Nano Board tester

/*********************************************************************
Learnelectronics
Arduino Nano Experimentor's Board Test Script
July 14,2020
https://www.youtube.com/learnelectronics
email: [email protected]
*********************************************************************/

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2


#define LOGO16_GLCD_HEIGHT 16
#define LOGO16_GLCD_WIDTH  16
static const unsigned char PROGMEM logo16_glcd_bmp[] =
{ B00000000, B11000000,
  B00000001, B11000000,
  B00000001, B11000000,
  B00000011, B11100000,
  B11110011, B11100000,
  B11111110, B11111000,
  B01111110, B11111111,
  B00110011, B10011111,
  B00011111, B11111100,
  B00001101, B01110000,
  B00011011, B10100000,
  B00111111, B11100000,
  B00111111, B11110000,
  B01111100, B11110000,
  B01110000, B01110000,
  B00000000, B00110000 };

#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

void setup()   {
  Serial.begin(9600);

  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3D (for the 128x64)
  // init done

  // Show image buffer on the display hardware.
  // Since the buffer is intialized with an Adafruit splashscreen
  // internally, this will display the splashscreen.
  display.display();
  delay(2000);

  // Clear the buffer.
  display.clearDisplay();

  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(9,OUTPUT);

  pinMode(4,INPUT);
  pinMode(7,INPUT);
  pinMode(8,INPUT);

  digitalWrite(5,LOW);
  digitalWrite(6,LOW);
  digitalWrite(9,LOW);


}

void loop() {

display.clearDisplay();
display.setCursor(0,0);
display.setTextSize(2);
display.setTextColor(WHITE);
display.print("hola");
display.display();

Serial.print(digitalRead(4));


if (digitalRead(4)==0){
  digitalWrite(5,HIGH);
  delay(10);
}
else{
  digitalWrite(5,LOW);
}

if (digitalRead(7)==0){
  display.clearDisplay();
display.setCursor(0,0);
display.setTextSize(2);
display.setTextColor(WHITE);
display.print("D7 is low");
display.display();
delay(500);
}

if (digitalRead(8)==0){

  digitalWrite(6,HIGH);
  delay(50);
  digitalWrite(6,LOW);
  digitalWrite(9,HIGH);
  delay(50);
  digitalWrite(9,LOW);

  digitalWrite(6,HIGH);
  delay(50);
  digitalWrite(6,LOW);
  digitalWrite(9,HIGH);
  delay(50);
  digitalWrite(9,LOW);

  digitalWrite(6,HIGH);
  delay(50);
  digitalWrite(6,LOW);
  digitalWrite(9,HIGH);
  delay(50);
  digitalWrite(9,LOW);
  digitalWrite(6,HIGH);
  delay(50);
  digitalWrite(6,LOW);
  digitalWrite(9,HIGH);
  delay(50);
  digitalWrite(9,LOW);
  digitalWrite(6,HIGH);
  delay(50);
  digitalWrite(6,LOW);
  digitalWrite(9,HIGH);
  delay(50);
  digitalWrite(9,LOW);
  digitalWrite(6,HIGH);
  delay(50);
  digitalWrite(6,LOW);
  digitalWrite(9,HIGH);
  delay(50);
  digitalWrite(9,LOW);
}
else{
  digitalWrite(5,LOW);
}


}