Arduino isolated programmer

Programmer hardware for Arduino provides galvanic isolation between computer and Arduino device. Prevents ground loop disturbances too. Clean strong Rx Tx DTR signals, tested from 110 to 2,000,000 Baud. Isolated supply built in: 5V or 3.3V 270 mA.

Useful when the device to be programmed is on a different potential from the computer on which the IDE runs. It could protect your laptop from damages via ground loops or kickback from high power devices as well.

Built around the ADUM-1201 chip, and opto isolator for the DTR (reset).
Power is provided by B0505S-1W module, selectable 5 or 3.3V voltages.

Serial converter : CH340G micro USB module, is available in different formats. The 3D print file covers two models depending on the positioning of the USB.

Other than CH340G (CH340E, CP2102) should work but not tested. CH340E modules for example have no DTR signal, the RTS signal is called DTR on the PCB.

Do not rely on the Rx Tx etc. printed text on the "USB to Serial" mod