6 layers26.9 × 26.9 mm
OpenFC
OpenDrone-hw/OpenFC-Lite-Mini
Open-source Betaflight flight controller. RP2354A, 20x20 mm, 6-layer, 3-6S, CERN-OHL-S-2.0.
131 parts147CERN-OHL-S-2.0
2 layers
A simple microcontroller PCB in KiCad 9.0
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 29
- Pads
- 93
- Tracks, vias
- 101, 70
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 May 2026
- Updated
- 27 May 2026
Overview
First MCU is an open-source printed circuit board by Thorfinn390, from the Thorfinn390/My_First_MicroControllerPCB repository on GitHub. It is a 2-layer board with 20 parts on 29 nets, routed with 101 tracks and 70 vias.
It is built around the LP5912-3.3DRVR. Its parts include 6 capacitors, 6 resistors, 2 ICs, 2 diodes and 1 transistor. It belongs with the STM32 boards of this library.
Main components
1README
README.mdA microcontrolelr PCB with KiCad 9.0
I learned how to design a PCB following this tutorial (https://youtu.be/AaEPY4PrPFY?si=5xtW_252XXaHk94x) (https://youtu.be/9NSb59LdO20?si=RPC4X8oC_Yh1AQq_). I really enjoyed the process and the personal research of how everything works and communicate with each other, it was fun and I will definitely make more PCBs soon.
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 1uF | Capacitor_SMD:C_0805_2012Metric | C2, C4, C5, C6 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | LED | LED_SMD:LED_0805_2012Metric | D1, D2 |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_E-Switch_TL3301NxxxxxG | BOOT1, RESET1 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | 200 | Resistor_SMD:R_0805_2012Metric | R6 |
| 1 | LP5912-3.3DRV | Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm_ThermalVias | U2 |
| 1 | NMOS | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | STM32F042F6Px | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
Questions
What parts does the First MCU use?
20 parts, built around the LP5912-3.3DRVR. 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 First MCU KiCad files?
From the Thorfinn390/My_First_MicroControllerPCB repository on GitHub, at the commit this page was made from: the board is first_MCU/first_MCU.kicad_pcb and its schematic first_MCU/first_MCU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the First MCU design in my own project?
Its repository states no licence, so its author keeps all rights: ask Thorfinn390 before reusing the design.
Similar boards
- 6 layers37.9 × 37.9 mm
OpenFC
OpenDrone-hw/OpenFC-Lite
Open-source Betaflight flight controller. RP2354B, 30.5x30.5 mm, 6-layer, 3-8S, CERN-OHL-S-2.0.
164 parts85CERN-OHL-S-2.0 - 2 layers212.5 × 99.5 mm
- 4 layers70.2 × 70.1 mm
Wireless Communication Board (WCB)V2.4
greghulette/Wireless_Communication_Board-WCB
Repository for the Wireless Commuincation Board (WCB)
65 parts16GPL-3.0 - 4 layers62.8 × 61.7 mm
- 8 layers28.9 × 28.9 mm
OpenAIO Whoop
OpenDrone-hw/OpenAIO-Whoop
Open-source 1S whoop AIO: flight controller, 4-channel brushless ESC, ExpressLRS receiver and analog VTX, 25.5x25.5 mm. Planned.
249 parts13CERN-OHL-S-2.0 - 4 layers53 × 40 mm
- 8 layers38 × 38 mm
Kolibri v0.5
bastian2001/Kolibri-FC-Hardware
Hardware for the Kolibri Flight Controller. 30mm/20mm FC with RP2350 + ELRS onboard
221 parts8GPL-3.0