HardLabs

Unkey

natecermak·unkey·pcb/unkey.kicad_pcb

Unkey PCB layout, top view — open source NXP board by natecermak
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About the Unkey PCB

Unkey is an open source NXP PCB design by natecermak, published on GitHub. It is a 4-layer board measuring 67 × 82.1 mm, with 139 components from 39 distinct parts.

Its main chip is the TEENSY 4.0 (HEADERS), from the NXP family. Other key parts include the AH1912-W-7, AH1921-W-7, SN74LV165ARGYR, MYRBP500080B21RE and 2342-05-000. By type, the board carries 74 ICs, 31 capacitors, 18 resistors, 11 connectors and 3 diodes.

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

From the project

Swimmie-Textie

Underwater environments (a) add a lot of noise and (b) distort signals due to reflections.

Here, we use a FM/AM/OFDM scheme to send bits.

Users typically prefer some tactile feedback when they hit a key, and this system doesn't naturally provide that. As such, we experimented with adding a soft (low coercivity) magnetic material (1-2mm mild steel ball bearings) above the Hall-effect sensor, to provide a small pull-in magnetic force when the stylus is brought close to the key. This provides tacticle sensation to the user that they have actually touched a key. It's essential that this…

Main components on the Unkey

AH1912-W-7AH1921-W-7SN74LV165ARGYRMYRBP500080B21RE2342-05-000TLV9062IDRADG728BRUZ-REEL7MCP48CVD21T-E/MFTLV9062XDXC6210B332MR-GADA4098-1BUJZ-RL7CPC1002NTEENSY 4.0 (HEADERS)MCP73833T-AMI/MF

Unkey bill of materials (BOM)

139 components, 39 distinct parts — part numbers from the project's BOM.

QtyPartRefs
51
AH1912-W-7
AH1912-W
U1, U2, U3, U4, U5, U6, U7, U8 +43
4
AH1921-W-7
U45, U68, U69, U70
7
SN74LV165ARGYR
U53, U54, U55, U56, U57, U58, U59
1
MYRBP500080B21RE
U60
1
2342-05-000
U61
1
TLV9062IDR
TLV9062xD
U62
1
ADG728BRUZ-REEL7
ADG728
U63
1
MCP48CVD21T-E/MF
MCP48CVD21
U64
1
TLV9062XD
TLV9062xD
U65
1
XC6210B332MR-G
XC6210B332MR
U66
1
ADA4098-1BUJZ-RL7
ADA4098
U67
2
CPC1002N
U71, U73
1
TEENSY 4.0 (HEADERS)
Teensy4.0
U76
1
MCP73833T-AMI/MF
MCP73833
U80
8
CONN_01X02_PIN
Conn_01x02_Pin
J1, J4, J7, J8, J11, J12, J13, J14
2
CONN_01X05_PIN
Conn_01x05_Pin
J2, J3
1
FH12A-40S-0.5SH(55)
Conn_01x40_Pin
J6
1
PDSE1-S3-D24-M
PS1
1
NCU15XH103F6SRC
10k
TH1
3
754-1116-1-ND
LED
D65, D66, D67
Show 19 more
QtyPartRefs
16
CL05A104KA5NNNC
0.1u
C1, C2, C3, C4, C5, C6, C7, C10 +8
7
C1005X5R1V225K050BC
2.2u
C8, C9, C21, C25, C28, C29, C32
1
CL05A104KA5NNNC
33n
C12
1
CL05A104KA5NNNC
10n
C13
1
CL05A104KA5NNNC
3.3n
C14
1
CL05A104KA5NNNC
1n
C15
1
CL05A104KA5NNNC
330p
C16
1
CL05A104KA5NNNC
100p
C17
1
CL05A104KA5NNNC
33p
C18
1
CL05A104KA5NNNC
10p
C19
2
100
R1, R79
6
1k
R2, R3, R9, R81, R82, R84
1
0
R4
1
HMC0402JT100M
100M
R5
2
500
R6, R80
1
18K
18k
R10
2
10K
10k
R11, R68
2
100K
100k
R76, R78
1
2k
R83

Unkey design files

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

Unkey: common questions

What microcontroller does the Unkey use?

The Unkey is built around the TEENSY 4.0 (HEADERS), from the NXP family.

How big is the Unkey PCB?

The Unkey measures 67 × 82.1 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Unkey?

139 components, from 39 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 Unkey design files?

From the natecermak/unkey 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 Unkey design in my own project?

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

Can I test firmware for the Unkey without the hardware?

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

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