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Openeew sensor

openeew·openeew-sensor·pcb/pcb.kicad_pcb

Openeew sensor PCB layout, top view — open source ESP32 board by openeew
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About the Openeew sensor PCB

Openeew sensor is an open source ESP32 PCB design by openeew, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 75 × 50 mm, with 101 components from 41 distinct parts.

Its main chip is the ESP32-WROOM-32D, from the ESP32 family. Other key parts include the LAN8710A, ADXL355, MIC5219-3.3YM5, 74LVC1G17 and CP2102N-A01-GQFN24. By type, the board carries 35 resistors, 34 capacitors, 7 diodes, 6 ICs, 5 transistors and 5 connectors.

It belongs with the sensors, iot & wireless and science & space designs in this gallery.

From the project

Hardware for an OpenEEW sensor

This hardware design has been created to drastically reduce the cost of a seismometer through the usage of off-the-shelf parts. The key component is the ADXL355 MEMS accelerometer, which has far lower noise than other accelerometers on the market. This low noise allows it to detect earthquakes at further distances.

The sensor can be bought from PCBWay, Grillo, or made following these instructions.

Openeew sensor, from the project README
From the project README

Main components on the Openeew sensor

ESP32-WROOM-32DLAN8710AADXL355MIC5219-3.3YM574LVC1G17CP2102N-A01-GQFN24

Openeew sensor bill of materials (BOM)

101 components, 41 distinct parts.

QtyPartRefs
1
ESP32-WROOM-32D
U1
1
LAN8710A
U2
1
ADXL355
U3
1
MIC5219-3.3YM5
U4
1
74LVC1G17
U5
1
CP2102N-A01-GQFN24
U6
4
BC817
Q1, Q3, Q4, Q5
1
WPM2015-3_TR
Q2
1
I2C
J1
1
HR911105A
J2
1
USB_C_Receptacle_USB2.0
J3
1
GPS
J4
1
DNP
J5
1
Piezo Buzzer
BZ1
1
Polyfuse
F1
2
DNP
SW1, SW2
3
WS2812B
D1, D2, D3
1
PRTR5V0U2X
D4
3
DNP
D5, D6, D7
4
MPZ2012S601ATD25
FB1, FB2, FB3, L2
Show 21 more
QtyPartRefs
1
DNP
L1
3
22uF
C1, C4, C17
2
10uF
C2, C9
4
1uF
C3, C13, C18, C30
17
100nF
C5, C6, C8, C10, C12, C14, C15, C16 +9
3
10uF
C7, C25, C28
1
2.2uF
C11
1
4.7uF
C27
2
4.7nF
C29, C31
1
470pF
C34
12
10k
R1, R3, R5, R6, R12, R15, R23, R24 +4
6
1k
R2, R13, R31, R32, R101, R102
1
12.1k
R7
4
49.9k
R8, R9, R10, R11
1
510
R14
2
5.11k
R16, R17
1
22.1k
R18
1
47.5k
R19
3
DNP
R20, R21, R26
2
1M
R22, R28
2
2.2k
RN1, RN2

Openeew sensor design files

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

Openeew sensor: common questions

What microcontroller does the Openeew sensor use?

The Openeew sensor is built around the ESP32-WROOM-32D, from the ESP32 family.

How big is the Openeew sensor PCB?

The Openeew sensor measures 75 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Openeew sensor?

101 components, from 41 distinct parts. The full bill of materials is listed on this page.

Where can I download the Openeew sensor design files?

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

Can I use the Openeew sensor design in my own project?

Yes, under the terms of its Apache-2.0 license, which openeew chose for the repository.

Can I test firmware for the Openeew sensor 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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