2 layers76 × 56 mm 1231949B, the printed circuit board in 3D

1231949B

01231949/kicad

assignment

Size: 76 × 56 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 60
Nets: 78
Pads: 287
Tracks, vias: 835, 101
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 12 Aug 2026
Updated: 12 Aug 2026

Overview

1231949B is an open-source printed circuit board by 01231949, from the 01231949/kicad repository on GitHub. It is a 2-layer board of 76 × 56 mm with 60 parts on 78 nets, routed with 835 tracks and 101 vias.

It is built around the ATMEGA16U2-MU, ATMEGA328P-PU and LMV358, with the LP2985-33DBV, CD1206-S01575 and FDN340P among its other parts. Its parts include 10 capacitors, 5 ICs, 5 connectors, 4 inductors and 3 resistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

kicad

assignment

Parts

Qty	Value	Footprint	References
7	1K	Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder	RN2B1, RN2C1, RN2D1, RN4A1, RN4B1, RN4C1, RN4D1
4	100n	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C1, C6, C7, C8
3	10K	Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder	RN1A1, RN1B1, RN1D1
3	YELLOW	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	L2, RX1, TX1
2	22R	Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder	RN3A1, RN3D1
2	22p	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C9, C11
2	47u	Capacitor_SMD:CP_Elec_6.3x5.4	PC1, PC2
2	8X1F-H8.5	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	I0L1, POWER1
2	Varistor	Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder	RV2, RV3
1	100N	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C5
1	100n	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C2
1	10K	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	RN1C1
1	10X1F-H8.5	Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical	IOH1
1	16Hz	Crystal:Crystal_HC49-4H_Vertical	Y1
1	1M	Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder	R1
1	1N914	Diode_SMD:D_SOD-123	D2
1	1u	Capacitor_SMD:C_01005_0402Metric	C3
1	6X1F-H8.5	Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical	AD1
1	ATmega16U2-M	Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm	U3
1	ATmega328P-P	Package_DIP:DIP-28_W7.62mm	U4
1	BLM21	Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder	L1
1	Barrel_Jack_MountingPin	Connector_BarrelJack:BarrelJack_Horizontal	J2
1	C	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C4
1	CD1206-S01575	Diode_SMD:D_SOD-123	D3
1	Conn_01x08	Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical	J6
1	Conn_02x02_Odd_Even	Connector_PinSocket_2.54mm:PinSocket_2x02_P2.54mm_Vertical	JP2
1	Conn_02x03_Odd_Even	Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical_SMD	J1
1	Conn_02x03_Odd_Even	Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical	J3
1	FDN340P	Package_TO_SOT_SMD:SOT-23	T1
1	Fuse	Fuse:Fuse_2920_7451Metric	F2
1	GROUND	Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm	GND1
1	LMV358	Package_SO:MSOP-8_3x3mm_P0.65mm	U5
1	LP2985-3.3	Package_TO_SOT_SMD:SOT-23-5	U6
1	M7(1N914)	Diode_SMD:D_SC-80	D1
1	NCP1117-3.3_SOT223	Package_TO_SOT_SMD:SOT-223-3_TabPin2	U2
1	ON	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	GREEN1
1	R	Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder	R2
1	RN2A1	Resistor_SMD:R_0201_0603Metric_Pad0.64x0.40mm_HandSolder	R1K1
1	Resonator_Small	Crystal:Resonator_SMD_Murata_CSTxExxV-3Pin_3.0x1.1mm_HandSoldering	Y2
1	SW_Nidec_CAS-120A1	Button_Switch_SMD:SW_Push_1P1T_NO_CK_PTS125Sx43SMTR	SW1
1	SolderJumper_2_Open	Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm	RESET1
1	USB_B_Mini	Connector_USB:USB_Mini-B_Lumberg_2486_01_Horizontal	J4

Questions

How big is the 1231949B PCB?

It measures 76 × 56 mm and has 2 copper layers, 1.6 mm thick.

What parts does the 1231949B use?

60 parts, built around the ATMEGA16U2-MU, ATMEGA328P-PU, LMV358 and LP2985-33DBV. 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 1231949B KiCad files?

From the 01231949/kicad repository on GitHub, at the commit this page was made from: the board is kicad 01231949b/1231949B.kicad_pcb and its schematic kicad 01231949b/01231949B.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the 1231949B design in my own project?

Its repository states no licence, so its author keeps all rights: ask 01231949 before reusing the design.

Category and platform

AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/01231949-kicad" title="1231949B 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/01231949-kicad.jpg" alt="1231949B" width="1200" height="900">

A picture that opens the board, for a README

[![1231949B](https://pcbkit.io/embed/boards/01231949-kicad.jpg?size=s)](https://pcbkit.io/boards/01231949-kicad)

Source

Repository: 01231949/kicad
Board file: kicad 01231949b/1231949B.kicad_pcb
Commit: 7a688ef
Licence: Not stated
Copies: 3 copies in 3 repositories

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