kmpm/README.md

## README.md

      
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              README.md
            
          
    OWFS on Raspberry PI using i2c

This is based on a default "wheezy" install.
Prepare

First, install all neccesary tools and some good to have ones.
When this was written 2012-01-03 it wasn't neccesary to
compile your own owfs. The one from the repositories work fine.
Install

#good to have debs
sudo apt-get install i2c-tools owfs ow-shell


Configure

     sudo nano /etc/modprobe.d/raspi-blacklist.conf
And make sure you comment out then line blacklist i2c-bcm2708 so that it looks like
#blacklist i2c-bcm2708

Add i2c-dev to the end of /etc/modules file if it's not already listed.
Load the modules manually instead of restarting.
sudo modprobe i2c-bcm2708
sudo modprobe i2c-dev
Edit /etc/owfs.conf and remove any othter server: FAKE... or whatever is default.
Instead add a line with for i2c like below.
#server: FAKE = DS18S20,DS2405

server: i2c = ALL:ALL


Test

If everything is connected as it should a 18 should turn up
when you run i2cdetect -y 0|1 where you use 0 for the first
version of the Raspberry PI board and 1 for the second.
This is because they have moved the GPIO pins from i2c port 0 to
port 1 on the second generation of the boards
pi@raspberrypi ~ $ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Restart the the owfs server service so it rereads the config.
sudo service owserver restart
[ ok ] Restarting 1-Wire TCP Server: owserver.

Try to do list what owfs found. Since I am using a DS2481-800
which has 8 different 1-wire busses it will list these if
everything works. Note, this display does not show any
devices.
pi@raspberrypi ~ $ owdir
/bus.9
/bus.7
/bus.6
/bus.5
/bus.4
/bus.3
/bus.2
/bus.1
/bus.0
/uncached
/settings
/system
/statistics
/structure

Node on the Pi

This is completely up to you but because I use node together with owfs I need this
Install node from precompiled to save LOADS OF TIME
wget http://nodejs.org/dist/v0.10.20/node-v0.10.20-linux-arm-pi.tar.gz

cd /usr/local
sudo tar xzvf ~/node-v0.10.20-linux-arm-pi.tar.gz --strip=1


## server.js
var OwfsClient = require('owfs').Client;
var owfs = new OwfsClient('127.0.0.1', 4304);

var cache = {};
var count=0;
var found=0;

var keylist="";

function refresh() {
        console.log("cache", cache);
        console.log(found);
        console.log(keylist);
        found=0;
        keylist="";
        try{
                owfs.dir('/', function(directories){
                        directories.forEach(refreshDevice);
                });
        }
        catch(err) {
                console.log("owfs error", err);
        }

}


function refreshDevice(path) {
        owfs.read(path + "/temperature", function(result){
                if(typeof(cache[path])==='undefined'){
                        cache[path]={};
                }
                cache[path].temperature=parseFloat(result);
                cache[path].update = new Date();
//              keylist += path + "=" + result + "\n ";
                found++;
        });
}


refresh();
setInterval(refresh, 15000);

var easyip = require('easyip');
var service = new easyip.Service();

function update_easyip(){
        var key,i;
        var sorted=[];
        for(key in cache){
                if(cache.hasOwnProperty(key)){
                        sorted[sorted.length]=key;
                }
        }
        count = sorted.length;
        service.storage.set(easyip.OPERANDS.FLAGWORD, 0, count);
        console.log("count=", count);
        sorted.sort();
        var index=1;
        for(i=0; i<sorted.length; i++){
                var nod = cache[sorted[i]];
                service.storage.set(easyip.OPERANDS.FLAGWORD, index, Math.round(nod.temperature * 100));
                console.log(sorted[i], nod);
                index++;
        }
};

setInterval(update_easyip, 5000);

service.on('cacheening', function(address){
        console.log("easy ip cacheening on", address);
});

service.bind();
	var OwfsClient = require('owfs').Client;
	var owfs = new OwfsClient('127.0.0.1', 4304);

	var cache = {};
	var count=0;
	var found=0;

	var keylist="";

	function refresh() {
	console.log("cache", cache);
	console.log(found);
	console.log(keylist);
	found=0;
	keylist="";
	try{
	owfs.dir('/', function(directories){
	directories.forEach(refreshDevice);
	});
	}
	catch(err) {
	console.log("owfs error", err);
	}

	}


	function refreshDevice(path) {
	owfs.read(path + "/temperature", function(result){
	if(typeof(cache[path])==='undefined'){
	cache[path]={};
	}
	cache[path].temperature=parseFloat(result);
	cache[path].update = new Date();
	// keylist += path + "=" + result + "\n ";
	found++;
	});
	}


	refresh();
	setInterval(refresh, 15000);

	var easyip = require('easyip');
	var service = new easyip.Service();

	function update_easyip(){
	var key,i;
	var sorted=[];
	for(key in cache){
	if(cache.hasOwnProperty(key)){
	sorted[sorted.length]=key;
	}
	}
	count = sorted.length;
	service.storage.set(easyip.OPERANDS.FLAGWORD, 0, count);
	console.log("count=", count);
	sorted.sort();
	var index=1;
	for(i=0; i<sorted.length; i++){
	var nod = cache[sorted[i]];
	service.storage.set(easyip.OPERANDS.FLAGWORD, index, Math.round(nod.temperature * 100));
	console.log(sorted[i], nod);
	index++;
	}
	};

	setInterval(update_easyip, 5000);

	service.on('cacheening', function(address){
	console.log("easy ip cacheening on", address);
	});

	service.bind();