Great progress to report.
The CO2 and luminosity sensors are transmitting data from one Feather M0 to another via OPEnS' Nordic transmitter. Data is also saving locally with RTC time stamp to an Adalogger SD card.
- Serial SERCOM was set up to communicate with the CO2 sensor using this sample: https://learn.adafruit.com/using-atsamd21-sercom-to-add-more-spi-i2c-serial-ports/creating-a-new-serial
- A temporary voltage divider circuit was created with resistors to knock the K30's data lines down from 5V to 3.3V for the Feather. A logic level shifter (https://www.sparkfun.com/products/12009) is on its way for the proper setup.
I'll work on getting everything up on the GitHub page including wiring.
More to follow,