HardLabs

MB02A2

GOS2022·Hardware·PB01A1/01_Design_phase/KiCad/mb02a1.kicad_pcb

MB02A2 PCB layout, top view — open source ESP8266 board by GOS2022
Simulate this board

About the MB02A2 PCB

MB02A2 is an open source ESP8266 PCB design by GOS2022, published on GitHub under the MIT license. It is a 2-layer board measuring 130 × 105 mm, with 96 components from 35 distinct parts.

Its main chip is the WEMOS_D1_mini, from the ESP8266 family. Other key parts include the STM32F446RET6, AMS1117-3.3, CH340G, W25Q64JVS and 25LC256. By type, the board carries 23 resistors, 15 diodes, 13 capacitors, 12 ICs, 4 connectors and 3 crystals.

From the project

Last updated: 2025-07-04 (c) 2025, Ahmed Gazar

Main components on the MB02A2

STM32F446RET6AMS1117-3.3CH340GW25Q64JVS25LC25625LC640NUCLEO-F446REWEMOS_D1_miniDS3231MMCP23017_SO

MB02A2 bill of materials (BOM)

96 components, 35 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F446RET6
ACS712-05B
U1
1
AMS1117-3.3
CH340G
U2
2
CH340G
U3, U4
1
AMS1117-3.3
U5
1
W25Q64JVS
U6
1
25LC256
U7
1
25LC640
U8
1
NUCLEO-F446RE
U9
1
WEMOS_D1_mini
U10
1
DS3231M
U11
1
MCP23017_SO
U12
3
12 MHz
X1, X2, X3
4
USB B mini
J1, J2, J3, J4
15
Conn_01x02_Pin
ADC.1, ADC.2, DAC.1, EXTI.1, EXTI.2, EXTI.3, PWM.1, PWM.2 +7
1
BC2032-E2
B1
1
Conn_01x14_Pin
DISPLAY1
2
Conn_01x08_Pin
EXIO.1, EXIO.2
1
RKP-SMDB050
F1
4
Conn_01x04_Pin
I2C1.1, I2C1.2, I2C1.3, I2C1.4
2
Conn_01x06_Pin
SPI2.1, SPI2.2
Show 15 more
QtyPartRefs
1
LTST-C150GKT
LED
D1
1
LTST-C150YKT
1N4001
D2
13
LED
D3, D4, D5, D6, D7, D8, D9, D10 +5
1
CC1206CRNPO9BN6R8
1n
C1
1
CC1206CRNPO9BN6R8
22p
C2
1
1206B104K500BD
22p
C3
2
1206B104K500BD
100n
C4, C5
4
22p
C6, C7, C10, C11
4
100n
C8, C9, C12, C13
1
220R
R1
2
10k
R2, R3
16
1k5
R4, R5, R6, R7, R8, R9, R10, R11 +8
1
1k
R17
1
2k
R18
2
4k7
R19, R20

MB02A2 design files

The KiCad project lives in the GOS2022/Hardware repository on GitHub; these links point at the commit this page was built from.

MB02A2: common questions

What microcontroller does the MB02A2 use?

The MB02A2 is built around the WEMOS_D1_mini, from the ESP8266 family.

How big is the MB02A2 PCB?

The MB02A2 measures 130 × 105 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MB02A2?

96 components, from 35 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 MB02A2 design files?

From the GOS2022/Hardware 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 MB02A2 design in my own project?

Yes, under the terms of its MIT license, which GOS2022 chose for the repository.

Can I test firmware for the MB02A2 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.

More boards in Hardware

Similar boards