He used the same connection scheme, but went with an edge connector for the USB instead of using a mini-B jack. It’s pretty impressive to see his prototyping work with the 16-pin QFN package.

Simple USB to TTL example for KB2040. Useful for debugging a KB2040 with another KB2040 when using one as USB host device. Wire up RX->RX, TX->TX, and GND->GND between two KB2040s. Compile and upload ...

Driver module in use: ch341 1a86:7523 QinHeng Electronics CH340 serial converter Problem is, I get a timeout when trying to connect. I ran pai-service as root to make sure it has proper access to /dev ...

When we need to go small, we use a Pro Trinket 3V or 5V, but if you want to have USB-to-Serial built in, we reach for an Adafruit METRO Mini.” Source: Adafruit ...