How do I open CSV file stored in my asd folder?

MIT App Inventor Help
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1

I have a sensor giving input to my app via bluetooth from esp32. Those sensor values are being stored in a CSV file. How can I access the values of sensor being stored in the CSV file.

Example scenario
When I am recieving the data from sensor and I want to check on the go in real time what data is being stored in the CSV. With the help of a button I want to open the file and read from it while the data is still being stored in it.

Can anyone help how can I go along with this task?

2

Use the File component to open a csv file stored in your ASD.

It won't update as more data is added (unless you programmatically keep opening it and reading it), you would need to take a different approach for that, and output the incoming values to a label / or similar

3

Hi thanks for the reply,

I did try that it shows blank white screen. And nothing else.

4

Show your relevant blocks

5

Screen -1

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Screen - 2
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Screen - 3
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6

You are burying your file in a deeply nested path that is unnecessary

image

Just use this for your path

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Keep things simple to begin with, try to open your file on the same screen, when this works, develop onwards....

7

Thanks for the reply

I did try the simple way but nothing happened .

What can I do differently from the above approach to establish the same task?

8

You do not show how you are saving the file in the first place ?

9

"How do I open CSV file stored in my asd folder?"

It should read, how do I read a CSV file in my ASD folder?
By reading it with FileScope=App with the File component and just specifying the filename there.

Note: The File component does not use an absolute or full path, but only the file name for the ASD and otherwise a relative path (for FileScope=Legacy or Shared).

10

thanks for the correction.

did tried the method but it still doesn't work

i want to select the csv files from the list and want to open and read it in the screen 2.

so far i have reached to this but in second screen there is no display.

Screen 1

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screen 2
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11

using the file block i am appending it in csv file.

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12

Show all relevant blocks.

13

"Do it" on this block and post the result:

grafik

14

use Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools
Taifun

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.

15

I know this is not an App Inventor solution, but this App https://play.google.com/store/apps/details?id=de.kai_morich.serial_bluetooth_terminal works well. Displays latest data and also logs it to a file.