N29
===


N29 is a ATtiny84 based PCB with either a temperature/humidity sensor or
a CO2 sensor. It also contains a motion detector and a Photo-LED/transistor
for light measurement.



Overview
--------


- Role: Air quality and climate sensors
- MCU: AtTiny84
- Connection: RJ45
- COM: COM2W
- Predecessor: N27, N24, N23, N19
- Periphery:
  - PIR sensor (AMN31112)
  - TWI interface
    - SI7021 temperature and humidity sensor
      or
    - SGP-30/40 air quality sensor
  - Photo LED