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USB to UART adapter - 2016

This adapter was made to replace and upgrade a previous one. CH340 chip was desoldered from an Arduino board and placed on a hand-drawn PCB.

USB to UART

Assembled over a weekend, with some build-in LEDs for visualising the data transfer.

USB to UART

Schematics is below:

USB to UART schematics

The previous adapter I used was a copy of a cdc232 project with Attiny2313 and maximum baudrate 38400. The slow speed combined with no data transfer visualization eventually proofed inadequate, hence the upgrade.

CDC232