home automation with perl
Post on 10-May-2015
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Home automation with Perl
Raspberry Pi, 868MHz, FHEM, Redis, Logstash , Kibana and Elasticsearch
monitoring
The hardware
▪ Raspberry Pi
▪ COC (868MHz)
▪ JeeLink
▪ FS20
▪ Homematic
The software stack
▪ FHEM (perl!)
▪ Redis
▪ Logstash
▪ Elasticsearch
▪ Kibana
What is FHEM
▪ Home automation system
▪ Written in Perl
▪ Badly documented (mostly German)
▪ Great auto-configure functionality
▪ Has web interface and Android app
What is Redis
▪ An advanced in-memory key-value data store.
▪ FAST!!
▪ Durable (configurable disk-write)
▪ Single-threaded
▪ Lots of fancy features (lists, hashes, sets)
▪ Very well documented
▪ Great perl module
▪ Not very scalable… master-slave possible
What is Logstash
▪ A tool for managing events and logs
▪ Primarily an interface - between sources (redis, files, pipes, …) and storage (elasticsearch, mongodb, email, …)
▪ Lots of very helpful filters (date, grok, geoip, …)
▪ Horizontally scalable
▪ Fantastic community “If a newbie has a bad time, it’s a bug”
What is Elasticsearch
▪ Elasticsearch is a search server based on Lucene
▪ Very easy to set up
▪ Very horizontally scalable
▪ Written in Java…
▪ Great RESTful API
▪ Great perl module written by the developers themselves
▪ Needs BIG hardware (500 million events/day: 132GB RAM, 16 cores)
▪ Stability….. :-/
The costs (so far…)
Device Unit cost
Total
RPi + Power + SD card 50 50
COC 868MHz 75 75
JeeLink v3 868MHz 32 32
EM1000 power monitor 34 68
PCA301 remote socket with power monitor 34 34
HMS100TF remote thermometer/hydrometer 25 50
Total 309
Concerns
▪ Security for actuators
▪ Social implications – Big Brother
▪ Catastrophic Corner Cases
Questions…?
Links
▪ FHEM http://fhem.de/fhem.html
▪ Redis http://redis.io/ (The little Redis book)
▪ Logstash http://logstash.net/
▪ Elasticsearch http://www.elasticsearch.org/
▪ ELV Elektronik http://www.elv.de/
▪ Busware http://busware.de/
▪ Raspberry Pi http://www.raspberrypi.org/
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