Sensmon couchdb
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This document discusses CouchDB and a project called sensmon that uses CouchDB to store sensor data from an Arduino. Key points: - Motokazu Nishimura introduces CouchDB and its features like JavaScript and JSON support. - The sensmon project collects data from an Arduino's sensors and stores it in CouchDB using HTTP POST requests. - Data is visualized from CouchDB views using the Flot library to plot temperature over time. - A related project, sensmon-calendar, uses CouchDB map/reduce to summarize temperature data by day.
![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](https://image.slidesharecdn.com/sensmon-couchdb-101212075320-phpapp02/85/Sensmon-couchdb-15-320.jpg)
![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](https://image.slidesharecdn.com/sensmon-couchdb-101212075320-phpapp02/85/Sensmon-couchdb-16-320.jpg)
Sensmon couchdb
- 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