BigTreeTech KNOMI 2
1.28-inch round 240x240 LCD display for Voron StealthBurner toolhead. ESP32 MCU with WiFi and Bluetooth LE, shows print status, temperatures, and progress with customizable animated UI.
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Specifications
Components
Espressif ESP32 dual-core Xtensa LX6 @ 240MHz with 2.4GHz WiFi and Bluetooth 5 LE
Galaxycore GC9A01 SPI LCD driver for 1.28-inch 240x240 circular displays
Bus Interfaces
The BigTreeTech KNOMI 2 is a compact 1.28-inch round LCD display designed to fit inside the Voron StealthBurner toolhead, adding a visual status indicator directly on the print head. It is driven by a GC9A01 display controller via SPI, delivering a 240x240 pixel circular display with a 178° viewing angle and 400 cd/m² brightness.
The KNOMI 2 is powered by an ESP32 microcontroller with integrated 2.4GHz WiFi (802.11 b/g/n, up to 150Mbps) and Bluetooth 5 LE. It connects to the Klipper/Moonraker API over the local network, displaying real-time data including heated bed temperature, nozzle temperature, homing status, mesh leveling progress, and print progress. The device also ships with mDNS support, accessible at http://knomi.local for browser-based OTA firmware updates.
Onboard memory is 16MB Flash and 8MB PSRAM. Power input is 5V/1A (rated 5W) via a dedicated connector supporting DC 5V to 24V input range, with logic at 3.3V. A BOOT button on the PCB enables forced firmware flashing via USB Type-C. The firmware source code, Klipper configuration files, and hardware schematics are all open-source on GitHub.
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