SDG #193 An FTDI FT4232H adaptor for ESP32 programming and more! Neon - alicjamusial

The Neon board is an open-source USB interface adaptor built around the FTDI FT4232H, a quad-channel high-speed USB bridge that can present four independent serial or MPSSE ports at once. That combination makes it far more flexible than the usual single-channel CH340 or CP2102 dongles: one channel can drive UART for ESP32 flashing and console output, while others handle JTAG, SPI, I2C or GPIO duties. For anyone debugging microcontrollers, FPGAs or SPI flash, having several protocols available from a single USB cable removes a lot of desk clutter and cable swapping.

This build walks through the practical side of turning a published design into working hardware. The project repository and hardware files are reviewed first, along with the PCB fabrication choices and what the board revision contains, before moving into assembly. The FT4232H itself is the interesting part of the soldering job, being a fine-pitch QFP that benefits from paste, flux and hot air rather than iron-only work, and the video shows the technique used on the passives and connectors as well.

Testing covers whether the board enumerates correctly and whether the channels behave as expected once plugged in, which is the real test of an FTDI design given how sensitive these chips are to solder bridges on the data lines and crystal circuitry.

The takeaway for viewers: if you regularly program ESP32 modules or need low-cost JTAG and multi-protocol access, a self-built FT4232H adaptor is a genuinely useful bench tool, though it demands reasonable SMT skills and a genuine FTDI part to avoid driver headaches.