Hackaday.io is full of amazing projects, and we’ve noticed a fair number of those projects have purple PCBs! Here are some nifty projects that have shared their boards on OSH Park:
World’s Smallest Bat Detector
There are more bats around than you think!
PICTIL
Remake of the TIL311 hex LED display with recent technology.
Video of the PICTIL in action:
1 Square Inch of Power
An MPPT solar boost converter with 3.3v Output and Supercap energy storage.
Download / Order Power board
Download / Order Solar Panel board
Low Power Continuity Tester
An extremely simple, dependable continuity tester
Tiny CC430 Development Board
A custom CC430F5137 development board with selectable operational frequency between ISM 868 MHz and 915 MHz.
STM32F030F4 IoT Breakout board
This is yet another STM32F030F4 breakout board. There are footprints for nRF24L01+ module, MicroSD.
OSH Park 
Awesome…Purple board goodness right there!
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Look at the SAM 15×15 board. The smallest arduino compatible. 15 x 15 mm. 34 I/O pins.
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