[Modified] 6-key small keyboard - made using Qinheng CH552G microcontroller

I have made a few modifications to the original project, optimizing the layout, adding axis seat hot-swapping, etc. However, there is a problem with the program of the original project. Adding a pull-down resistor still cannot solve the disconnection problem, so it is not recommended to use it (I don’t know how to write software... …)

Can anyone help me change the original author's program?

This is the finished product

Gerber is included in the attachment, you can just print the board directly

cost

I use the jlc board (free)

The total of various electronic components does not exceed 5 yuan (all with free shipping)

For shafts, you can buy Gaote's tb. The lowest price is a few cents, and you can buy 10 pieces with free shipping (that store later increased the price, and now it costs at least 1.5 yuan...)

shell

I can't wait to be offline. I'll take the time to draw one.

(I spent a day doing 3D printing of the shell of another USBhub project that was not open source, and I was already feeling bad)

Attached:

If you have already done it, you can burn this project.

https://www.oshwhub.com/TheLight/zi-ding-yi-jian-pan

The ec16 hex file attached to the later project can use at least 4 keys and does not drop the connection.