Online heating system control project
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online heating system control project
bits and pieces
version 3
- write a php file that PUTS some light on on the AVR
- collect data from AVR and store it in mysql
- view the saved data on a client using javascript
code working on arduino
JSON from arduino to PHP server
- php in /var/www/feeds/getnoise.php, arduino sketch /tim/Documents/electronics/Arduino/phptest/phptest.ino
Encoding pin values in JSON: <syntaxhighlight>
// last pieces of the HTTP PUT request:
client.println("Content-Type: application/json");
client.println("Connection: close");
client.println();
client.print("{");
// here's the actual content of the PUT request:
for (int analogChannel = 2; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
String schan = "\"sensor" + analogChannel + "\":";
client.print(schan);
client.print(sensorReading);
if (analogChannel != 5) {
client.print(",");
}
}
client.println("}");
</syntaxhighlight> Reading arduino JSON from PHP server: <syntaxhighlight> <?php $thefile=file_get_contents("php://input"); echo ($thefile); $thearray = json_decode($thefile); print_r($thearray); ?> </syntaxhighlight> Output produced: <syntaxhighlight> {"sensor2":376,"sensor3":349,"sensor4":251,"sensor5":285} stdClass Object (
[sensor2] => 376 [sensor3] => 349 [sensor4] => 251 [sensor5] => 285
) </syntaxhighlight> <sytaxhighlight> </syntaxhighlight>
version 5
raw DS18B20 to server, convert and send back to serial monitor
Uploaded to Arduino is hsc_tempJSONphp.ino Raw data is sent by arduino to /var/www/feeds/getnoise.php which puts it in an object and then creates another object containing F converted sensor readings for date coming off ONEWIRE connected sensors.
Trying to convert to float on the Arduino wasn't working. Why push it? I've got unlimited power on LAMP server.
version 4 - temp readings beyond serial monitor
version 4a - DS18B20 readings to JSON
version 4b - JSON from arduino to PHP server
- a) separate out a function to provide a reading to send to cosm for pin 0(14) and 1(15)
- 1 one possibility - send to cosm. This is better than having a webclient like thermometer.ino. Get it to Cosm and then later set up an api like cosm
version 3 - onewire demo
Put sample code in function getTemp(). Subsequent calls of the function don't reset the device counter. this is good.
On serial monitor running DS18x20_Temperature.ino ala the library here. Of note: How it polls each device: <syntaxhighlight>
if ( !ds.search(addr)) {//this is where it loops to the next address
Serial.println("No more addresses.");
Serial.println();
ds.reset_search();//if there are no more devices go back to start of list
delay(250);
return;
}
</syntaxhighlight>
version 2
- Online thermometer creating web page in which you call for the data by clicking a button. Uses design from Practical Arduino in /tim/Documents/electronics/arduino/thermometerthermometer.ino and it runs at http://10.0.1.79
version 1
- Take random readings from analog pins start an etehrnet client that sends them out to http://cosm.com (mcktimo 6j) every ten seconds :comtest.ino
final narrative
An Avr takes in temperature readings from multiple locations. At the control room the AVR hub polls temperature and for each zone knows the set temperature, the default temperature and whether or not a zone is ON and how long it has been on. If it doesn't hear from the (linux) scheduler then it falls back to act as a multi-zone thermostat set at the default temperatures. Through a rudimentary display it would allow you to set temperatures for each zone.
The scheduler would take temperature data from the AVR client and would know the schedule. Whenever a schedule change point would come up, it would notify the AVR and instruct it to change the set point. It would do this via chrontab maybe.
The controller would on the client probably an HTML5/javascript client. Here you can read the temperatures and view the schedule. You can override or change the schedule.
possible routes
A cheap circuit like http://www.craig.copperleife.com/tech/thermo/ or more complicated http://www.rentron.com/project01.htm using http://datasheets.maximintegrated.com/en/ds/DS1620.pdf which can be overridden by server program that controls multiple thermostats.
ReST
- cosm curl helper
- http://api.cosm.com/v2/feeds/83080/datastreams/noise.csv?start=2013-01-11T19:30:00Z&end=2013-01-11T21:00:00Z&interval=0 doesn't work
- http://cosm.github.com/cosm-js/tutorial/
- accessing-incoming-put-data-from-php
- create-a-rest-api-with-php
- http://rest.elkstein.org/2008/02/using-rest-in-php.html
- http://blog.garethj.com/2009/02/17/building-a-restful-web-application-with-php/
- get for my feed
- making-reliable-connections-with-arduino
websockets
- http://code.google.com/p/phpwebsocket/
- start-using-html5-websockets-today
- cosm javascript library docs
Cron Jobs
- Hudsonvalley#cron_and_backups
- http://net.tutsplus.com/tutorials/php/managing-cron-jobs-with-php-2/
- http://stackoverflow.com/questions/4421020/use-php-to-create-edit-and-delete-crontab-jobs
parts
DS1620 Digital Thermometer and Thermostat
In a thermostat circuit $2.20 for dip
DS18B20 Maxim 1-wire temperature sensors
- DS18B20 datasheet$1.00 each for chip, $3.00 each for waterproof sensor
one-wire protocol
- https://arduino-info.wikispaces.com/Brick-Temperature-DS18B20 multiple
- OneWire tutorial another better library
- color code for encased DS18B20 sensor red=vcc,black=gnd,yellow=data
