My Arduino Software Collection

get_i2C_address.ino

#include <Wire.h>

void setup()
{
    Wire.begin();
    Serial.begin(115200);
    Serial.println("\nI2C Scanner");
}

void loop()
{
    byte error, address;
    int nDevices;
    Serial.println("Scanning...");
    nDevices = 0;
    for (address = 1; address < 127; address++)
    {
        Wire.beginTransmission(address);
        error = Wire.endTransmission();
        if (error == 0)
        {
            Serial.print("I2C device found at address 0x");
            if (address < 16)
            {
                Serial.print("0");
            }
            Serial.println(address, HEX);
            nDevices++;
        }
        else if (error == 4)
        {
            Serial.print("Unknow error at address 0x");
            if (address < 16)
            {
                Serial.print("0");
            }
            Serial.println(address, HEX);
        }
    }
    if (nDevices == 0)
    {
        Serial.println("No I2C devices found\n");
    }
    else
    {
        Serial.println("done\n");
    }
    delay(5000);
}

i2C_character_display_hello_world.ino

#include <LiquidCrystal_I2C.h>
#include <Wire.h>

// set the LCD number of columns and rows
int lcdColumns = 20;
int lcdRows = 4;

// set LCD address, number of columns and rows
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

void setup()
{
    // initialize LCD
    lcd.init();
    // turn on LCD backlight
    lcd.backlight();

    Wire.begin();
    Serial.begin(115200);
    Serial.println("\nI2C Scanner");
}

void loop()
{
    char test[] = "Hello, World!";

    int col = 4;
    // set cursor to a variable column, first row
    lcd.setCursor(col, 0);
    // print message
    lcd.print(test);
    delay(1000);
    // clears the display to print new message
    lcd.clear();

    lcd.setCursor(col, 1);
    lcd.print(test);
    delay(1000);
    lcd.clear();

    lcd.setCursor(col, 2);
    lcd.print(test);
    delay(1000);
    lcd.clear();

    lcd.setCursor(col, 3);
    lcd.print(test);
    delay(1000);
    lcd.clear();

    int counter = char_counter(test);
    Serial.println(counter);
    lcd.setCursor(5, 1);
    lcd.print("Line count");
    delay(1000);

    lcd.setCursor(7, 2);
    lcd.print("is");
    delay(1000);

    lcd.setCursor(11, 2);
    lcd.print(String(counter));
    delay(1000);
    lcd.clear();
}

int char_counter(char *character_arr)
{
    int char_length = strlen(character_arr);
    return char_length;
}

i2C_oled_hello_world.ino

/* Hello World OLED Test */
#include "SSD1306.h"         // alias for `#include "SSD1306Wire.h"`
SSD1306 display(0x3c, 5, 4); // Initialise the OLED display using Wire library
void setup()
{
    Serial.begin(115200);
    display.init(); // Initialising the UI will init the display too.
    display.flipScreenVertically();

    display.clear();
}
void loop()
{
    drawHelloWorld();
    display.display();
    display.clear();
    delay(2000);
    display.display();
    delay(3000);
}
void drawHelloWorld()
{
    char i[]{"Hello, world!"};
    display.setTextAlignment(TEXT_ALIGN_LEFT);
    display.setFont(ArialMT_Plain_10);
    display.drawString(0, 0, i);
    display.setFont(ArialMT_Plain_16);
    display.drawString(0, 10, i);
    display.setFont(ArialMT_Plain_24);
    display.drawString(0, 26, i);
}

light_switch.ino

const int led = 5;
const int button = 16;
int temp = 0;

void setup()
{
    Serial.begin(9600);
    pinMode(led, OUTPUT);
    pinMode(button, INPUT);
    digitalWrite(led, LOW);
}

void loop()
{
    temp = digitalRead(button);

    if (temp == HIGH)
    {
        digitalWrite(led, HIGH);
        Serial.println("LED Turned ON");
        delay(200);
    }
    else
    {
        digitalWrite(led, LOW);
        Serial.println("LED Turned OFF");
        delay(200);
    }
}