2 layers90 × 89.4 mm
2 layers58.4 × 21.6 mm
LimbusZero
LMWB/LimbusZeroCustom Microcontroller Board based on STM32C0-Series
- Size
- 58.4 × 21.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 39
- Pads
- 100
- Tracks, vias
- 243, 35
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 30 Jun 2024
- Updated
- 2 Jun 2025
Overview
LimbusZero is an open-source printed circuit board by LMWB, from the LMWB/LimbusZero repository on GitHub, published under the MIT licence. It is a 2-layer board of 58.4 × 21.6 mm with 17 parts on 39 nets, routed with 243 tracks and 35 vias.
It is built around the STM32C031K6T6 and AMS1117-3.3. Its parts include 5 capacitors, 4 connectors, 3 ICs, 3 diodes and 2 resistors. It belongs with the STM32 boards of this library.
Main components
2
STM32C031K6T6
LQFP-32(7x7)-40℃~+85℃ 12KB 12bit 2V~3.6V 30 32 Bit 32KB 48MHz ARM Cortex-M0+ Built-in+External FLASH LQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdLimbusZero
Custom Microcontroller Board based on STM32C0-Series
Features
- STM32C031K6T6 Microcontroller
- ST M24C01 I2C EEPROM
- no crystal oscillator since this board uses STM32 build in 48MHz HSI48RC clock generator
- accuracy needs to be discussed but since software is working fine I guess there will be no dramatic issus
- Power indicator LED
- USB mini as power supply NO DATA!
- User LED
- 2.54mm Pin Headers that would fit on regular breadbords for rapid prototyping
- debug / programming interface according to STLink that comes with most of STM32 Nucleo Boards
Firmware
There is quite extensive demo I developed for Emil's Birthday using the breadbord-IO and a neopixel ring in the software sub folder. It's written in C and uses the STM32-HAL and STM32-cubeIDE. Look closely, main-loop is empty since all features and peripherals are controlled by interrupts so the user section while(1){} remains untouched.
Todo
- add user button
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100n | Capacitor_SMD:C_1206_3216Metric | C3, C5 |
| 2 | 1u | Capacitor_SMD:C_1206_3216Metric | C1, C2 |
| 2 | 220 | Resistor_SMD:R_1206_3216Metric | R1, R2 |
| 2 | Conn_01x10 | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J3, J4 |
| 2 | LED | LED_SMD:LED_1206_3216Metric | D1, D2 |
| 1 | 4.7u | Capacitor_SMD:C_1206_3216Metric | C4 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Horizontal | J1 |
| 1 | D | Diode_SMD:D_1206_3216Metric | D3 |
| 1 | M24C01-FMN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | STM32C031K6T6 | Package_QFP:LQFP-32_7x7mm_P0.8mm | U3 |
| 1 | USB_B_Micro | Connector_USB:USB_Mini-B_Lumberg_2486_01_Horizontal | J2 |
Questions
How big is the LimbusZero PCB?
It measures 58.4 × 21.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LimbusZero use?
17 parts, built around the STM32C031K6T6 and AMS1117-3.3. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the LimbusZero KiCad files?
From the LMWB/LimbusZero repository on GitHub, at the commit this page was made from: the board is Hardware/LimbusZero.kicad_pcb and its schematic Hardware/LimbusZero.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LimbusZero design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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