Ricardo Daniel de Paula
Here's a close look at the antenna and main electronics:
And here's (probably) the finished result::
Finishing touches, Wireless and more.
A project log for Capacitive Touch Keyboard Business Card
A PCB business card that are a usb-c touch keyboard
A project log for Capacitive Touch Keyboard Business Card
A PCB business card that are a usb-c touch keyboard
And here's (probably) the finished result::
Discussions
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These chips are programmable over USB right? You could omit the programming header then, although having it doesn't look bad at all.
I think you can even omit the 32k crystal, run on the internal clk?
Are you sure? yes | no
The ideia is not solder the header on it, so it doesn't add cost at all, but i will probably need it to real time debbug the firmware, so i added it anyway.
About the crystal, i read that the Bluetooth doesn't work great with the internal oscillator.
Are you sure? yes | no
Yeah I figured something like that indeed. About the crystal, I did not know that! I have some ch592 devboards I can run a few tests on if you are interested? (I will probably do this for another project I have somewhere along the way, but that will take a few months more)
Are you sure? yes | no