It's a door bell with 48 melodies. It's a reverse engineering project. The initial project was made with 6802 microprocessor!
Project showcase by Harrix
My new created machine to clean glass roofs.
Project tutorial by Gelstronic
Audio 2x3W Modul:
https://fr.aliexpress.com/item/2pcs-Audio-Amplifier-Module-USB-Class-D-Amplifier-Board-2-5-5V-2X3W-for-Arduino/32701394093.html?spm=a2g0s.9042311.0.0.874lYH
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Audio 2x3W Modul:
https://fr.aliexpress.com/item/2pcs-Audio-Amplifier-Module-USB-Class-D-Amplifier-Board-2-5-5V-2X3W-for-Arduino/32701394093.html?spm=a2g0s.9042311.0.0.874lYH