Arduino sensor data real time plot in android app

[Dineth Senevirathne]

hello,

i recently developed an arduino code which outputs 2 float values. i sent these 2 values to the android phone via Bluetooth using an small app made with app inventor. now i want to plot these values on a real time scatter plot.can anybody guide me how to plot the values in a real time plot.

[Ghica]

Maybe this post can help you out: https://groups.google.com/forum/#!msg/mitappinventortest/fDhJWjQCChY/DiEX7bLmAgAJ;context-place=msg/mitappinventortest/N6PatmnYCAU/HZa6WqtSCgAJ
Cheers, Ghica

[Abraham Getzler]

This sample app in the Gallery plots random shrinking

disks on a Canvas.

You can adapt it to use incoming x,y values instead,

with the appropriate scale factors.

I suggest a couple of sliders to set the scale factors.

http://ai2.appinventor.mit.edu/?galleryId=6337164802260992

ABG

[Dineth Senevirathne]

also there is another issue,

i receive two values as a string like (23.56,89.34)

How can i separate  these values as 23.56 and 89.34 and save in 2 variables? (like buffers)

[Abraham Getzler]

Are the () included?

If not, just take the string and use a split at comma block to turn it into a list,

and select them by index using a list block.

To remove (), use the text replace block.

ABG

[Dineth Senevirathne]

it is without ().
of i seperate two values with comma.
how can i use these values to plot the graphs.( how can i plot the x,y values using above list?)are there any conversion method from string to float?

[Abraham Getzler]

are there any conversion method from string to float

AI2 numeric type conversion is automatic (Duck Typing)

how can i use these values to plot the graphs.( how can i plot the x,y values using above list?

Before you tackle realtime graphing,

maybe you should review a few examples of static charting

to get a feel for how to scale values to the Canvas size.

See the Charts and Graphs section of this FAQ:

https://groups.google.com/forum/#!msg/mitappinventortest/wqJin0qO8M0/8xUafdROAgAJ

for samples.

Also use the search bar in this page for "realtime chart" in case you get lucky.

ABG