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Phone board mems

JamesTwallin·gas_sensor·hardware/phone_board_mems/phone_board_mems.kicad_pcb

Phone board mems layout, top view — open source ESP32 board by JamesTwallin

About the Phone board mems

Phone board mems is an open source ESP32 PCB design by JamesTwallin, published on GitHub under the MIT license. It is a 4-layer board measuring 55 × 31 mm, with 58 components from 27 distinct parts.

Its main chip is the ESP32-S3-MINI-1-N8, from the ESP32 family. Other key parts include the USBLC6-2SC6, BQ24073RGTR, AP2112K-3.3, ME6211C28M5G-N and ADS1115IDGSR. By type, the board carries 25 resistors, 17 capacitors, 7 ICs, 5 switches, 2 connectors and 1 transistor.

It belongs with the sensors and power & battery designs in this gallery.

From the project

A 55 × 31 mm, 4-layer board: the rev C phone-companion board with its two Figaro TO-5 cans replaced by Winsen GM-402B MEMS sensors and the 5 V heater boost replaced by a 2.8 V LDO. Everything else is the rev C circuit: bare ESP32-S3-MINI-1, BQ24073 charger, USB-C, ADS1115, SHT40

A 55 × 31 mm, 4-layer board: the rev C phone-companion board with its two Figaro TO-5 cans replaced by Winsen GM-402B MEMS sensors and the 5 V heater boost replaced by a 2.8 V LDO. Everything else is the rev C circuit: bare ESP32-S3-MINI-1, BQ24073 charger, USB-C, ADS1115, SHT40 on a slotted tongue. The electrical spec is docs/phoneboard.md; the rev C board it descends from is hardware/phoneboard.

Phone board mems, from the project README
From the project README

Main components on the Phone board mems

USBLC6-2SC6BQ24073RGTRAP2112K-3.3ME6211C28M5G-NESP32-S3-MINI-1-N8ADS1115IDGSRSHT40-AD1B-R2

Phone board mems bill of materials (BOM)

58 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-2SC6
U1
1
BQ24073RGTR
U2
1
AP2112K-3.3
U3
1
ME6211C28M5G-N
ME6211C28
U4
1
ESP32-S3-MINI-1-N8
U5
1
ADS1115IDGSR
U6
1
SHT40-AD1B-R2
SHT40-AD1B
U7
1
AO3401A
Q1
1
TYPE-C-31-M-12
J1
1
C295747
LiPo 1S
J2
2
GM-402B
S1, S2
1
C431540
POWER
SW1
1
C318884
RESET
SW2
1
C318884
BOOT
SW3
1
WS2812B-2020
D1
1
10UF
10uF
C1
5
10UF
10uF
C2, C3, C4, C6, C8
3
1UF
1uF
C5, C10, C16
8
100NF
100nF
C9, C11, C12, C13, C14, C15, C20, C23
2
5.1K
5.1k
R1, R2
Show 7 more
QtyPartRefs
10
10K
10k
R3, R6, R7, R11, R12, R19, R20, R21 +2
1
1.5K
1.5k
R4
1
1.8K
1.8k
R5
4
100K
100k
R10, R15, R16, R26
3
1M
R13, R14, R27
2
4.7K
4.7k
R17, R18
2
1k
R22, R25

Phone board mems design files

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

Phone board mems: common questions

What microcontroller does the Phone board mems use?

The Phone board mems is built around the ESP32-S3-MINI-1-N8, from the ESP32 family.

How big is the Phone board mems?

The Phone board mems measures 55 × 31 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Phone board mems?

58 components, from 27 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 Phone board mems design files?

From the JamesTwallin/gas_sensor 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 Phone board mems design in my own project?

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

Can I test firmware for the Phone board mems 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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