4 layers413.7 × 121 mm Wren, the printed circuit board in 3D

Wren

This keyboard is a wireless Alice-like keyboard layout made of two PCBs using ESP32 C3 supermini's they can be used separately or together in one case.

Open in PCBKit

Size: 413.7 × 121 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 350
Nets: 203
Pads: 1,106
Tracks, vias: 2,124, 226
Pours: 4
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 25 Nov 2025
Updated: 30 Nov 2025

Overview

Wren is an open-source printed circuit board by Jyst7, from the Jyst7/Wren repository on GitHub, published under the MIT licence. It is a 4-layer board of 413.7 × 121 mm with 350 parts on 203 nets, routed with 2,124 tracks and 226 vias.

It is built around the SK6812MINI-E and SS310. Its parts include 146 diodes, 78 capacitors, 70 switches, 14 resistors and 14 connectors. It belongs with the keyboards and input boards and the ESP32 and RISC-V boards of this library.

Main components

README

README.md

Wren Keyboard

This keyboard is a wireless Alice-like keyboard layout made of two PCBs using ESP32 C3 supermini's they can be used separately or together in one case.

Bill of Materials

Quantity	Component Description	Price (Total)	Links (LCSC Part #)
100x	2M Resistor	$3	https://www.aliexpress.com/item/1005004188603967.html?
100x	806k Resistor	$3	https://www.aliexpress.com/item/1005010109074513.html?
100x	SK6812MINI-E	$7	https://www.aliexpress.com/item/1005005193716172.html?
100x	1N4148W	$0.60	https://www.lcsc.com/product-detail/C917030.html?s_z=n_1N4148W (C917030)
100x	100nf capacitor	$0.50	https://www.lcsc.com/product-detail/C49678.html?s_z=n_C49678 (C49678)
110x	TTC Neptune Venus Switches	$32	https://www.aliexpress.com/item/1005008530751842.html?
2x	Seeed Studio XIAO nRF52840 Plus	$20	https://www.aliexpress.com/item/1005008326858009.html?
1x	Keycap set	$18	https://www.aliexpress.com/item/1005005799670413.html?
2x	103450 3.7V 2000mAh Battery	$15	https://www.aliexpress.com/item/1005008129110763.html?
NA	PCB	$102	NA

Overall Order Total

Overall	Price Breakdown	Price (Total)
Components	Sum of all minimum order prices	$$200

CAD PNG image 3 PCB Screenshot 2025-11-29 at 3 50 53 PM Schematic Screenshot 2025-11-29 at 3 51 22 PM

Parts

350

Qty	Value	Footprint	References
70	C	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 +54
70	D	Diode_SMD:D_1206_3216Metric	D1, D10, D11, D12, D13, D14, D15, D16, D17, D18, D100, D101, D102, D103, D104, D105 +54
70	SK6812MINI	Cheyao Macropad PCB Neopixel:SK6812MINI-E	D106, D107, D108, D109, D110, D111, D112, D113, D114, D115, D116, D117, D118, D119, D120, D121 +54
70	SW_Push	Switch_Keyboard_Cherry_MX:SW_Cherry_MX_PCB_1.00u	SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +54
14	MountingHole	MountingHole:MountingHole_3.2mm_M3	H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14
6	1k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R2, R4, R6, R9, R11, R13
6	~	FS8205 Model by Fortune Semiconductor:SOT95P280X145-6N	Q1, Q2, U3, U4, U6, U7
4	22uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C71, C72, C75, C76
4	2k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R5, R7, R12, R14
4	Conn_01x01_Socket	TestPoint:TestPoint_Loop_D3.80mm_Drill2.0mm	J1, J2, J3, J4
4	LED_Small	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	D142, D143, D145, D146
2	0.1u	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C74, C78
2	100	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R3, R10
2	10u	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C73, C77
2	22uH	Assets:SMRH74-220MT	L1, L2
2	5V	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	J5, J10
2	7.5k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R8
2	ESP32-C3_SUPERMINI_TH	ESP32-C3 SuperMini TH:MODULE_ESP32-C3_SUPERMINI	U1, U2
2	SS310	Diode_SMD:D_3220_8050Metric_Pad2.65x5.15mm_HandSolder	D141, D144
2	TestPoint_2Pole	TestPoint:TestPoint_2Pads_Pitch2.54mm_Drill0.8mm	TP1, TP2
2	USB_C_Receptacle_PowerOnly_6P	Connector_USB:USB_C_Receptacle_GCT_USB4125-xx-x_6P_TopMnt_Horizontal	J8, J13
2	bat+	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	J7, J12
2	bat-	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	J9, J14
2	gnd	TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm	J6, J11
2	~	TP4056 Model by Texas Instruments:SOP127P600X175-9N	U5, U8

Questions

How big is the Wren PCB?

It measures 413.7 × 121 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Wren use?

350 parts, built around the SK6812MINI-E and SS310. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Wren KiCad files?

From the Jyst7/Wren repository on GitHub, at the commit this page was made from: the board is Wren/Wren.kicad_pcb and its schematic Production/Wren.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Wren design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Keyboards and input ESP32 RISC-V

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/jyst7-wren" title="Wren in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/jyst7-wren.jpg" alt="Wren" width="1200" height="900">

A picture that opens the board, for a README

[![Wren](https://pcbkit.io/embed/boards/jyst7-wren.jpg?size=s)](https://pcbkit.io/boards/jyst7-wren)

Source

Repository: Jyst7/Wren
Board file: Wren/Wren.kicad_pcb
Commit: bce1874
Licence: MIT
Copies: 2 copies in 1 repository

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