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MAXWELLS0S

whoelse091·MAXWELLS0S·hardware/WEARBALE-DEVICE/Kikad-files/LORASOS.kicad_pcb

MAXWELLS0S PCB layout, top view — open source STM32 board by whoelse091
Simulate this board

About the MAXWELLS0S PCB

MAXWELLS0S is an open source STM32 PCB design by whoelse091, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 55 × 80 mm, with 39 components from 28 distinct parts.

Its main chip is the STM32_PROG, from the STM32 family. Other key parts include the RAK3172-xx-8-SM-xI, SAM-M10Q-00B, BQ25185DLHR and TPS631010YBGR. By type, the board carries 14 resistors, 11 capacitors, 4 ICs, 4 diodes, 3 connectors and 1 battery holder.

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

From the project

Open-source LoRa mesh that relays a hiker's SOS + GPS across cellular-dark mountains to Mountain Rescue. No GSM, no internet. Hardware under CERN-OHL-S.

The tourist beacon is the device a hiker carries. One button (SW1A) sends an SOS with GPS coordinates over LoRa. No configuration, no display, no pairing.

Charger (U3 — BQ25185) - Charge current set by R8: Ichg = 300 / R8 = 300 / 600 Ω ≈ 0.5 A - Kiset = 300 AΩ - Input: +5 V → Output: +BATT

Regulator (U4 — TPS631010) - LPEAK ≈ 0.724 A at VIN = 2.6 V, VOUT = 3.3 V, IOUT = 400 mA, L = 1 µH, η ≈ 0.9

Main components on the MAXWELLS0S

RAK3172-xx-8-SM-xISAM-M10Q-00BBQ25185DLHRTPS631010YBGR

MAXWELLS0S bill of materials (BOM)

39 components, 28 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
RAK3172-xx-8-SM-xI
U1
1
SAM-M10Q-00B
U2
1
BQ25185DLHR
U3
1
TPS631010YBGR
U4
1
CHARGER_CON
J1
1
STM32_PROG
J2
1
BATTERY_CON
J3
1
Battery_Cell
BT1
1
SW_Push_Dual_x2
SW1
1
BAT54J
D1
2
LED
D2, D3
1
TSD05
D5
1
1uH
L1
3
10uF
C1, C7, C9
1
47uF
C2
3
0.1uF
C3, C4, C11
1
100nF
C5
1
100uF
C6
2
1uF
C8, C10
1
511k
R1
Show 8 more
QtyPartRefs
1
91k
R2
2
470
R3, R4
1
3.3k
R5
3
10k
R6, R9, R14
1
2.4k
R7
1
600
R8
2
220
R10, R13
2
100k
R11, R12

MAXWELLS0S design files

The KiCad project lives in the whoelse091/MAXWELLS0S repository on GitHub; these links point at the commit this page was built from.

MAXWELLS0S: common questions

What microcontroller does the MAXWELLS0S use?

The MAXWELLS0S is built around the STM32_PROG, from the STM32 family.

How big is the MAXWELLS0S PCB?

The MAXWELLS0S measures 55 × 80 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the MAXWELLS0S?

39 components, from 28 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 MAXWELLS0S design files?

From the whoelse091/MAXWELLS0S 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 MAXWELLS0S design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which whoelse091 chose for the repository.

Can I test firmware for the MAXWELLS0S 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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