# 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.

## Quick Facts

- **Brand:** BigTreeTech
- **Board Type:** Display
- **Product Readiness:** consumer
- **CPU:** ESP32 dual-core Xtensa LX6 @ 240MHz
- **CPU Architecture:** Xtensa LX6
- **CPU Cores:** 2
- **RAM:** 8MB PSRAM
- **Flash:** 16MB
- **Power:** 5V/1A (DC 5-24V input)
- **Operating Voltage:** 3.3V
- **Antenna:** Built-in PCB antenna
- **SD Card:** No
- **Display:** 1.28 inch Round LCD (SPI) 240x240

## Connectivity

- **Wifi:** true
- **Bluetooth:** true

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes

## Compatible Firmware

Klipper

## Use Cases

- 3D Printing

## Components

- **ESP32** (mcu): Espressif ESP32 dual-core Xtensa LX6 @ 240MHz with 2.4GHz WiFi and Bluetooth 5 LE — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32_datasheet_en.pdf&ref=openhardware.directory&product=bigtreetech-knomi-2&source=md-export)
- **GC9A01** (display-driver): Galaxycore GC9A01 SPI LCD driver for 1.28-inch 240x240 circular displays — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.waveshare.com%2Fdatasheet%2FLCD_en_PDF%2FGC9A01A.pdf&ref=openhardware.directory&product=bigtreetech-knomi-2&source=md-export)

## Protocols

- **SPI**
- **WiFi**
- **I2C**
- **USB**

## Description

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.

## Where to Buy

- [BIQU Equipment](https://openhardware.directory/r?to=https%3A%2F%2Fbiqu.equipment%2Fproducts%2Fbigtreetech-knomi-2-for-voron-stealthburner&ref=openhardware.directory&product=bigtreetech-knomi-2&source=md-export)

## Resources

- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fbigtreetech%2FKNOMI&ref=openhardware.directory&product=bigtreetech-knomi-2&source=md-export)
- [product](https://openhardware.directory/r?to=https%3A%2F%2Fbiqu.equipment%2Fproducts%2Fbigtreetech-knomi-2-for-voron-stealthburner&ref=openhardware.directory&product=bigtreetech-knomi-2&source=md-export)
- [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fglobal.bttwiki.com%2FKNOMI2.html&ref=openhardware.directory&product=bigtreetech-knomi-2&source=md-export)

## Tags

`3d-printing`, `display`, `klipper`, `voron`, `stealthburner`, `esp32`, `round-display`, `1.28-inch`, `toolhead`, `bigtreetech`, `wifi`, `ble`

## Images

![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/a75b09e47ad4.png)
![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/84db7265fc4c.png)
![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/f6409f74839d.png)
![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/2a8a8ce51f09.png)
![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/b7d77dc8e080.png)
![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/e9504df75e27.png)
![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/afa5ea2dbde6.png)
![BigTreeTech KNOMI 2](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-knomi-2/e8ba21d76688.png)

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