An interactive toy that changes the pitch of the user's voice and streams it over Bluetooth A2DP

When I was little I had this parrot toy which repeated my words with a funny voice. I have great memories playing with this toy and I have decied to create a similar one for my kids.

The project uses M5Stack Core2, LVGL 9 for UI, arduino-audio-tools for sound processing and ESP32 A2DP for streaming.

Currently the name of the speaker is hardcoded in the audio.h file - #define SPEAKER_NAME "ACTON II" Once the device boots, press the pair button on the Bluetooth speaker and the

The character images were created using Photoshop and exported as transparent PNG. After that using the LVGL 9 image convertor tool, the PNGs were converted to a C Array with RGB565A8 color format to maintain their rounded corners.

The voice is changed by manipulating the pitch of the sound input using the PitchShift class of arduino-audio-tools. The pitch is adjustable using the pitchShifter.setValue() method. Pitch above 1.0 generates a Mickey Mouse-like voice and pitch below 1.0 generates a Hulk-like vocie.

• The allocation of resources needs a bit more fine tuning because there is a sligthly audiable buffer underflow in the output sound.
• Currently, name of the Blueooth receiver is hardcoded. It would be a good idea to implement a GUI for searching and selecting the desired Blueooth receiver.
• Add a battery indicator.

• LVGL
• Arduino-Audio-Tools
• ESP32 A2DP