2 layers137.8 × 60.1 mm Pisces, the printed circuit board in 3D

Pisces

Pisces - Tiny Split Keyboard

Size: 137.8 × 60.1 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 63
Nets: 61
Pads: 433
Tracks, vias: 595, 69
Pours: 2
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 15 Nov 2020
Updated: 30 Dec 2024

Overview

Pisces is an open-source printed circuit board by knaruo, from the knaruo/pisces repository on GitHub, published under the MIT licence. It is a 2-layer board of 137.8 × 60.1 mm with 63 parts on 61 nets, routed with 595 tracks and 69 vias.

It is built around the ATMEGA32U2-AU. Its parts include 20 diodes, 19 switches, 6 capacitors, 6 resistors and 2 connectors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

ATMEGA32U2-AU
TQFP-32(7x7)-40℃~+85℃ 16MHz 1KB 1KB 2.7V~5.5V 22 32KB 8 Bit AVR Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、External pin reset (NRST)、Built-in general-purpose timer、Programmable watchdog TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontroller Units (MCUs/MPUs/SOCs)

README

README.md

pisces

Pisces - Tiny Split Keyboard

Pisces V1

Concept

Ortholinear
- 3 rows * 6 columns + 1 thumb key, total 38 keys
Key switch hot-swap capable
- Supports Kailh PCB socket for MX
Thin design
- Only supports SMT diodes (1N4148W)

BOM list

Number of components in the following bill of material table is for one hand.

Here are the mandatory items:

Name	Parts id	Number	Note
Diode	1N4148W	19	Availaable from here
ATmega32U2	-	1
TRRS jack	PRT-12639	1	Available from here
TRRS cable	-	1
Reset Switch	TVAF06-A020B-R	1	Available from here

For Cherry MX profile:

Name	Parts id	Number	Note
Socket (MX)	CPG151101S11	19	here
Spacer (M2 7mm)	ARB-2007E	6	here
Thread (M2 3mm)	-	12	here for example..

Category and platform

Keyboards and input AVR (ATmega, ATtiny)

Project files

Show this board on your page

https://pcbkit.io/boards/knaruo/pisces

The board's own page, for a message or a post.

Source

Repository: knaruo/pisces
Board file: pcb/v2/pisces.kicad_pcb
Commit: 54fe47d
Licence: MIT

Parts

Qty	Value	Footprint	References
20	D	pisces_v2:D3_SMD	D1, D2, D3, D4, D5, D6, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19 +4
19	SW_PUSH	pisces_v2:CherryMX_Choc_Hotswap	SW1, SW2, SW3, SW4, SW5, SW6, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19 +3
6	Val**	pisces_v2:HOLE	HOLE1, HOLE2, HOLE7, HOLE8, HOLE13, HOLE14
2	0.1u	Capacitor_SMD:C_0402_1005Metric	C3, C6
2	10k	Resistor_SMD:R_0603_1608Metric	R3, R4
2	22p	Capacitor_SMD:C_0402_1005Metric	C1, C2
2	5.1k	Resistor_SMD:R_0603_1608Metric	R1, R2
2	5.1k	Resistor_SMD:R_0402_1005Metric	R5, R6
1	10u	Capacitor_SMD:C_0805_2012Metric	C4
1	1u	Capacitor_SMD:C_0603_1608Metric	C5
1	ATmega32U2-AU	Package_QFP:TQFP-32_7x7mm_P0.8mm	U1
1	AudioJack4	pisces_v2:Jack_3.5mm_PJ320D_Horizontal_reversible	J2
1	Crystal_GND24_Small	Crystal:Crystal_SMD_SeikoEpson_FA238-4Pin_3.2x2.5mm	Y1
1	Polyfuse_Small	pisces_v2:RESC1206X70N	F1
1	SW_PUSH	pisces_v2:TVAF06-A020B-R_reversible	RSTSW1
1	USB_C	pisces_v2:USB_C_Receptacle_XKB_U262-16XN-4BVC11	J1

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Questions

How big is the Pisces PCB?

It measures 137.8 × 60.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Pisces use?

63 parts, built around the ATMEGA32U2-AU. 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 Pisces KiCad files?

From the knaruo/pisces repository on GitHub, at the commit this page was made from: the board is pcb/v2/pisces.kicad_pcb and its schematic pcb/v2/pisces.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Pisces 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).