# Programming Raspberry Pi Pico with Arduino IDE (Pico W Compatible)

Learn how to program the **Raspberry Pi Pico** and **Pico W** using the **Arduino IDE**. The Raspberry Pi Pico is a low-cost microcontroller board built around the RP2040 chip by the Raspberry Pi Foundation. In this guide, you’ll learn how to set up Arduino IDE and begin programming the Raspberry Pi Pico with C/C++.

***

## Step 1: Adding the Raspberry Pi Pico to the Boards Manager

1. **Open Arduino IDE**.
2. Go to **File > Preferences**.
3. In the **"Additional Boards Manager URLs"** field, enter the following URL:

   ```
   https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
   ```
4. Click **OK**.
5. Now, go to **Tools > Board > Boards Manager…**
6. Search for **"pico"** and install the **Raspberry Pi Pico/RP2040** boards package.
7. Once installed, go to **Tools > Board**, and you'll see a selection of **Raspberry Pi Pico** boards.

***

## Step 2: Selecting Your Pico Board

1. Go to **Tools > Board** and select the **Raspberry Pi Pico** or **Pico W** model that you are using.

***

## Step 3: Loading the Blink LED Sketch

1. Go to **File > Examples > 1. Basic > Blink**.
2. The **Blink** sketch should load, which turns an LED on and off every second.
3. You can also copy the code below:

   ```cpp
   /*
     Blink - Turns an LED on for one second, then off for one second repeatedly.
     This example code is in the public domain.
   */

   // Setup function runs once when you press reset or power the board
   void setup() {
     pinMode(LED_BUILTIN, OUTPUT);  // Initialize digital pin LED_BUILTIN as an output
   }

   // Loop function runs repeatedly
   void loop() {
     digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED on
     delay(1000);                      // Wait for a second
     digitalWrite(LED_BUILTIN, LOW);   // Turn the LED off
     delay(1000);                      // Wait for a second
   }
   ```

***

## Step 4: Connecting the Raspberry Pi Pico in BOOTLOADER Mode

1. **Put the Pico in Bootloader Mode**:

   If your Raspberry Pi Pico is currently running **MicroPython** or is new, you need to manually put it into bootloader mode.

   * Press and hold the **BOOTSEL** button on the Pico while connecting it to your computer via USB.
   * A new mass storage device will appear on your computer. You can ignore this window and close it.
2. **Upload the Code**:

   For future uploads using the Arduino IDE, the Pico board will automatically enter bootloader mode without pressing the **BOOTSEL** button.
3. In Arduino IDE, open the **Tools > Port** menu, then select **Select Other Board and Port...**.
4. **Select the Pico**: Choose **Raspberry Pi Pico** or **Raspberry Pi Pico W** as the board, and select the appropriate COM port.
5. Tick **Show All Ports** if the COM port doesn’t show up, and select **UF2 Devices** as the port option.

***

## Step 5: Upload the Code

1. After selecting the correct board and port, click on the **Upload** button in the Arduino IDE.
2. Once the code is uploaded, you should receive a success message.

***

## Step 6: Demonstration

1. If everything went as expected, the **onboard LED** of the Raspberry Pi Pico should now be blinking every second.

***


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