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Galvanically isolated USB-C-to-UART programmer for the ESP8266/ESP32 series. Everything the HC22002 does, plus an isolation barrier for main
The HardCode HC22003 is the galvanically isolated USB-C-to-UART programmer for the ESP8266/ESP32 series. It does everything the non-isolated HC22002 does — USB-to-UART bridging plus automatic reset and boot for esptool, the Arduino IDE and ESP-IDF — and adds an isolation barrier between your PC and the target: a digital isolator on the data lines plus an isolated DC-DC converter on the power rail.
That isolation is what you want for mains-referenced boards, high-voltage front ends, different-ground targets, or any setup prone to ground loops — protecting your laptop and giving clean, reliable flashing where a non-isolated adapter would be risky. Genuinely hard to find: most ESP programmers on the market are non-isolated.
Features
- Galvanic isolation — digital isolator on data + isolated DC-DC on power
- USB-C host interface
- Automatic reset / auto-boot — no boot-button dance
- On-board RST and BOOT buttons
- Works out of the box with esptool, Arduino IDE, and ESP-IDF
- Supports ESP8266, ESP32, ESP32-S2/S3, ESP32-C3
- Selectable pull-up header + jumper cap; clearly labeled isolated breakout
- 4× rubber feet; ships in an ESD bag
What's in the box
- HC22003 isolated programmer board (feet + pull-up header & jumper cap fitted)
- USB-C cable
- 2× connection leads — 1× Dupont 6-pin + 1× 2×3 ribbon
- Quick-start card (QR → online pinout + 3-step flashing guide)
- ESD bag
Don't need isolation?
For ordinary single-ground bench targets, the lower-cost non-isolated HC22002 does the same flashing job.
Need a custom design or Idea of improvement
Contact-us support@hardcode.com.br
Links to code and documentation
Documentation (hardcodebr.github.io)
Shipping policy
shipping within 2 working days.
- 5€ within Europe
- 30€ worldwide
