Why you should use HomeIO?03 Mar 2016
- Low hardware requirements
- Fast access to measurements
- “Everything in backend” philosophy
- Web frontend - just run it
- NCurses console interface
- It’s free - GPL licence
Low hardware requirements
There are some requirements your computer need to meet:
- it has run on GNU/Linux or *Nix
- it has to be connected to HomeIO hardware, for example: Arduino
Wind turbine instance utilizes only 15% of Raspberry Pi CPU when not performing store/restore of a whole measreuments buffer.
Imagine that it gets 10 types of measurements, all every about 150ms and do lot of processing.
Fast access to measurements
There is measurement buffer which store every fetched raw value of measurement.
Every one raw value is only
unsigned int in already allocated
std::vector. There is no time
information per value, rather it use interval. Small time inaccuracy is acceptable.
The memory usage is the most efficient as possible. Just plain raw values in RAM.
That means if you want to see a graph there is no IO operation.
Measurements are archivized in CSV file in format:
name; time_from_miliseconds; time_to_miliseconds; value_as_float
It will be easily processable in future, but in my experience you will rarely want to do it.
“Everything in backend” philosophy
Everything what you need to set up is in the
Just one file! Run it and frontend will fetch everything needed.
The only exceptions are:
- addons - which you can write own from scratch
- frontend password to execute actions - double hashed string using md5
Web frontend - just run it
Just run frontend application, setup your router and you can see what your system is doing.
Just like backend, the frontend was also designed to be resource friendly. Frontend acts like a proxy between web browser and backend. Everything is generated in backend, and send as a JSON to web browser.
All processing to render graph is performed in client space. Graphs are rendered using flot.
As you can see above theese requests needed to render graph were served in less than 50ms on Raspberry Pi B!
Keep in mind if our frontend is not what you need feel free to write your own.
NCurses console interface
If you not want to run frontend backend allow you to see what backend is doing, you can use simple console interface.
It’s free - GPL licence
If you want and know how to feel free to use HomeIO for free.