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Boards like the Arduino Pro Mini skip an onboard USB chip entirely to save cost and space, which means they need an external USB-to-serial adapter like this one for programming and debugging - without it, there is no way to get code onto the board at all. The FT232RL chip fully integrates the USB protocol and clock generation on-chip, so no external crystal or extra support circuitry is needed around it.
Dual voltage selection between 3.3V and 5V covers both logic levels most hobbyist boards use, set via a jumper rather than needing a different adapter per board type. Baud rates from 300 all the way to 3 megabaud cover everything from slow legacy devices to fast modern serial links.
Standard tool for programming boards without onboard USB (Pro Mini and similar), general serial debugging during firmware development, and connecting any TTL-level serial device to a computer.
| Brand | Generic |
|---|---|
| Voltage | 3.3V/5V selectable V |
| Selling unit | PCS |