Posts Tagged ‘onahill’

piBot – bot for monitoring temperature

This is a long due project using a raspberry Pi to monitor the temperature of a cabin I’ve been building for a very long time. I’ve bought the hardware almost 4 years ago and only arrived to the point where I could use it.

Motivation

Beside the geek motivation the main practical motivation is to measure inside and outside temperature in order to estimate:

  • degree of insulation and week points
  • min temperature in order to calculate needed anti-freeze mix for heating pipes
  • temperature monitoring for pump automation (TODO)
  • min temperature in order to start some electric heating (TODO)
  • accuracy of weather predictions for the location

Architecture

The architecture of the system is quite simple and has the following components:

    • the raspberry PI, model B which uses several DS18B20 sensors to monitor temperature
    • the piBot (this project) which is basicaly a main loop with sensors and output plugins
  • the vpn client over 3G in order to ensure connectivity in the lack of a fixed ip
  • the vpn server and db where data is stored
  • the visualisation which uses Grafana with a pgsql backend

piBot

PiBot is a python main loop which has a plugin mechanism for sensors and outputs (check it on gitHub). Currently I implemented:

  • sensor: ds18b20 which reads /sys/bus/w1/devices/%s/w1_slave data (sensor integration is present in the raspbian)
  • sensor: /sys/class/thermal/*/temp temperature for CPU temperature
  • output: csv plain output
  • pgsql: postgresql output in grafana friendly format

Grafana output

piBot grafana output