diff --git a/1209/C552/index.md b/1209/C552/index.md
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+---
+layout: pid
+title: CH552 USB Foot Pedal
+owner: zjm54321
+license: GPL-3.0-or-later (firmware), CERN-OHL-S-2.0 (hardware)
+site: https://github.com/zjm54321/ch552-pedal
+source: https://github.com/zjm54321/ch552-pedal
+---
+Single-switch USB foot pedal based on the WCH CH552G (8051) microcontroller.
+It enumerates as a standard USB HID keyboard plus a VIA-compatible Raw HID
+interface (usage page 0xFF60) for browser-based remapping of plain keys and
+modifier chords; mappings persist in the chip's DataFlash. Each unit reports a
+USB serial number derived from the chip's unique ID so that multiple pedals can
+be connected and configured independently. Firmware is written in C for SDCC,
+reusing the CH55xduino USB stack; the PCB is designed in KiCad.
diff --git a/org/zjm54321/index.md b/org/zjm54321/index.md
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+---
+layout: org
+title: zjm54321
+site: https://github.com/zjm54321
+---
+Individual maker building small open-source USB input devices.