2 layers30.1 × 53 mm
2 layers25.2 × 36.8 mm
Usb kb
KrzysztofW/microdevt20Microcontroller Development Toolkit
- Size
- 25.2 × 36.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 38
- Pads
- 79
- Tracks, vias
- 112, 1
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 6 Nov 2019
- Updated
- 11 Jun 2025
Overview
Usb kb is an open-source printed circuit board by KrzysztofW, from the KrzysztofW/microdevt repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 25.2 × 36.8 mm with 18 parts on 38 nets, routed with 112 tracks and 1 via.
It is built around the ATMEGA16U2-AU. Its parts include 4 resistors, 3 capacitors, 2 connectors, 1 IC and 1 diode. It belongs with the computers and single-board computers boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.rstUpstream Author: Krzysztof Witek
Copyright: Copyright (c) 2017 Krzysztof Witek
License: GPL-2
Overview
Microdevt is a microcontroller development toolkit for quickly developing embedded applications. The toolkit provides asynchronous timers, a task scheduler and a zero-copy, event-based TCP/IP stack. The asynchronous approach of developing Microdevt applications allows to benefit as much as possible of the precious and very limited resources of microcontrollers. It is distributed freely under the GPL-2 open source license and is designed for reliability and ease of use.
For more details see complete documentation in `docs' folder.
Supported Devices
If you don't see a match of your microcontroller, keep in mind that it's easy to port Microdevt code to other microcontrollers.
- Atmel AVR familly (Atmega 328P, Attiny85, Atmega2561 and many others)
- Simulavr
- X86 (for testing purposes)
TCP/IP protocols
- Ethernet
- ARP
- IP
- ICMP
- TCP (basic support with retransmissions, no window support yet)
- UDP
- DNS
Wireless Radio Frequency
- Swen level 2 (Data Link Layer)
- Swen level 3 (Network Layer)
The Swen protocols rely on the robust RF driver (/drivers/rf.c) that uses the pulse width modulated encoding to send & receive data.
The Swen L3 protocol is a unicast connection-oriented protocol and it has been designed to be reliable and secure (uses xtea encription). It is reliable as it notifies the user application whether or not the delivery of data to the recipient was successful. It retransmits lost data, detects data corruptions and uses acknowledgments.
The Swen L2 protocol can be used to send & receive unacknowledged data but also it can record and replay generic commands from widely used 433Mhz remote controls and gadgets.
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | C | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C1, C2 |
| 2 | R 22 | Resistor_SMD:R_0201_0603Metric | R2, R3 |
| 2 | R10k | Resistor_SMD:R_0201_0603Metric | R1, R5 |
| 1 | ATmega16U2-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U1 |
| 1 | C 1uF | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C3 |
| 1 | Conn_01x02_Male External GND SRC | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | External-GND-OUT1 |
| 1 | Conn_01x04_Male SYN 480R | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | Crystal | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | MISO | Connector_PinHeader_1.00mm:PinHeader_1x01_P1.00mm_Vertical | MISO1 |
| 1 | MOSI | Connector_PinHeader_1.00mm:PinHeader_1x01_P1.00mm_Vertical | MOSI1 |
| 1 | Q_NPN_BCE | Package_TO_SOT_THT:TO-92 | Q2 |
| 1 | RST | Connector_PinHeader_1.00mm:PinHeader_1x01_P1.00mm_Vertical | RST1 |
| 1 | SCK | Connector_PinHeader_1.00mm:PinHeader_1x01_P1.00mm_Vertical | SCK1 |
| 1 | USB_A | Connector_USB:USB_A_CNCTech_1001-011-01101_Horizontal | J2 |
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Questions
How big is the Usb kb PCB?
It measures 25.2 × 36.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Usb kb use?
18 parts, built around the ATMEGA16U2-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 Usb kb KiCad files?
From the KrzysztofW/microdevt repository on GitHub, at the commit this page was made from: the board is apps/kbd-usb/kicad/usb_kb.kicad_pcb and its schematic apps/kbd-usb/kbd-usb-remote-ctl/kicad/usb_kb_transmitter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Usb kb design in my own project?
Its repository publishes it under the GPL-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).