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Lemon pcb wireless

rianadon·Cosmos-Keyboard-PCBs·lemon-wireless-uc/lemon-pcb-wireless.kicad_pcb

Lemon pcb wireless layout, top view — open source Nordic nRF board by rianadon
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About the Lemon pcb wireless

Lemon pcb wireless is an open source Nordic nRF PCB design by rianadon, published on GitHub. It is a 4-layer board measuring 29.9 × 42 mm, with 36 components from 25 distinct parts.

Its main chip is the XCVR_MS88SF2, from the Nordic nRF family. Other key parts include the 74HC595, BQ24075RGT, XC6206PxxxMR-Regulator_Linear and TXS0102DQE. By type, the board carries 10 resistors, 7 capacitors, 5 ICs, 5 diodes, 3 connectors and 2 switches.

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

From the project

Open-Source keyboard PCB designs for the Cosmos Keyboard Generator

GPIO and SPI & I2C should be fully VIK-compatible. RGB can be used on one of the flex PCB connector, through-hole pad, or VIK module, but not multiple at the same time. This is a limitation of the flex PCB not having an RGB return pin. If you are using RGB through the VIK connector, solder the "RGB->VIK" jumper.

When connected to USB, 5V on the VIK connector will be 5V. However, it will be equal to battery voltage when operating off battery power (3.3-4.2V).

Lemon pcb wireless, from the project README
From the project README

Main components on the Lemon pcb wireless

74HC595BQ24075RGTXC6206PxxxMR-Regulator_LinearTXS0102DQE

Lemon pcb wireless bill of materials (BOM)

36 components, 25 distinct parts.

QtyPartRefs
1
74HC595
U1
1
BQ24075RGT
U2
1
~
U3
1
XC6206PxxxMR-Regulator_Linear
U4
1
TXS0102DQE
U5
1
Q_PMOS_SGD
Q2
1
USB_C_Receptacle_USB2.0
J1
1
Conn_01x02
J2
1
Programmer
J4
1
Fingers
FPC1
1
Thumbs
FPC2
1
SW_SPDT_312
SW1
1
SW_Push
SW2
1
VIK Conn
VIK1
1
WS2812B-2020
D1
2
LED_Small
D2, D5
2
ESD
D3, D4
1
1uF
C1
2
10uF
C2, C3
2
100nF
C4, C5
Show 5 more
QtyPartRefs
2
1uF
C16, C17
2
100k
R1, R9
2
10k
R2, R5
2
5k1
R3, R4
4
1k
R6, R7, R8, R16

Lemon pcb wireless design files

The KiCad project lives in the rianadon/Cosmos-Keyboard-PCBs repository on GitHub; these links point at the commit this page was built from.

Lemon pcb wireless: common questions

What microcontroller does the Lemon pcb wireless use?

The Lemon pcb wireless is built around the XCVR_MS88SF2, from the Nordic nRF family.

How big is the Lemon pcb wireless?

The Lemon pcb wireless measures 29.9 × 42 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Lemon pcb wireless?

36 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Lemon pcb wireless design files?

From the rianadon/Cosmos-Keyboard-PCBs repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Lemon pcb wireless design in my own project?

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

Can I test firmware for the Lemon pcb wireless 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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