An air quality measurement board to be used as HAT on top of the Raspberry Pi B+.
It should be easy to use thanks to the on-board labeling of all headers.
It can measure air...
- pressure (via BMP180 module board "GY-68" or compatible)
- and volatile organic compounds (VOC) via four MQ gas sensor slots of your choice
Additionally it can drive WS1812B LEDs...
Level Shifter to run 5V NeoPixels (WS1812B) LEDs via a 3.3V SPI bus (e.g. Raspberry Pi).
The P-SPI header was designed in such a way, that the PCB can be plugged on top of the Raspberry without further cabeling.
The P-LED-DRIVE outputs the signal to the LEDs, while P-LED-SENSE _optionally_ connects to the output of the last LED in the chain.
Connecting P-LED-SENSE allows a software running on the...