ChipHeadBang – design for an USB to Serial converter with ICSP header
There are a number of widely used methods to connect microcontroller projects to USB, all of which are not entirely satisfactory:
- The commonly used FTDI chips are somewhat expensive, and their manufacturer has made some unpopular decisions with their driver support (although technically, the FTDI drivers work quite well).
- Atmel also offers microcontrollers with built in USB, but those also tend to be a bit expensive.
- Software USB stacks use a considerable proportion of the microcontroller’s processing power, and as not always as reliable as hardware solutions.
When I therefore heard about a very cheap (40 cents a piece) USB to serial converter IC, the WinChipHead CH340G, I was eager to try it, and bought a few (I bought mine on AliExpress, but they are now also available at Boxtec).