The FTDI module is a USB converter to a TTL serial port (RS232 standard). It is necessary for the programming of development boards (NodeMCU for example) that are not equipped with a built-in Serial / USB converter (CP2102 or CH340).
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![Adafruit FTDI Serial TTL-232 USB Cable [ADA70]](https://images-na.ssl-images-amazon.com/images/I/4151vTNGqPL.jpg)
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