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aqhomecontrol/avr/devices/n21
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N21
===

- Role: Door sensor with temp and motion detection
- MCU: AtTiny84
- Connection: RJ45
- Predecessor: N16
- Periphery:
  - PIR sensor (AMN31112)
  - door sensor (TCRT1000)
  - TWI interface
    - SI7021 temperature and humidity sensor