Hardware compatible with CNLohr's ESP32-S2 ch32v003 programmer:
https://github.com/cnlohr/cnhardware/tree/master/esp32s2-funprog
Firmware and flashing instructions availble here:
https://github.com/cnlohr/esp32s2-cookbook/tree/master/ch32v003programmer
Differences:
- 500mA polyfuse on the VBUS rail
- USB protection IC
- Current limited power switches
- 5V and 3.3V present led indicators
- smaller footprint, fits into the "USB dongle" acrylic enclosure (same as original WCHLinkE)
- U.FL connector for external WiFI antenna
PCB is 4 layer, designed using KiCAD7. Gerbers in ZIP file are included as well as HTML BOM.
Pictures below show rev A, which had additional target discharge option. It was not necessary since the BL2555 power switches have that feature built in.
PCB is designed to fit into one of those transparent "USB" enclosures, the same the original WCHLinkE programmer is using.
(c) 06.2023 by Piotr Zapart
www.hexefx.com