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ANC Helmet - main board (left earcup)

baba2712·smart-helmet-with-anc·hardware/main-board/main-board.kicad_pcb

ANC Helmet - main board (left earcup) layout, top view — open source STM32 board by baba2712
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About the ANC Helmet - main board (left earcup)

ANC Helmet - main board (left earcup) is an open source STM32 PCB design by baba2712, published on GitHub under the MIT license. It is a 4-layer board measuring 60 × 50 mm, with 139 components from 65 distinct parts.

Its main chip is the STM32H743VIT6, from the STM32 family. Other key parts include the USBLC6-2SC6, MCP73831T-2ACI/OT, TPS63001DRCR, LP5907MFX-2.8/NOPB and MCP6022-I/ST. By type, the board carries 62 capacitors, 43 resistors, 10 ICs, 9 connectors, 6 diodes and 3 inductors.

From the project

An industrial safety helmet with hybrid active noise cancellation (feed-forward + adaptive feedback FxLMS) on an STM32H743. Target: take ~100 dB(A) plant noise down to ≤ 75 dB(A) at the ear (passive earcup + ANC), below the 85 dB(A) 8-hour limit. Also a built-in noise dosimeter,

An industrial safety helmet with hybrid active noise cancellation (feed-forward + adaptive feedback FxLMS) on an STM32H743. Target: take ~100 dB(A) plant noise down to ≤ 75 dB(A) at the ear (passive earcup + ANC), below the 85 dB(A) 8-hour limit. Also a built-in noise dosimeter, hear-through for speech and alarms, a seal monitor that measures the cup's attenuation while it is worn and warns when the seal leaks (glasses, hair, a tilted helmet), and an optional BLE link.

Main components on the ANC Helmet - main board (left earcup)

USBLC6-2SC6MCP73831T-2ACI/OTTPS63001DRCRLP5907MFX-2.8/NOPBSTM32H743VIT6MCP6022-I/STTPA6132A2RTER

ANC Helmet - main board (left earcup) bill of materials (BOM)

139 components, 65 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-2SC6
U1
1
MCP73831T-2ACI/OT
MCP73831-2
U2
1
TPS63001DRCR
TPS63001
U3
1
LP5907MFX-2.8/NOPB
LP5907-2.8
U4
1
STM32H743VIT6
U5
4
MCP6022-I/ST
MCP6022
U6, U7, U8, U9
1
TPA6132A2RTER
TPA6132A2
U10
1
AO3401A
Q1
1
MMBT3904
Q2
1
25 MHz 3225 CL=10pF +-20ppm (e.g. Abracon ABM8)
25MHz
Y1
1
HRO TYPE-C-31-M-12
USB-C
J1
1
JST S2B-PH-SM4-TB
BATTERY 1S Li-ion (protected)
J2
1
JST SM02B-SRSS-TB
EXT BUTTON
J3
1
Cortex debug 2x5 1.27 mm SMD
SWD
J4
1
JST SM04B-SRSS-TB
LEFT OUTSIDE (REF) MIC
J5
1
JST SM04B-SRSS-TB
LEFT IN-CUP (ERR) MIC
J6
1
JST SM06B-SRSS-TB
TO RIGHT CUP
J7
1
JST SM02B-SRSS-TB
LEFT SPEAKER
J8
1
JST SM06B-SRSS-TB
BLE UART MODULE
J9
1
Littelfuse 1206L050YR
0.5A
F1
Show 45 more
QtyPartRefs
1
C&K PTS810 SJM 250 SMTR LFS
POWER
SW1
1
C&K PTS810 SJM 250 SMTR LFS
BOOT
SW2
1
0603 orange LED
orange
D1
1
B5819W
D2
1
BAT54C
D3
1
0603 red LED
red
D4
1
0603 green LED
green
D5
1
0603 blue LED
blue
D6
2
BLM18PG221SN1D
220R@100MHz
FB1, FB2
1
2.2 uH >=1.5 A shielded 3x3 (e.g. TDK VLS3015ET-2R2M)
2.2u
L1
1
4.7n X7R 50V
4.7n
C1
2
4.7u X5R 10V
4.7u
C2, C3
16
100n X7R
100n
C4, C10, C11, C12, C13, C14, C15, C17 +8
1
10u X5R 10V
10u
C5
2
22u X5R 10V
22u
C6, C7
12
1u X7R
1u
C8, C20, C22, C29, C30, C31, C38, C39 +4
1
4.7u X5R
4.7u
C9
1
4.7u X7R
4.7u
C16
2
2.2u X7R
2.2u
C18, C19
2
12p C0G
12p
C25, C26
2
10u X5R
10u
C27, C62
2
220p C0G
220p
C32, C33
2
4.7n C0G
4.7n
C34, C42
2
1n C0G
1n
C35, C43
4
2.2n C0G
2.2n
C37, C45, C46, C47
2
100p C0G
100p
C40, C41
2
3.3n C0G
3.3n
C48, C52
2
1.5n C0G
1.5n
C49, C53
3
2.2u X5R
2.2u
C57, C59, C60
1
1u X5R
1u
C61
2
5.1k 1% 02_1
5.1k
R1, R2
1
1M 1% 02_1
1M
R3
7
100k 1% 02_1
100k
R4, R9, R10, R11, R12, R13, R15
1
200k 1% 02_1
200k
R5
1
2.0k 1% 02_1
2.0k
R6
3
1k 1% 02_1
1k
R7, R18, R19
2
47k 1% 02_1
47k
R8, R14
4
10k 1% 02_1
10k
R16, R17, R21, R22
1
470 1% 02_1
470
R20
1
10 1% 02_1
10
R23
4
22k 1% 02_1
22k
R24, R25, R31, R32
2
75k 1% 02_1
75k
R26, R27
8
8.2k 1% 02_1
8.2k
R28, R29, R35, R36, R40, R41, R42, R43
4
47 1% 02_1
47
R30, R37, R38, R39
2
150k 1% 02_1
150k
R33, R34

ANC Helmet - main board (left earcup) design files

The KiCad project lives in the baba2712/smart-helmet-with-anc repository on GitHub; these links point at the commit this page was built from.

ANC Helmet - main board (left earcup): common questions

What microcontroller does the ANC Helmet - main board (left earcup) use?

The ANC Helmet - main board (left earcup) is built around the STM32H743VIT6, from the STM32 family.

How big is the ANC Helmet - main board (left earcup)?

The ANC Helmet - main board (left earcup) measures 60 × 50 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the ANC Helmet - main board (left earcup)?

139 components, from 65 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 ANC Helmet - main board (left earcup) design files?

From the baba2712/smart-helmet-with-anc 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 ANC Helmet - main board (left earcup) design in my own project?

Yes, under the terms of its MIT license, which baba2712 chose for the repository.

Can I test firmware for the ANC Helmet - main board (left earcup) 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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