Arduino Nano Basics: Getting Started with Microcontroller Projects

Arduino Nano is a popular microcontroller board among electronics and programming learners. Its compact size, affordable price, and ease of use make it an excellent starting point. This article covers basic circuit connections and your first Arduino Nano sketch.

What Does Arduino Nano Look Like?

The Arduino Nano has 14 digital pins (0-13) and 8 analog pins (A0-A7). It also includes power pins for 5V and 3.3V output, plus ground pins.

How to Wire a Blink LED Circuit

The classic first project is the blinking LED, which serves as a great basic test.

[image: LED circuit wiring diagram connecting LED to pin D13 with 220Ω resistor on Arduino Nano]

Required Components

• Arduino Nano board
• 1 LED
• 220Ω Resistor (current limiting)
• Jumper wires
• Breadboard

Wiring Steps

1. Connect the 220Ω resistor to Arduino Nano pin D13
2. Connect the LED anode (long leg, +) to the other end of the resistor
3. Connect the LED cathode (short leg, -) to Arduino Nano GND pin

Arduino Code for Blink LED

// Define LED pin
const int LED_PIN = 13;

void setup() {
  // Set LED pin as OUTPUT
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // Turn LED ON (HIGH = 5V)
  digitalWrite(LED_PIN, HIGH);
  
  // Wait 1 second (1000 ms)
  delay(1000);
  
  // Turn LED OFF (LOW = 0V)
  digitalWrite(LED_PIN, LOW);
  
  // Wait 1 second
  delay(1000);
}

How to Upload Code to Arduino Nano

1. Open Arduino IDE
2. Go to Tools > Board > Arduino Nano
3. Go to Tools > Processor > ATMega328P (Old Bootloader) for clones
4. Select the correct Port
5. Click Upload button

[image: Arduino IDE screenshot showing Board and Port selection for Arduino Nano]

Common Problems and Solutions

Upload Failed

If you encounter “avrdude: stk500_recv() programmer is not responding” error, try:

• Verify correct Port selection
• Change Processor to “ATMega328P (Old Bootloader)”
• Hold the Reset button on the board before clicking Upload, then release when you see “Uploading…”

Installing CH340 Drivers

Most Arduino Nano clones use CH340 USB-to-Serial chip. You must install CH340 drivers before the board will be recognized.

Safety Precautions

• Never apply more than 5V to the 5V pin
• Connect LED with correct polarity - long leg is anode (+)
• Disconnect external power sources before powering via USB

Summary

Arduino Nano is an excellent starting point for learning microcontrollers. Its compact size and affordable price make it suitable for various DIY projects. Start with the blinking LED circuit and gradually increase complexity as you progress.