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sensorNet

Arduino powered temperature and humidity sensors that report values to a Raspberry Pi using NRF2401+ modules.
The master node (Raspberry Pi) receives the readings and stores them in a sqlite database.

Heavily inspired by http://blog.the-jedi.co.uk/2014/05/08/rf24network/

sensorMasterPi

  • rfweather_net.cpp: Runs as a daemon and listens on its own NRFL2401+ module for network activity from the sensor nodes. Stores every reading in a temporary file for now (TODO: directly write to the sqlite database)
    Download and compile the RPi parts from https://github.com/TMRh20/RF24 and https://github.com/TMRh20/RF24Network
    Compile on the Raspberry Pi with: g++ -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -L/usr/local/lib -I/usr/local/include -lrf24-bcm -lrf24network ./rf24weather_net.cpp -o rf24weather_net

  • rf24weather.py: Picks up new readings from the daemon and adds them to the sqlite database.

sensorNode

The sensor node reads the temperature and humidity every 30 minutes and goes into power save mode in between. Also the clock frequency is slowed to 1 MHz (from usually 16), except for when we read sensor data.