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Docimeter

georges-mars·Docimeter

Docimeter PCB layout, top view — open source RP2040/RP2350 board by georges-mars

About the Docimeter PCB

Docimeter is an open source RP2040/RP2350 PCB design by georges-mars, published on GitHub. It is a 4-layer board measuring 35.7 × 35.7 mm, with 133 components from 67 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the LM4040AIM3-3.0+T, BQ21040DBVR, TPS63805YFFR, OPA357AIDBVR and W25Q16JVUXIQ. By type, the board carries 49 resistors, 42 capacitors, 13 ICs, 9 diodes, 6 transistors and 5 inductors.

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

From the project

A wearable redesign of the OpenDosimeter platform focused on compact electronics, custom PCB integration, embedded firmware, and practical radiation-monitoring applications.

A wearable redesign of the OpenDosimeter platform focused on compact electronics, custom PCB integration, embedded firmware, and practical radiation-monitoring applications.

The Wearable OpenDosimeter is a redesigned and wearable implementation of the OpenDosimeter concept. The project takes the original open-source dosimeter architecture and re-engineers it around a compact, portable form factor intended to be worn by the user.

Main components on the Docimeter

LM4040AIM3-3.0+TBQ21040DBVRTPS63805YFFROPA357AIDBVRW25Q16JVUXIQTPS7B6950DBVRMICROFC-60035-SMT-TR1TLV3201AIDCKRRP2040MAX5026EUT+T

Docimeter bill of materials (BOM)

133 components, 67 distinct parts.

QtyPartRefs
2
LM4040AIM3-3.0+T
U1, U6
1
BQ21040DBVR
U2
1
TPS63805YFFR
U3
3
OPA357AIDBVR
U4, U7, U9
1
W25Q16JVUXIQ
U5
1
TPS7B6950DBVR
U8
1
MICROFC-60035-SMT-TR1
U10
1
TLV3201AIDCKR
U11
1
RP2040
U12
1
MAX5026EUT+T
U13
1
DMG2305UX-13
Q1
2
MMBT5088LT1G
Q2, Q4
1
DMG1012T
Q3
2
2N7002
Q5, Q6
1
XL2EL89CMI-111YLC-12M
Y1
1
HC-PH-2AWT
CN1
1
Conn_01x04_Pin
J4
1
SMD-7525-3627-16Ω
BUZZER1
1
06D0750D
F1
1
SW_Push
SW1
Show 47 more
QtyPartRefs
1
SW_Push
SW2
1
SK-3296S-01-L3
SW3
1
TYPE-C 16PIN 2MD(073)
USB1
1
MBR1020VL
D1
2
BAT54S
D2, D3
4
LED
D4, D5, D6, D7
1
PMEG4010BEA,115
D8
1
PMEG4010CEH
D9
3
1k
FB1, FB2, FB3
1
XFL4015-471MEC
L1
1
47u
L2
4
10u
C1, C7, C9, C10
3
2.2u
C2, C16, C21
2
22u
C3, C11
16
100n
C4, C6, C13, C20, C22, C23, C24, C25 +8
3
2.2u
C5, C32, C36
4
10u
C8, C14, C41, C42
1
100n
C12
2
10p
C15, C18
1
1n
C17
1
470p
C19
2
47u
C30, C31
3
4.7u
C38, C39, C40
3
210k
R1, R5, R48
2
499k
R2, R3
11
1k
R4, R12, R13, R15, R16, R25, R34, R42 +3
1
200
R6
1
1
R7
2
10k
R8, R50
1
511k
R9
1
91k
R10
3
100
R11, R27, R47
2
100k
R14, R29
2
1.8k
R17, R18
2
1k
R19, R20
1
47k
R21
2
5.1k
R23, R24
1
24k
R26
1
200k
R28
1
NTCS0603E3103FLT
R30
1
10k
R31
2
49.9k
R32, R33
3
2K
R35, R36, R37
2
49.9
R38, R39
2
27
R40, R41
1
5.6k
R45
1
22k
R49

Docimeter design files

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

Docimeter: common questions

What microcontroller does the Docimeter use?

The Docimeter is built around the RP2040, from the RP2040/RP2350 family.

How big is the Docimeter PCB?

The Docimeter measures 35.7 × 35.7 mm, has 4 copper layers and is 1.5842 mm thick.

How many components are on the Docimeter?

133 components, from 67 distinct parts. The full bill of materials is listed on this page.

Where can I download the Docimeter design files?

From the georges-mars/Docimeter repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Docimeter design in my own project?

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

Can I test firmware for the Docimeter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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