See my answers below:
Le vendredi 5 février 2016 17:52:01 UTC+1, Przemek Klosowski a écrit :
>
> On Fri, Feb 5, 2016 at 10:34 AM, Jean-Bernard Boichat
> <[email protected] <javascript:>> wrote:
> > The BeagleBone community forum is not too active, sure. It's a pity for
> such
> > a good board and concept.
>
> Are you participating in this discussion by sending email to
> [email protected] <javascript:>, or via some other way? I see it
> as an
> email stream of a dozen or so messages a day. I'd call it pretty
> active.
>
>
I just use http://beagleboard.org/Community/Forums
Something better?
> > I found today one or two good articles like "Is BoneScript more trouble
> than its worth?"
> > I have myself problem every 4-5 days with a Bonescript Web server
> > distributing my sensor data, where I have to add soon a watchdog
>
> Do you require constant running, or do you sleep and run? If the
> latter, you probably should respawn a fresh interpreter each time, do
> the work and quit---otherwise you are at the mercy of memory leaks
> that are hard to avoid in an interpreter.
>
Just this:
#!/bin/bash
> cd /root/nodejs
> while :
> do
> exec sudo node bbbserver.js >/dev/null
> sleep 1
> done
>
Loop in case bbbserver.js crashes
and:
var http = require("http");
> var url = require('url');
> var fs = require('fs');
> var io = require('/usr/local/lib/node_modules/socket.io');
> var b = require('/usr/local/lib/node_modules/bonescript');
> //Lets define a port on 192.168.1.61 where we want to listen to
> const PORT=8001;
> //console.log("Server listening on port %s", PORT);
> var server = http.createServer(function(request, response) {
> var path = url.parse(request.url).pathname;
> switch(path){
> case '/':
> ......
> break;
> case '/lightsync':
> response.writeHead(200, {'Content-Type': 'text/plain'});
> var reading = b.analogRead('P9_40'); //Synchronous light value
> (< 1.0 Volt))
> value = (10000 - ((1.0 - (reading*reading*reading)) * 10000)) | 0
> response.write('' + value); //string conversion
> response.end();
> break;
> case '/fixed.html':
> ....
> break;
> default:
> response.writeHead(404);
> response.write("opps this doesn't exist - 404");
> response.end();
> break;
> }
> });
> server.listen(PORT);
> var value = 9999
> var listener = io.listen(server);
> listener.sockets.on('connection', function(socket) {
> b.analogRead('P9_40', computeValue);
>
> socket.emit('message', {'message': value});
> });
> function computeValue(x) {
> reading = x.value
> value = (10000 - ((1.0 - (reading*reading*reading)) * 10000)) | 0
> }
The value calculation allows to react more at middle range of light (sensor
outside).
My Raspberry calls this BBB Webserver during 2 periods erlay in the morning
and the evening up to a predefined time like 23:30 in a config file (not in
the night for instance).
My Raspberry computes the sunrise and sunset depending of the seasons, and
of some predefined time, will switch on or off the lights connected on my
Raspberry relays. Everthing in Java and stable.
By checking the light outside (BBB) I can switch on or off the light
depending on the darkness before the sunset period and after the sunrise
period.
That system simulates presence too and has a movement sensor too (pratical
in the night)
I should probably check the memory leak on the BBB before ps-greping the
node bbbserver.js process in a watchdog rebot loop.
>
> > With IRC channel, your probably means I2C. Voltage and resistors, it's
> clear.
>
> No, IRC is the Internet Relay Chat software, a distributed chat
> application that developers tend to use. When people log in into IRC,
> they tend to watch it in real time, so potentially It provides more
> immediate communication. This list is email-based so everyone has to
> actively go and check the new emails.
>
I understand now, sorry. No need of IRC I think. I think it's a good way
too to search for learning (as well as finding crazy comments)! Although!
>
> > Then, it's a question of hardware and conditions, like a DS18B20 on my
> BBB with 5V over a 5 meters cable ... and works as a charm.
>
> If you place an analog voltage greater than 1.8 Volts on the analog
> input pin of the BBB, you will destroy that input. This is different
> from DS18B20, which has a digital one-wire interface using I think
> standard 3.3V digital signaling. Note that 5V is too much: you need to
> drop the voltage to 3.3V even for digital signals.
>
Thanks for the 1.8V input. I did not care too much!
The way I did: I built my 3 temperature cables (2 with LM35 and one longer
going outside) and check them on the Arduino by identifying the right
voltage/resistance. Then I installed them, one by one, on the BBB with
individual python scripts,
At the end everything goes into one python script running all the time.
The 3 temperatures are read constantly and stored in a delimited file.
One to measure the input of the heating system, another for the output
(heatpump (geothermic)) and the last for the outside temperature. With that
I was able to adapt the regulation of the heating system to get the best
temperature in the house with the best costs (2 different tarifs in the day
and better usage of my 60m2 photovolaic panels).
The analysis in made on PC with Excel graph and this is really nice and the
result fine!
The python part works from 6 months, the light measurement (Bonescript)
recent.
Thanks a lot
Best regards
Jean-Bernard
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