A CH340 based USB to serial
TTL adapter. This module makes use of the common CH340 USB interface IC to
provide a low cost alternative to the FTDI adapter. It also has the additional
feature of being able to select 3.3V*/5V TTL levels by linking the VCC pin to
either the 3.3V pin or 5V pin using the supplied jumper.
Note: This module is not suitable for use with ESP modules.
Pinnout:
1….5V (USB)
2….VCC (Input, connect to 5V or 3V3 pin via jumper)
3….3V3 (*measured at 3.67V)
4….TXD
5….RXD
6….GND
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