HardLabs

Class 2a

rmd6502·coaster

Class 2a PCB layout, top view — open source STM32 board by rmd6502

About the Class 2a PCB

Class 2a is an open source STM32 PCB design by rmd6502, published on GitHub. It is a 2-layer board measuring 51.4 × 47.6 mm, with 34 components from 18 distinct parts.

Its main chip is the C724040, from the STM32 family. Other key parts include the LR4054, TPS613222ADBV and AMS1117-3.3. By type, the board carries 13 diodes, 8 capacitors, 4 ICs, 3 resistors, 2 connectors and 1 battery holder.

Main components on the Class 2a

C724040LR4054TPS613222ADBVAMS1117-3.3

Class 2a bill of materials (BOM)

34 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C724040
STM32G030F6P6
U1
1
LR4054
U2
1
TPS613222ADBV
U3
1
AMS1117-3.3
U4
1
C2927040
USB_C_Receptacle
J1
1
CONN_ARM_JTAG_SWD_10
Conn_ARM_JTAG_SWD_10
J3
1
CS2032-LIR rechargeable
BT1
1
C202411
R_Potentiometer
RV1
1
C221660
SW_SPST
SW1
12
WS2812B
D1, D2, D3, D4, D5, D6, D7, D8 +4
1
SD103
D13
1
4.7UH
4.7uh
L1
2
100NF
100nf
C1, C4
2
100N
100n
C2, C3
2
10UF
10uf
C5, C6
2
4.7U
4.7u
C7, C8
1
2k
R1
2
5K1
5k1
R2, R3

Class 2a design files

The KiCad project lives in the rmd6502/coaster repository on GitHub; these links point at the commit this page was built from.

Class 2a: common questions

What microcontroller does the Class 2a use?

The Class 2a is built around the C724040, from the STM32 family.

How big is the Class 2a PCB?

The Class 2a measures 51.4 × 47.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Class 2a?

34 components, from 18 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Class 2a design files?

From the rmd6502/coaster repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Class 2a design in my own project?

The repository has no license, so all rights stay with rmd6502. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Class 2a 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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