Brufik

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Hardware in this repository is under CERN-OHL-S-2.0; software is under GPL-3.0.

Brufik is an open-source deskbot on Seeed XIAO ESP32S3 Sense. Backend: open-deskbot-service.

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1. Out of the box

1. Set your router or phone hotspot to deskbot_wifi / hello2026 (defaults in firmware/deskbot_config.h).
2. Power on — the device joins that WiFi and talks to your backend.
3. To use another SSID: edit WIFI_DEFAULT_* and DESKBOT_WS_* before flash, or join AP Deskbot_Rom → http://192.168.4.1/.

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2. Developers

Edit firmware/deskbot_config.h, then:

./flash_rom.sh all

Deploy open-deskbot-service. Firmware WebSocket: /asr_chat.

Optional debug: http://<device-ip>/ for a local camera page.

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3. DIY assembly

Part	Notes	Search terms
MCU	Camera module + onboard mic on the Sense board (no extra purchase)	Seeed XIAO ESP32S3 Sense
Lens	For OV2640; 120° wide angle; same-plane (not off-axis); 25 mm length	OV2640 lens 120° same plane 25mm
LCD	1.83" SPI ST7789 240×284	Waveshare 1.83 LCD Rev2
Servos	Large + small; pan = 2g micro servo, tilt = larger servo	2g servo, SG90 / 9g servo
Amp	I2S	MAX98357A
Speaker	2011 type	2011 speaker, 8Ω 2011
Power	5V ≥1A for servos	—
PCB	This repo includes an extension PCB for easier wiring; hand-wiring without the PCB also works	—

Assembly guide & reference photos

• Step-by-step manual: mechanical/说明书1.02PDF.pdf
• All parts laid out: mechanical/parts-overview.png
• Core assembly done (shell not installed): mechanical/assembly-without-shell.png
• Side view without shell: mechanical/assembly-side-no-shell.png

Wiring (XIAO pad → device)

Schematic IO8 / IO3 = GPIO numbers, not silkscreen D8/D3.

Device	Signals	XIAO pads
LCD SPI	MOSI/CLK/CS/DC	D10 / D8 / D1 / D2
Servo X (pan)	PWM	D7 (2g)
Servo Y (tilt)	PWM	D6 (large)
MAX98357	DIN/BCLK/LRC	D0 / D5 / D4 → 2011 speaker
Mic	PDM	Onboard (ESP32S3 Sense)

Details: firmware/deskbot_config.h.

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License

Scope	License	File
Hardware (mechanical/)	CERN-OHL-S-2.0	mechanical/LICENSE
Software (firmware/ etc.)	GNU GPL v3.0	firmware/LICENSE