How to make pixel led wireless display


hello friends welcome to my blog in this blog we learn about how to make pixel led wireless display using the android app

Parts required

  • I used the following parts in this project

Wiring

How to make pixel led wireless display
arduino-with-bluetooth-and-pixel

Android app

download app – https://bit.ly/32khLlw

download Arduino library – https://drive.google.com/file/d/1VK1yg1hpBcTI9zC48Yir4lYii5kidkNu/view?usp=sharing

Code for How to make pixel led wireless display

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#include <SoftwareSerial.h>
#include <EEPROM.h>

#define PIN 6
#define EEPROM_MIN_ADDR 0
#define EEPROM_MAX_ADDR 100
#define LEN 450

const String defaultText = " Electronics Ravi ";
// temp variable for storing the displayed text
String in = defaultText;

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(25, 8, PIN,
  NEO_MATRIX_TOP     + NEO_MATRIX_LEFT +
  NEO_MATRIX_COLUMNS + NEO_MATRIX_ZIGZAG,
  NEO_GRB            + NEO_KHZ800);

SoftwareSerial BTserial(0,1); // RX | TX
const uint16_t colors[] = {
  matrix.Color(255, 0, 0),
  matrix.Color(0, 255, 0),
  matrix.Color(255, 255, 0),
  matrix.Color(0, 0, 255), 
  matrix.Color(255, 0, 255),
  matrix.Color(0, 255, 255)};

void setup() {
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(255);
  matrix.setTextColor(colors[0]);
  randomSeed(analogRead(0));
  BTserial.begin(9600);
  //Serial.begin(9600);
  
  char chararray[LEN];
  if(eeprom_read_string(10, chararray, LEN)) {
    //Serial.println(chararray);
    in = chararray;
  }  
}

void loop() {
  if(BTserial.available() > 0){
    in = BTserial.readString();
    char temparray[in.length()+1];
    in.toCharArray(temparray, in.length()+1);
    if(strstr(temparray, "new") != NULL){
      in = strstr(temparray, "new")+3;
      char temp[in.length()+1];
      in.toCharArray(temp, in.length()+1);
      eeprom_write_string(10, temp);
    }
    else{
      in = defaultText;
      char temp[in.length()+1];
      in.toCharArray(temp, in.length()+1);
      eeprom_write_string(10, temp);
    }
  }
 
  text(random(6));
  
}



void text(int colorbegin){
  int x    = matrix.width();
  int pass = 0;
  while( pass < 3){
    matrix.fillScreen(0);
    matrix.setCursor(x, 0);
    int len = in.length();
    matrix.print(in);
    if(--x < -len*6) {
      x = matrix.width();
      pass++;
      matrix.setTextColor(colors[(colorbegin+pass)%6]);
    }
    matrix.show();
    delay(80);
  }
}

// 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 matrix.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if(WheelPos < 170) {
    WheelPos -= 85;
    return matrix.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return matrix.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}


//Write a sequence of bytes starting at the specified address.
//Returns True if the entire array has been written,
//Returns False if start or end address is not between the minimum and maximum allowed range.
//If False was returned, nothing was written 
boolean eeprom_write_bytes(int startAddr, const byte* array, int numBytes) {
  int i;
 
  if (!eeprom_is_addr_ok(startAddr) || !eeprom_is_addr_ok(startAddr + numBytes)) return false;
 
  for (i = 0; i < numBytes; i++) {
    EEPROM.write(startAddr + i, array[i]);
  }  return true;
}
 
//Writes an int value to the specified address. 
boolean eeprom_write_int(int addr, int value) {
  byte *ptr;
 
  ptr = (byte*)&value;
  return eeprom_write_bytes(addr, ptr, sizeof(value));
}
 
//Reads an integer value at the specified address
boolean eeprom_read_int(int addr, int* value) {
  return eeprom_read_bytes(addr, (byte*)value, sizeof(int));
}
 


//Reads the specified number of bytes at the specified address
boolean eeprom_read_bytes(int startAddr, byte array[], int numBytes) {
  int i;
 
  if (!eeprom_is_addr_ok(startAddr) || !eeprom_is_addr_ok(startAddr + numBytes)) return false;
 
  for (i = 0; i < numBytes; i++) {
    array[i] = EEPROM.read(startAddr + i);
  } return true;
}
 
//Returns True if the specified address is between the minimum and the maximum allowed range.
//Invoked by other superordinate functions to avoid errors.
boolean eeprom_is_addr_ok(int addr) {
  return ((addr >= EEPROM_MIN_ADDR) && (addr <= EEPROM_MAX_ADDR));
}
 
//Write a string, starting at the specified address
boolean eeprom_write_string(int addr, const char* string) {
  int numBytes;
  numBytes = strlen(string) + 1;
 
  return eeprom_write_bytes(addr, (const byte*)string, numBytes);
}
 
//Reads a string from the specified address
boolean eeprom_read_string(int addr, char* buffer, int bufSize) {
  byte ch;
  int bytesRead;
 
  if (!eeprom_is_addr_ok(addr)) return false;
  if (bufSize == 0) return false;
 
  if (bufSize == 1) {
    buffer[0] = 0;
    return true;
  }
 
  bytesRead = 0;
  ch = EEPROM.read(addr + bytesRead);
  buffer[bytesRead] = ch;
  bytesRead++;
 
  while ((ch != 0x00) && (bytesRead < bufSize) && ((addr + bytesRead) <= EEPROM_MAX_ADDR)) {
    ch = EEPROM.read(addr + bytesRead);
    buffer[bytesRead] = ch;
    bytesRead++;
  }
 
  if ((ch != 0x00) && (bytesRead >= 1)) buffer[bytesRead - 1] = 0;
 
  return true;
}

video tutorial for How to make pixel led wireless display

6 thoughts on “How to make pixel led wireless display”

  1. You are so awesome! I do not think I’ve read through anything like this before.

    So nice to find another person with unique thoughts on this subject matter.
    Really.. thanks for starting this up. This website is one thing that is required on the web, someone with some originality!

    Reply

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