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2026-03-28 21:55:43 +01:00

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# 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
## Schematic
![Schematic](https://gitea.aqbanking.de/martin/aqhcs/raw/branch/master/doc/mcu-examples/n29/n29_schematic.png)
## PCB Front
![PCB Front](https://gitea.aqbanking.de/martin/aqhcs/raw/branch/master/doc/mcu-examples/n29/n29_pcb_front.png)
## PCB Back
![PCB Front](https://gitea.aqbanking.de/martin/aqhcs/raw/branch/master/doc/mcu-examples/n29/n29_pcb_back.png)