念慈菴

The smallest board for 4pin programming! The most beggars version ch340c

Overview

As you can see, this flashing folder is really small ! It is only as big as two Type-cs, 1.7cm*1.1cm .
Although the space was extremely compressed, I still used the ch340c instead of the ch340e, because the ch340c can be bought at a regular price of 1 yuan , so I don’t have to go to other merchants, and it’s not easy to buy electronic components from merchants.
Type-c uses a long pad , which is easier to solder.
It’s more fun to use a burning clip. I used Taobao. The principle is not difficult. It only requires a few pieces of acrylic, a screw and a spring, which costs 22+8 in total (postage). It’s more expensive because fewer people buy it, and you’ll save a lot if you DIY it .
As for why the original burning parts are external:
①Except for development, the number of times burning is rarely used, the burning part is very redundant, and each board only increases the cost and takes up space .
②For people who like dense boards (like me), it is difficult to find a small and cheap programming module. When choosing the huge sop16 package of ch340c, the overall layout is simply torture for me. The burning module is external, optimizing the layout and routing, reducing the density of the original components and enhancing the reliability of the original components.
③How can the test site not have high-end things? www

Design Files

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Update:2025-05-08 12:44:35

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