Arduino_to_led_code.ino

#include <SPI.h>
#include <DMD2.h>
#include <fonts/Arial_Black_16.h> //include the library of the fonts used on the LED display
#include <string.h>

//starts LED display with 3 columns and 1 line of matrix (1x1 matrix = 16x16 LEDs)
SoftDMD dmd(3,1);
DMD_TextBox box(dmd);

String save=""; //starts a string responsible to save the data

void setup() {
  //set the brightness of the LED display
  dmd.setBrightness(30);
  //set the font used on the LED display
  dmd.selectFont(Arial_Black_16);
  dmd.begin();
//set the data rate in bits per second for serial data transmission
  Serial.begin(4800);
}
void loop(){
  //if there's something on Serial
  if(Serial.available()>0){
    //reset save
    save="   PV SYSTEM         VOLTAGE: ";
    //while there's something on Serial
    while(Serial.available())
      //reads string and saves it
      save+=(char)Serial.read();
  }
  //print each letter of 'save' on LED display
  for(int i=0;i<save.length();i++){
    box.print(save[i]);
    //pause for 0.3 second
    delay(300);
  }
}