temperature-server

A simple (prototype) web server to display temperature readings from wireless sensors

Written with node/express, html/js/jquery/knockout, highstocks (for charts). It should be noted that this is a really old code, but it works. I'll port this to newer frameworks and clean it up... one day...

Prerequisites

• node & npm
• a source stream for temperature and humidity data (sample data included)

How it works

A node script processes input from stdin that contains a stream of readings.
It exposes a web server to show these readings, both current temps and a chart of historical readings (held in memory). The web page polls the server for new readings.

To get it going (with included sample data), first clone this repo then:

cd temperature-server/web
npm install    ## (downloads the required node_modules)
cat sampledata.txt | node tempServer.js    

Then you should be able to open a web browser and point to port 8000, e.g. http://localhost:8000/

The input format is very specific to my application, to use this in your own application, you probably want to hack at or replace the node script

Example data

2016-08-08 00.00.04,1,Batt:ok, Id:1f/1, Temp: 82.1, Hum:84
2016-08-08 00.00.07,2,Batt:ok, Id:f3/4, Temp: 89.0, Hum:48
2016-08-08 00.00.20,3,Batt:ok, Id:99/2, Temp: 76.6, Hum:59
2016-08-08 00.00.29,4,Batt:lo, Id:40/3, Temp: 69.5, Hum:51

CSV columns are: timestamp, sequence number (ignored), battery status ('ok' or 'lo'), sensor id, temperature, humidity.

Configuration:

• the tempServer.js takes an optional argument to specify a different port than 8000
• config.js contains the names for the different sensor ids

My TODO (eventually)

• Replace KO/jquery with angular or something newer
• Use bower or similar for JS dependencies
• Support a proper db; rrdtool or some other time-series database.
• replace the ad-hoc input format with something more standardized
• cosmetic (css) improvements