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A Bluetooth remote release for the Mamiya RZ67. A small box on a coin cell plugs into the camera's remote port. An Android or iPhone app fires the shutter, holds it open for bulb, or runs a countdown.
Work in progress. This board is rev B. It fixes the two known faults in rev A, but is not tested yet. For a board that is tested and in use, build the larger ESP32-C3 version at tag
esp32-final: order the files inesp32/pcb/archive/2026-09-07-rev2/, not the rev 3 source. It runs on a LiPo, charges and flashes over USB-C, and works with the same apps.
→ Build guide: parts, ordering the board, printing the case, flashing, the camera cable.
In short:
kicad/out/.case/.| You do | It does |
|---|---|
| Press the button | Wakes and waits 3 minutes for a phone. The LED blinks every 2 s |
| Open the app | Connects on its own. The LED goes dark |
| Leave it | Stays on while the app is connected. With no phone for 3 minutes, it sleeps |
| Hold the button 3 s | Off, until the next press |
For bulb, set the camera's shutter-speed dial to B. The camera closes the shutter by itself
after about 60 seconds.
openrz67-trigger/
├── kicad/ # the board, generated from tools/design.py; fab files in out/
├── case/ # 3D-printed case (build123d), shell + sliding floor + light pipe; STLs in stl/
├── firmware/ # Zephyr application for the nRF54L15
└── docs/
├── build-guide.md
├── protocol.md # camera port and Bluetooth commands
├── perfboard.md # the same circuit on perfboard, off-the-shelf parts
├── support.md # app help
├── privacy.md # app privacy policy
├── render/ # renders docs/img/case-*.png with Blender
└── notes/ # design history and reasoning
Earlier ESP32-C3 versions are at tag
esp32-final.
MIT, covering the firmware, the KiCad design files and the enclosure sources. MIT is written for software, but its grant is broad enough to serve a hardware design; the closest hardware-specific equivalent is CERN-OHL-P.
The footprints, symbols and 3D models in kicad/openrz67-nrf.pretty/,
openrz67-nrf.kicad_sym and openrz67-nrf.3dshapes/ are not covered, because they are
not mine to license. They come from the EasyEDA/LCSC part libraries and are redistributed
here for convenience under their originators' terms.
Not affiliated with Mamiya.
The camera connector pinout that made this project possible was described to me by Julio Ryuuzaki, who built and sold the Bluetooth RZ Blue trigger for years. He answered a cold email in December 2022 with the essentials: four pins, one ground, two live, one unconnected. He also warned that the camera closes the shutter by itself after about a minute in bulb mode. Thank you.
Updated
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