1. CouchDB
Couch
@motokazu
2010 12 12

2. • @motokazu ( Motokazu Nishimura )
• CouchDB
•
• “relax”
• javascript JSON
•
• Arduino
•
2010 12 12

3. •
•
• DB
• mapreduce CouchApp
• HTTP
• relax
2010 12 12

4. •
•
•
•
• (Google PowerMater) SSL+XML
•
2010 12 12

5. • ※
•
•
•
• Google PowerMater
http://www.google.com/powermeter/about/partners.html
• Google PowerMater
•
• Arduino + ethernet shield +
• CouchDB !! (+ Couchapp)
2010 12 12

6. 2010 12 12

7. • Relax
• CouchDB
•
2010 12 12

8. Sheevaplug
AC
ARM core 1.2GHz
Mem: 512MB
...
SD
※
2010 12 12

9. : Arduino +
• Arduino
•
•
• AD
• 0v 5v 0 1023 analogRead
• C
Arduino
• Pin
2010 12 12

10. CouchDB
• Vout( ) analog 2pin
• analogRead
int solarValue = analogRead(solarPin);
• sprintf json
sprintf(json,"{%cstime%c: %ld, %csolarpower%c: %0d.%d, %ctemperature%c: %d}",
q,q,now(), q,q,(int)solarpower,solarpower1, q,q,temperature);
• strlen content-length
sprintf(clength,"Content-Length: %d",strlen(json));
• CoucnDB http json POST
2010 12 12

11. Client client(server, 5984); // connect couchdb
Serial.println("connecting couchdb...");
if(client.connect()){
Serial.println("connected");
client.println("POST /sensmon HTTP/1.1");
client.println("Host: sheevabian");
client.println("Authorization: Basic xxx=");
client.println("Content-Type: application/json");
sprintf(clength,"Content-Length: %d",strlen(json));
client.println(clength);
client.println("Connection: Close");
client.println();
client.print(json);
Serial.println("POST OK");
} else {
Serial.println("connection failed");
return false;
}
client.stop();
2010 12 12

12. CouchDB
• {key: , value: }
{"_id":"676a376bc707cd7da0cb2c78050044c4","_rev":"1-a92b94af015ef8b1bed2df56f7e037c8","stime":
1291595210,"solarpower":0.63,"temperature":22}}
• DB
curl -X PUT http://localhost:5984/sensmon
( couchapp push )
• view
2010 12 12

13. •
• . Couchapp
https://github.com/couchapp/couchapp
• couchapp generate sensmon
• ...
• couchapp push !!
2010 12 12

14. sensmon
•
•
sensmon
sensmon
-calendar
https://github.com/motokazu/sensmon
2010 12 12

15. sensmon
• Flot
http://code.google.com/p/flot/
• (_view/all )Flot
<script src="/_utils/script/jquery.js?1.3.1"></script>
...
$.ajax({
type: 'GET',
dataType: 'json',
url: "/sensmon/_design/sensmon/_view/all",
success: function(data){
$.each(data.rows, function(id, val){
// temperature
var tmp = [val.value.stime, val.value.temperature];
tempd.push(tmp);
}
...
datasets.push({"label":"Temperature",data:tempd, yaxis: 1 });
...
var plot = $.plot($("#placeholder"), datasets , options);
}
2010 12 12

16. sensmon-calendar
• mapreduce + group=true
$.ajax({
type: 'GET',
dataType: 'json',
url: "/sensmon/_design/sensmon-calendar/_view/summary_temp_day?group=true",
map
var key = [d.getFullYear(),(d.getMonth()+1),d.getDate()];
emit(key, doc.solarpower);
reduce values.forEach(function(val){
max = Math.max(max,val.max); {"count":count,"max":max,"min":min,"ave":ave}
min = Math.min(min,val.min); {"count":count,"max":max,"min":min,"ave":ave}
{"count":count,"max":max,"min":min,"ave":ave}
ave += val.ave; {"count":count,"max":max,"min":min,"ave":ave}
count += val.count; {"count":count,"max":max,"min":min,"ave":ave}
{"count":count,"max":max,"min":min,"ave":ave}
}); {"count":count,"max":max,"min":min,"ave":ave}
ave = ave/values.length;
{"count":count,"max":max,"min":min,"ave":ave}
rereduce
return {"count":count,"max":max,"min":min,"ave":ave};
{"count":count,"max":max,"min":min,"ave":ave}
{"count":count,"max":max,"min":min,"ave":ave}
{"count":count,"max":max,"min":min,"ave":ave}
2010 12 12

17. sensmon demo
• demo : to localhost
2010 12 12

18. replication
• 0.11 1.X
• Bad Content-Type
• 1.X Futon _replication 0.11 source
2010 12 12

19. 2010 12 12

20. •
•
• relax
• db web
( delay)
2010 12 12

21. thank you
2010 12 12