Uuart
About the Uuart PCB
Uuart is an open source STM32 PCB design by brainsmoke, published on GitHub. It is a 2-layer board measuring 18 × 11 mm, with 15 components from 10 distinct parts.
Its main chip is the STM32F042F4Px, from the STM32 family. Other key parts include the AP2112K-3.3. By type, the board carries 5 resistors, 3 capacitors, 2 ICs, 2 connectors, 2 diodes and 1 switch.
It belongs with the usb & debug tools designs in this gallery.
From the project
Green: simple 3v3 rx/tx (CH340N chip) Black: 3v3 rx/tx & reset circuit compatible with esptool (CH340C chip) * Both: AP2112K-3.3 LDO
Main components on the Uuart
Uuart bill of materials (BOM)
15 components, 10 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32F042F4Px | TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | AP2112K-3.3 | SOT-23-5 | U2 |
| 1 | USB_C_Receptacle_USB2.0 | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | Conn_02x04_Top_Bottom | PinSocket_2x04_P2.54mm_Edge | J2 |
| 1 | SW_SPST | SW_Push_1P1T_NO_CK_KMR2 | SW1 |
| 2 | LED | LED_0402_1005Metric | D1, D2 |
| 1 | 1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 2 | 1uF | C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C2, C3 |
| 2 | 5k1 Ohm | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R1, R2 |
| 3 | 10k Ohm | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R3, R4, R5 |
Uuart design files
The KiCad project lives in the brainsmoke/uuart repository on GitHub; these links point at the commit this page was built from.
- Layoutstm/base.kicad_pcb
Uuart: common questions
What microcontroller does the Uuart use?
The Uuart is built around the STM32F042F4Px, from the STM32 family.
How big is the Uuart PCB?
The Uuart measures 18 × 11 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Uuart?
15 components, from 10 distinct parts. The full bill of materials is listed on this page.
Where can I download the Uuart design files?
From the brainsmoke/uuart repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Uuart design in my own project?
The repository has no license, so all rights stay with brainsmoke. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Uuart without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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