HardLabs

Halo

wyolum·halo·kicad_v3/halo.kicad_pcb

Halo PCB layout, top view — open source AVR/Arduino board by wyolum

About the Halo PCB

Halo is an open source AVR/Arduino PCB design by wyolum, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 243.8 × 66.3 mm, with 152 components from 32 distinct parts.

Its main chip is the C14877, from the AVR/Arduino family. Other key parts include the C6187 and C6186. By type, the board carries 68 diodes, 30 capacitors, 15 resistors, 11 connectors, 3 ICs and 2 switches.

From the project

Desktop Edge-lit portrait stand.

Halo, from the project README
From the project README

Main components on the Halo

C14877C6187C6186

Halo bill of materials (BOM)

152 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C14877
ATMEGA328
U1
1
C6187
LM1117-5.0
U2
1
C6186
LM1117-3.3
U3
1
C83571
2N7002DW-7-F
Q1
1
C13738
16MHz
X1
1
EJ501A
12V_DC
J1
1
2073-USB4110-GF-A-1
USB4110-GF-A
J2
1
839-54-00164
12V_DC
J3
1
1849-PM20204VBNN
LED_IN
P1
1
609-10129380-906002ALF
FTDI
P2
1
SPI
P3
1
1849-PM20204VBNN
LED_OUT
P4
1
609-10129380-906002ALF
qwiic
P5
1
952-3262
USB_header
P6
1
609-54201-S08-05ALF
generic
P7
1
1849-PM20204VBNN
AUX_DC_OUT
P8
21
I_O
B1, B2, B3, B4, B5, B6, B7, B8 +13
1
C273519
RST
SW1
1
952-3254
MODE
SW2
64
WS2812B
D1, D2, D3, D4, D5, D6, D7, D8 +56
Show 12 more
QtyPartRefs
2
C8165
MBRS240LT3G
D33, D34
1
C2296
LED_PWR
D35
1
C2296
LED_BLNK
D36
3
C176666
100uF
C1, C7, C27
22
C49678
100nF
C2, C9, C10, C11, C12, C13, C14, C15 +14
3
C28323
1uF
C3, C4, C8
2
C1798
20pF
C5, C6
8
C17414
10k
R1, R2, R3, R4, R12, R13, R14, R15
2
C46039
5k11
R5, R6
2
C17513
1k
R7, R8
2
C17557
220E
R9, R10
1
0E
R11

Halo design files

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

Halo: common questions

What microcontroller does the Halo use?

The Halo is built around the C14877, from the AVR/Arduino family.

How big is the Halo PCB?

The Halo measures 243.8 × 66.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Halo?

152 components, from 32 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 Halo design files?

From the wyolum/halo repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Halo design in my own project?

Yes, under the terms of its Apache-2.0 license, which wyolum chose for the repository.

Can I test firmware for the Halo without the hardware?

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

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