This is a short article, some "tips&tricks" if you need to plot a chart with data generated from the Arduino Yun.
I report it here, just to report my work.
This article starts from this: http://arduino.cc/en/Tutorial/TemperatureWebPanel that explain how to use the Bridge to capture data from a temperature Sensor and make the data accessible from a web page inside an sdcard on the Yun.
Plot a chart
My scripts, it helps to plot the last 5 temperatures.
You have to change a little bit the script on the page and replace some files.
1 - I've added this at the beginning of the arduino script:
to save the last 5 temperatures
2 - Replaced this part
client.print("Current time on the Yun: ");
Current temperature: ");
client.print(" degrees C");
This sketch has been running since ");
Hits so far: ");
with this one:
lastTemp[hits%5] = temperature;
So the page from arduino now it retuns all the data plus the last 5 temperature read, separated by ";"
3 - I've replaced the files in /arduino/www/TemperatureWebPanel with the ones HERE: it uses jquery and jflot
This is the final plot:
This is not the rightway
My script plot the last 5 request read from the sensor, but the right way is to leave the arduino part to ciclic fetch the temperature and save it on a file on the sdcard.
The html/js page need to read the same file and plot the temperatures with the data from the file.
I will update it later with a new solution.