Keyboard Business Card

The project aims to combine a business card with a functional USB-C capacitive touch keyboard on a PCB. The initial idea focused on using microcontrollers like the RP2040, Atmega32u, and STM32F103, but these lacked native capacitive touch functionality. After further research, the CH32V303 was selected due to its built-in USB 2.0 and 16 capacitive touch channels, capable of supporting up to 48 keys through multiplexing. However, to reduce costs, the project later switched to the CH582M, which also has capacitive touch capabilities, USB support, and even includes Bluetooth functionality, potentially allowing wireless communication.

The goal is to keep the design as affordable as possible while ensuring it remains a unique, functional business card. The final device would serve as a 40% keyboard and be a demonstration of both electronic engineering skills and the practical use of capacitive touch technology.

Capacitive Touch Keyboard Business Card | Hackaday.io for project Logs
&
RicardoX2X/Business_card (github.com) for the firmware.

Project Overview Video:

PCB Cartão de Visita & Teclado Touch - Visão Global do Projeto #pcbway (youtube.com)