hi everyone. I have a problem. I'm make a project and i need read a list from bluetooth. I'm trying to do it this way but I do not get it. I would need help.
from arduino I send data as in the image and I need to save it in a .CSV file
Please see the Delimiter article in FAQ
Be sure to use println() at the end of each message to send from the sending device, to signal end of message. Do not rely on timing for this, which is unreliable.
In the AI2 Designer, set the Delimiter attribute of the BlueTooth Client component to 10 to recognize the End of Line character.
Also, return data is not immediately available after sending a request,
you have to start a Clock Timer repeating and watch for its arrival in the Clock Timer event. The repeat rate of the Clock Timer should be faster than the transmission rate in the sending device, to not flood the AI2 buffers.
In your Clock Timer, you should check
Is the BlueTooth Client still Connected?
Is Bytes Available > 0?
IF Bytes Available > 0 THEN
set message var to BT.ReceiveText(-1)
This takes advantage of a special case in the ReceiveText block:
ReceiveText(numberOfBytes)
Receive text from the connected Bluetooth device. If numberOfBytes is less than 0, read until a delimiter byte value is received.
If you are sending multiple data values per message separated by | or comma, have your message split into a local or global variable for inspection before trying to select list items from it. Test if (length of list(split list result) >= expected list length) before doing any select list item operations, to avoid taking a long walk on a short pier. This bulletproofing is necessary in case your sending device sneaks in some commentary messages with the data values.
Hello Martin
Your code to receive data is not correct, I will attach a basic template file that you can use or plunder.
However, you are streaming data every second, which is very fast. The general rule is to make the time interval as long as is practical and still meet requirements. So have a think about it, because high speed data processing is more likely to fail - will the huge file it produces be less useful if the time interval was two seconds?
Also, how are you going to end the process?
.... we also need to see your Arduino Sketch, which you can upload here as a .txt file.
It's possibly best to stream the data to a Label component first, then when the stream has ended, save the data to a file. How long does the stream run for?
BT_Basic_Setup_Receive.aia (7.2 KB)