In this video, I'll show you how to program any Arduino board using the built-in ICSP (In-Circuit Serial Programming) function. This method eliminates the need for an external programmer, making it a simple and efficient way to upload sketches to an Arduino.

You'll need an Arduino board with a built-in USB programmer, such as:

1. Arduino UNO
2. Arduino NANO
3. Arduino MEGA

Step-by-Step Guide

1. Install the Arduino IDE
   • Download Arduino IDE from here
2. Upload the "Arduino as ISP" Sketch to the Programmer
   • Open Arduino IDE
   • Go to File → Examples → ArduinoISP
   • Select your programmer board (e.g., Arduino Nano)
   • Ensure the following settings:
     • Board: Arduino Nano
     • Programmer: AVRISP mkII
   • Click Upload

3. Set Up the Programmer for ICSP
   • Once the sketch is uploaded, change the settings as follows:
     • Board: Select the target board (e.g., Arduino Uno)
     • Programmer: Select "Arduino as ISP"


4. Upload a Sketch to the Target Board
   • Open any sketch you want to upload.
   • Press and hold the Shift key while clicking Upload.
   • This will upload the sketch via the ICSP interface instead of the USB.

Circuit Diagram

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