HardLabs

OpenGammaKit

vikulin·OpenGammaKit

OpenGammaKit PCB layout, top view — open source RP2040/RP2350 board by vikulin
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About the OpenGammaKit PCB

OpenGammaKit is an open source RP2040/RP2350 PCB design by vikulin, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 93.5 × 36.5 mm, with 67 components from 27 distinct parts.

Its main chip is the Pico 2, from the RP2040/RP2350 family. Other key parts include the OPA357AIDBVR, TLV3201AIDBVR, LM4040AIM3-3.0+T, MAX5026EUT_T and TPS7B6950DBVR. By type, the board carries 22 capacitors, 21 resistors, 10 ICs, 4 diodes, 4 inductors and 3 transistors.

It belongs with the science & space and test & measurement designs in this gallery.

From the project

☢️ KiCad DIY Kit for gamma-ray spectrometer using a popular NaI(Tl) scintillator, SiPM and Raspberry Pi Pico 2.

OpenGammaKit is an open-source gamma spectrometer hardware platform, inspired by the excellent Open-Gamma-Detector. It takes the original schematic and redesigns the PCB using KiCad (originally designed in EasyEDA), making the project more accessible and modifiable for open hardware enthusiasts.

OpenGammaKit is designed to be affordable, reliable, and easy to integrate with embedded systems, mobile devices, or PCs—ideal for DIY nuclear instrumentation, educational labs, or citizen science.

OpenGammaKit, from the project README
From the project README

Main components on the OpenGammaKit

Pico 2OPA357AIDBVRTLV3201AIDBVRLM4040AIM3-3.0+TMAX5026EUT_TTPS7B6950DBVRMICROFC-60035-SMT-TR1

OpenGammaKit bill of materials (BOM)

67 components, 27 distinct parts.

QtyPartRefs
1
Pico 2
U1
3
OPA357AIDBVR
U2, U4, U5
1
TLV3201AIDBVR
U3
2
LM4040AIM3-3.0+T
U6, U7
1
MAX5026EUT_T
U8
1
TPS7B6950DBVR
U9
1
MICROFC-60035-SMT-TR1
U10
1
2N7002
Q1
2
MMBT5088LT1G
Q3, Q4
1
Thermistor_PTC
TH1
2
50k
VR1, VR2
2
BAT54S
D1, D3
1
LTST-C190KGKT
D2
1
PMEG4010BEA
D5
3
BLM18KG102SN1D
FB1, FB2, FB3
1
47uH
L1
6
22uF
C1, C2, C4, C9, C11, C18
9
100n
C3, C5, C6, C7, C10, C16, C20, C21 +1
1
470p
C8
4
4.7u
C12, C13, C14, C15
Show 7 more
QtyPartRefs
2
2.2u
C17, C19
5
210k
R1, R3, R7, R9, R15
6
1k
R2, R4, R6, R8, R12, R13
3
100R
R5, R10, R16
2
10k
R11, R14
3
49.9k
R17, R18, R19
2
49.9R
R20, R21

OpenGammaKit design files

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

OpenGammaKit: common questions

What microcontroller does the OpenGammaKit use?

The OpenGammaKit is built around the Pico 2, from the RP2040/RP2350 family.

How big is the OpenGammaKit PCB?

The OpenGammaKit measures 93.5 × 36.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OpenGammaKit?

67 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the OpenGammaKit design files?

From the vikulin/OpenGammaKit repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the OpenGammaKit design in my own project?

Yes, under the terms of its GPL-3.0 license, which vikulin chose for the repository.

Can I test firmware for the OpenGammaKit 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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