Loudspeaker

Besides the buzzer, we still have a loud speker as sound device, which is directly controlled by the Raspberry Pi Pico. However, please note that its sound quality is not so good. If you want better sound quality, you can connect audio conveter module to spare GPIO pins for extended use.

In this project, we use the speaker to play a piect of music. If you just use the speaker to make simple sounds, you can refer to the example of the buzzer and modify the pins accordingly.

Add libraries

Method 1

Open Arduino IDE, click Sketch on Menu bar -> Include Library -> Manage Libraries.

Here need to install following Libraries;

ESP8266Audio

LittleFS_MBed_RP2040

Install the PicoLittleFS tool

The latest Arduino IDE has supported LittleFS plugins. The steps to install PicoLittleFS is as follows:

Copy the file arduino-littlefs-upload-1.0.0.vsix to the computer’s directory ~/.arduinoIDE/plugins/

Eg:  C:\Users\Senadhi\Documents\Arduino\plugins

here Senadhi is the user name, which can be different for each user

Link: https://drive.google.com/file/d/1em4GDpf_cDJQyki_lvvB9VZBHBzF0TBO/view?usp=drive_link

If there is no a folder name plugins in your computer, please create the folder before copying the file. After copying the file, restart Arduino IDE

To enable LittleFS data upload for your Raspberry Pi Pico in Arduino IDE 1.8.9, you need to install the appropriate plugin and then follow a specific procedure to upload your data.

1. Install the LittleFS Uploader Plugin:

The standard LittleFS Uploader plugin for Arduino IDE 1.x is typically designed for ESP8266, but a compatible version for Raspberry Pi Pico exists.

• Download the plugin: Locate and download the arduino-littlefs-upload plugin for Arduino IDE 1.x. You can often find this on GitHub repositories maintained by the Raspberry Pi Pico Arduino core developers. The file will likely be a .jar file.

• Install the plugin:

  • Navigate to your Arduino IDE's tools folder. This is usually located within your Arduino installation directory (e.g., C:\Program Files (x86)\Arduino\tools on Windows).

  • Create a new folder named ESP8266LittleFS (or a similar name if specified by the plugin instructions).

  • Inside this new folder, create another folder named tool.

  • Place the downloaded .jar file into this tool folder.

• Restart Arduino IDE: Close and reopen your Arduino IDE to allow it to recognize the new plugin.

2. Prepare your Sketch and Data:

• Create or open a sketch: Open an existing Arduino sketch or create a new one and save it.

• Create the data folder:

  • Go to Sketch > Show Sketch Folder in the Arduino IDE menu. This will open the directory where your sketch is saved.

  • Inside this sketch folder, create a new folder named data.

• Place your files: Put all the files you want to upload to the LittleFS filesystem into this newly created data folder. 

• 
  

3. Upload the Data:

• Select your board and port:
  Ensure you have the correct "Raspberry Pi Pico" board selected under Tools > Board and the correct COM port selected under Tools > Port.

• Close Serial Monitor:
  Make sure the Serial Monitor is closed, as it can interfere with the upload process.

• Upload the data:
  Go to Tools > ESP8266 LittleFS Data Upload (or a similar option name if the plugin uses a different label for Pico).

• Monitor the upload:
  The IDE's status bar will indicate the progress and completion of the upload.

After the upload is complete, your Raspberry Pi Pico's LittleFS filesystem will contain the files you placed in the data folder. You can then access these files within your sketch using the LittleFS library.