ravigupta

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

• pixel led – https://amzn.to/3dJe0s4
• Arduino UNO – https://amzn.to/2WDwGEh
• SMPS – https://amzn.to/2zIjuEM
• HCO5 Bluetooth – https://amzn.to/3fFo9HO

Wiring

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