HardLabs

Arc

DynamicWhiteHat·Arc·CAD/PCB/Freedom.kicad_pcb

Arc PCB layout, top view — open source Nordic nRF board by DynamicWhiteHat

About the Arc PCB

Arc is an open source Nordic nRF PCB design by DynamicWhiteHat, published on GitHub. It is a 2-layer board measuring 326.6 × 123.8 mm, with 415 components from 40 distinct parts.

Its main chip is the NRF52840_HOLYIOT_18010, from the Nordic nRF family. Other key parts include the BQ24075RGT, XC6206PXXXMR, MAX17048 and USBLC6-2P6. By type, the board carries 108 capacitors, 100 diodes, 84 LEDs, 18 resistors, 6 connectors and 6 switches.

It belongs with the iot & wireless, keyboards and displays & leds designs in this gallery.

From the project

A Wireless 75% Backlit Keyboard

After designing Corneucopia, I decided that I wanted to create a regular keyboard. I have attempted to make many in the past, but I never got around to finishing them. Now that I had experience making a wireless split, I decided to make a wireless regular. This was also a test of making a PCB with just the MCU. Previously, I have made PCBs with the ESP32 SoM, but this was my first chip PCB that didn't use the ESP32.

Arc, from the project README
From the project README

Main components on the Arc

NRF52840_HOLYIOT_18010BQ24075RGTXC6206PXXXMRMAX17048USBLC6-2P6

Arc bill of materials (BOM)

415 components, 40 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
NRF52840_HOLYIOT_18010
nRF52840_holyiot_18010
U1
1
BQ24075RGT
U3
1
XC6206PXXXMR
XC6206PxxxMR
U4
1
MAX17048
U5
1
USBLC6-2P6
U6
3
2N7002
Q1, Q2, Q3
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J1
1
CONN_01X02_SOCKET
Conn_01x02_Socket
J2
2
A03401A
J3, J5
1
CONN_01X06
Conn_01x06
J4
1
CONN_01X05_PIN
Conn_01x05_Pin
J7
1
C914092
750 mA
F1
71
MX_SW_HS
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +63
1
2
MX29
2
1.5
MX31, MX57
2
1.75
MX32, MX72
2
2.25
MX56, MX60
3
1.25
MX73, MX74, MX75
1
SPACE
MX76
1
MX_stab
S1
Show 20 more
QtyPartRefs
2
MX_stab
S2, S4
1
MX_stab
S3
1
C109335
SW_SPDT
SW1
1
SW_Push
SW2
84
SK6812MINI-E
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +76
1
C151996
D
D1
1
LED
D2
82
1N4148W
D3, D4, D5, D6, D7, D8, D9, D10 +74
16
SK6812
D85, D86, D87, D88, D89, D90, D91, D92 +8
2
BLM15PX121SN1D
L1, L2
103
100NF
100nF
C1, C7, C8, C9, C10, C11, C12, C13 +95
3
4.7UF
4.7uF
C2, C3, C4
2
1UF
1uF
C5, C6
4
5.1K
R1, R2, R13, R14
1
47K
47k
R3
1
1.5K
1.5k
R4
1
3.9K
3.9k
R5
7
10K
10k
R6, R7, R9, R15, R17, R19, R20
3
100R
R8, R16, R18
1
100K
100k
R10

Arc design files

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

Arc: common questions

What microcontroller does the Arc use?

The Arc is built around the NRF52840_HOLYIOT_18010, from the Nordic nRF family.

How big is the Arc PCB?

The Arc measures 326.6 × 123.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Arc?

415 components, from 40 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 Arc design files?

From the DynamicWhiteHat/Arc 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 Arc design in my own project?

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

Can I test firmware for the Arc 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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