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Main

hicancan·carbentra-presence-sensor·electronics/main.kicad_pcb

Main PCB layout, top view — open source Nordic nRF board by hicancan

About the Main PCB

Main is an open source Nordic nRF PCB design by hicancan, published on GitHub under the AGPL-3.0 license. It is a 4-layer board measuring 36 × 36 mm, with 24 components from 14 distinct parts.

Its main chip is the MDBT42Q-512KV2, from the Nordic nRF family. Other key parts include the Acconeer XM125 and TPS7A0218PDBVR. By type, the board carries 9 resistors, 8 capacitors, 4 ICs, 2 connectors and 1 transistor.

It belongs with the sensors designs in this gallery.

From the project

CARBENTRA Sense B: wired radar presence sensor, native hardware and authenticated firmware

Open the main / power .kicadpro` projects with KiCad 10.0.5. Schematics, routed boards, rules, local symbol/footprint libraries, BOM, pin maps and mechanical contracts are retained as editable source. These native circuit files are authoritative.

Follow LOCALBUILD.md and scripts/dev.ps1 -Action electronics -BuildRoot `. The coordinator copies source into a fresh external directory, runs strict ERC/DRC, exports native netlists and independently compares PCB pad connections, then produces schematic PDF, Gerbers, Excellon drills and source-faithful presentation sheets. A nonzero rule check…

Main components on the Main

MDBT42Q-512KV2Acconeer XM125TPS7A0218PDBVR

Main bill of materials (BOM)

24 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MDBT42Q-512KV2
U1
1
Acconeer XM125
U2
2
TPS7A0218PDBVR
U4, U5
1
TEMT6000X01
Q2
1
3V3 POWER HARNESS
J1
1
SIDE BUTTON WIRES
J3
3
10U
10u
C1, C2, C3
1
22U
22u
C4
2
100N
100n
C5, C6
2
10N
10n
C8, C9
1
0R
R1
3
1M
R5, R6, R10
3
100K
100k
R7, R8, R9
2
4.7K
4.7k
R11, R12

Main design files

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

Main: common questions

What microcontroller does the Main use?

The Main is built around the MDBT42Q-512KV2, from the Nordic nRF family.

How big is the Main PCB?

The Main measures 36 × 36 mm, has 4 copper layers and is 1 mm thick.

How many components are on the Main?

24 components, from 14 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 Main design files?

From the hicancan/carbentra-presence-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 Main design in my own project?

Yes, under the terms of its AGPL-3.0 license, which hicancan chose for the repository.

Can I test firmware for the Main without the hardware?

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

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