HardLabs

B52E

OS-Q·B52E·hardware-revision-E/ESP32-PoE_Rev_E.kicad_pcb

B52E PCB layout, top view — open source ESP32 board by OS-Q

About the B52E PCB

B52E is an open source ESP32 PCB design by OS-Q, published on GitHub. It is a 2-layer board measuring 28 × 75 mm, with 117 components from 62 distinct parts.

Its main chip is the ESP-WROOM-32, from the ESP32 family. Other key parts include the CH340T(SSOP20W), BL4054B-42TPRN(SOT23-5), LAN8710A-EZC(QFN32), SY8089AAAC(SOT23-5) and Si3402-B-GM(QFN-20_5x5mm). By type, the board carries 45 resistors, 28 capacitors, 7 diodes, 6 ICs, 6 inductors and 4 LEDs.

From the project

PoE

Main components on the B52E

CH340T(SSOP20W)BL4054B-42TPRN(SOT23-5)LAN8710A-EZC(QFN32)SY8089AAAC(SOT23-5)Si3402-B-GM(QFN-20_5x5mm)ESP-WROOM-32

B52E bill of materials (BOM)

117 components, 62 distinct parts.

QtyPartRefs
1
CH340T(SSOP20W)
U1
1
BL4054B-42TPRN(SOT23-5)
U3
1
LAN8710A-EZC(QFN32)
U4
1
SY8089AAAC(SOT23-5)
U7
1
Si3402-B-GM(QFN-20_5x5mm)
U8
1
ESP-WROOM-32
U9
1
Q12MHz/20pF/10ppm/4P/3.2x2.5mm
Q1
2
BC817-40(SOT23)
Q2, Q3
1
DW02R
BAT1
1
Opened
BAT_SENS_E1
2
IT1185AU2
BUT1, RST1
2
Closed
EN_CT1, EN_CT2
2
NS(HN1x10)
EXT1, EXT2
3
WPM2015-3/TR
FET1, FET2, FET3
1
TFC-9P-1.7H(ATFFS150A01BR016)
MICRO_SD1
3
RA1206_(4X0603)_4B8_2.2k
RM1, RM2, RM3
1
LMUN2211LT1G(SOT-23)
T1
1
P-B-V-10-LF
UEXT1
1
MISB-SWMM-5B-LF(USB_MICRO)
USB-UART1
2
LED/YELLOW/0603
ACT1, CHRG1
Show 42 more
QtyPartRefs
1
LED/GREEN/0603
LNK1
1
LED/RED/0603
PWR1
2
1N5822/SS34/SMA
D1, D3
1
BAT54C(SOT23-3)
D2
3
1N5819S4(SOD-123)
D4, D6, D7
1
SS510/100V/5A/0.85V/DO214AB(SMC)
D5
3
FB0805/600R/2A
L1, L5, L6
1
2.2uH/1.5A/DCR=72mR/20%/3.00x3.00x1.50mm/CD32(NR3015T2R2M)
L2
1
NA(FB0805/600R/2A)
L3
1
33uH/2.1A/DCR=0.1R/20%/DBS135(PD3316MT330)
L4
7
22uF/6.3V/20%/X5R/C0603
C1, C6, C7, C9, C10, C13, C30
1
1nF/2000V/10%/X7R/C1206
C2
2
47uF/6.3V/20%/X5R/C0805
C3, C22
2
27pF/50V/5%/C0G/C0402
C4, C5
7
100nF/16V/10%/X7R/C0402
C8, C11, C14, C15, C16, C18, C25
1
2.2uF/100V/20%/X7R/C1206(AVX_12061C225KAT2A_Comet)
C12
1
2.2uF/6.3V/10%/X5R/C0603
C17
2
1nF/50V/10%/X7R/C0402
C19, C26
1
1uF/10V/20%/X5R/C0603
C20
1
NA(10uF/6.3V/20%/X5R/C0603)
C21
1
100nF/100V/20%/C1206
C24
1
15uF/100V/20%/RM2.5/6.3x11mm(Farnell:1281844)
C27
1
680uF/10V/20%/105C/RM3.5/8x11.5mm
C29
10
10k/R0402
R1, R2, R18, R19, R25, R32, R36, R37 +2
3
1k/R0402
R3, R20, R21
2
47k/R0402
R4, R33
7
2.2k/R0402
R5, R6, R8, R14, R15, R31, R35
1
100k/R0402
R9
4
49.9R/1%/R0402
R10, R11, R12, R13
1
NA(10k/R0402)
R16
2
470k/R0402
R17, R22
3
220R/R0402
R24, R46, R47
1
12.1k/1%/R0402
R26
1
220k/R0402
R29
1
49.9k/1%/R0402
R30
1
NA(49.9R/1%/R0402)
R34
1
25.5k/1%/R0603
R38
1
10R/R0402
R40
1
1k/1%/R0402
R41
1
3.01k/1%/R0402
R42
2
220R/5%/0.25W/R1206
R43, R45
2
NA/R0402
R44, R49

B52E design files

The KiCad project lives in the OS-Q/B52E repository on GitHub; these links point at the commit this page was built from.

B52E: common questions

What microcontroller does the B52E use?

The B52E is built around the ESP-WROOM-32, from the ESP32 family.

How big is the B52E PCB?

The B52E measures 28 × 75 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the B52E?

117 components, from 62 distinct parts. The full bill of materials is listed on this page.

Where can I download the B52E design files?

From the OS-Q/B52E repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the B52E design in my own project?

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

Can I test firmware for the B52E 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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