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Thrcot·ThormasMK2-circuit·Main/Main.kicad_pcb

Main PCB layout, top view — open source ESP32 board by Thrcot

About the Main PCB

Main is an open source ESP32 PCB design by Thrcot, published on GitHub. It is a 2-layer board measuring 100 × 66 mm, with 108 components from 37 distinct parts.

Its main chip is the SEED_XIAO_ESP32C3, from the ESP32 family. Other key parts include the STM32F446RETX, AZ1117CH-3.3TRG1 and STM32F103CBTX. By type, the board carries 36 resistors, 31 capacitors, 14 diodes, 10 connectors, 7 ICs and 5 switches.

Main components on the Main

SEED_XIAO_ESP32C3STM32F446RETXAZ1117CH-3.3TRG1STM32F103CBTX

Main bill of materials (BOM)

108 components, 37 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
SEED_XIAO_ESP32C3
Seed_XIAO_ESP32C3
IC1
1
STM32F446RETX
STM32F446RETx
U1
1
AZ1117CH-3.3TRG1
AZ1117CH-3_3TRG1
Diodes Incorporated
U2
1
STM32F103CBTX
STM32F103CBTx
U3
1
~
U4
1
~
U5
1
~
U6
1
MMBT3904
Q1
2
8MHZ
8mHz
Y1, Y2
1
PWR_IN
J1
1
Ball
J2
1
MotorDriver
J3
1
Line
J4
1
Camera
J5
1
Speaker
J6
1
Catch
J7
1
ST-LINK
J8
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J9
1
CONN_01X05
Conn_01x05
J11
1
350MA
350mA
F1
Show 17 more
QtyPartRefs
5
SW_Push
SW2, SW3, SW4, SW5, SW6
14
LED
D1, D2, D3, D4, D5, D6, D7, D8 +6
1
FerriteBead
FB1
3
4.7UF
4.7uF
C1, C6, C25
1
10UF
10uF
C2
1
22UF
22uF
C3
19
0.1UF
0.1uF
C4, C5, C7, C8, C9, C10, C12, C15 +11
1
1UF
1uF
C11
2
120UF
120uF
C13, C14
4
10PF
10pF
C22, C23, C30, C32
26
10K
10k
R1, R2, R3, R5, R6, R7, R8, R9 +18
2
100
R25, R33
2
5.1K
5.1k
R28, R29
1
1.5K
1.5k
R30
1
39K
39k
R32
2
4.7K
4.7k
R34, R35
2
1k
R36, R37

Main design files

The KiCad project lives in the Thrcot/ThormasMK2-circuit repository on GitHub; these links point at the commit this page was built from.

Main: common questions

What microcontroller does the Main use?

The Main is built around the SEED_XIAO_ESP32C3, from the ESP32 family.

How big is the Main PCB?

The Main measures 100 × 66 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Main?

108 components, from 37 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 Main design files?

From the Thrcot/ThormasMK2-circuit 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 Main design in my own project?

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

Can I test firmware for the Main without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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