Capacitive Touch Keyboard Business Card

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2024-11-27 14:30:06

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This project was created on 09/12/2024 and last updated a month ago.

Keyboard Business Card - OSHWLab for schematics and PCB project. & RicardoX2X/Business_card (github.com) for the firmware.

Here's the finished schematic. I added a programming header and a wireless antenna.Here's a close look at the antenna and main electronics:

Well, last week after a lot of time spend in research i decide to use the CH32V303 microcontroller from the chinese manufacture WCH, mostly because it's price. but after read after read the documentation and start some PCB routing i discovered that CH32V303 has 4 versions [1}, 3 with 16 TouchKey pins and only one with 10:

And for the surprise of no one the version that i initially choose for this project was the one with only 10 touch capable pins, util there everything was "ok" i only had to pick the version with more pins... but checking the price it turns out the CH32V303RBT6 is at least 50% more expansive than CH32V303CBT6 in quantity: