Documentation

// Blink the onboard LED (connected to D13)
// The classic "Hello World" of microcontrollers

void setup() {
  // Configure pin D13 (LED_BUILTIN) as an output
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // Turn LED on
  delay(1000);                       // Wait 1 second
  digitalWrite(LED_BUILTIN, LOW);    // Turn LED off
  delay(1000);                       // Wait 1 second
}

// Print a counter over USB Serial
// Open Serial Monitor at 9600 baud to see output

unsigned long counter = 0;

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ; // Wait for serial port to connect (needed on some boards)
  }
  Serial.println("Arduino Nano V3.0 ready!");
}

void loop() {
  Serial.print("Counter: ");
  Serial.println(counter);
  counter++;
  delay(500);
}

// Scan the I2C bus and print the addresses of any devices found
// Use SDA=A4, SCL=A5 on the Nano

#include 

void setup() {
  Wire.begin();
  Serial.begin(9600);
  while (!Serial);
  Serial.println("I2C Scanner");
}

void loop() {
  byte error, address;
  int nDevices = 0;

  Serial.println("Scanning...");

  for (address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0) {
      Serial.print("I2C device found at 0x");
      if (address < 16) Serial.print("0");
      Serial.println(address, HEX);
      nDevices++;
    }
  }

  if (nDevices == 0) {
    Serial.println("No I2C devices found");
  } else {
    Serial.print(nDevices);
    Serial.println(" device(s) found");
  }

  delay(5000);
}

// Read an analog value from A0 (e.g., potentiometer, LDR, analog sensor)
// Convert the 10-bit reading (0-1023) to a voltage (0-5V)

const int SENSOR_PIN = A0;

void setup() {
  Serial.begin(9600);
  while (!Serial);
  Serial.println("Analog Read on A0");
}

void loop() {
  int rawValue = analogRead(SENSOR_PIN);
  float voltage = rawValue * (5.0 / 1023.0);

  Serial.print("Raw: ");
  Serial.print(rawValue);
  Serial.print("  Voltage: ");
  Serial.print(voltage, 3);
  Serial.println(" V");

  delay(200);
}

// Fade an LED in and out using PWM
// Connect an LED (with 220 ohm resistor) from D9 to GND
// D9 is one of the PWM-capable pins (marked with ~ on the silkscreen)

const int LED_PIN = 9;
int brightness = 0;
int fadeStep = 5;

void setup() {
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  analogWrite(LED_PIN, brightness);

  brightness += fadeStep;
  if (brightness <= 0 || brightness >= 255) {
    fadeStep = -fadeStep;  // Reverse direction at endpoints
  }

  delay(20);
}