2 layers100 × 100 mm
Mist1010
UzixLS/mist1010-board
10x10cm PCB variant of MIST FPGA project for G738/G706 enclosure
273 parts43MIT
2 layers
Tiny sao
urish/ctf-shittyaddon11Capture The Flag Shitty Addon
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 5
- Nets
- 9
- Pads
- 18
- Tracks, vias
- 35, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 27 Aug 2019
- Updated
- 2 Nov 2019
Overview
Tiny sao is an open-source printed circuit board by urish, from the urish/ctf-shittyaddon repository on GitHub, published under the MIT licence. It is a 2-layer board with 5 parts on 9 nets, routed with 35 tracks and 0 vias.
It is built around the ATTINY45-20SU. Its parts include 1 resistor, 1 IC, 1 diode, 1 connector and 1 switch. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdMinimal Shitty Add-On with Capture The Flag Challenge
Copyright (C) 2019, Uri Shaked. Released under the MIT license.
Learn more in the blog post: Capture The Flag Shitty Add-On
Hardware
The ctf-shittyaddon board includes the following hardware:
- ATtiny85 Processor
- A ShittyAddon V1 connector
- Reset button
- Red LED connected to ATtiny85's pin 6 (PB1)
You can also hack a simplified version on a breadboard:
Firmware
Compile the firmware using the Arduino IDE:
- Install ATTiny Core
- Install the TinyWire Library
- Configure Arduino IDE as follows:
- Board: ATtiny25/45/85
- Processor: ATtiny85
- Clock: Internal 8 MHz
- Set the fuses of the chip to enable self programming (
SELFPRGEN=1). This can be done usingavrdude:bash avrdude -pattiny85 -cusbtiny -e -Uefuse:w:0xfe:m -Uhfuse:w:0xdf:m -Ulfuse:w:0xe2:m
When building your own firmware, replace SECRET in the string "$FLAG:SECRET"
with your secret value (the flag).
The Challenge
The firmware code implements an I2C slave listening on address 0x23.
The challenge consists of several milestones of increasing difficulty:
- Make the red LED light
- Find the secret flag value (it starts with the string "$FLAG:")
- Make the red LED blink by executing code directly on the ATTiny85
- Replace the secret flag with a new value without bricking the board
All the above milestones can be achieved through I2C communication with the chip.
For more information, check out the blog post
Parts
5| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | ATtiny45-20SU | Package_SO:SOIJ-8_5.3x5.3mm_P1.27mm | U1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | Male_02x02 | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J1 |
| 1 | R | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | SW_Push | switches:TACTILE-SWITCH-1101NE | SW1 |
Questions
What parts does the Tiny sao use?
5 parts, built around the ATTINY45-20SU. 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 Tiny sao KiCad files?
From the urish/ctf-shittyaddon repository on GitHub, at the commit this page was made from: the board is pcb/tiny-sao.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tiny sao 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).
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