixels(); i = i + 3) {
          strip.setPixelColor(i + q, 0);      //turn every third pixel off
        }
      }
    }
  }

  // Input a value 0 to 255 to get a color value.
  // The colours are a transition r - g - b - back to r.
  uint32_t Wheel(byte WheelPos) {
    WheelPos = 255 - WheelPos;
    if (WheelPos < 85) {
      return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
    }
    if (WheelPos < 170) {
      WheelPos -= 85;
      return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
    }
    WheelPos -= 170;
    return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  }