I am designing an app that allows users to control the intensity of 6 rows of LEDs as well as monitor humidity and temperature levels. The app actually works, however- every time I change the LED intensity, it sends a notification that my list index is too large. I can click it away but it is very annoying. I would appreciate any help D: - I think its only a MIT issue but Ill also send the Arduino code just in case.
App_copy.aia (4.4 KB)
APPCODE.ino (1.9 KB)
ARDUINO CODE
I can see only 2 list block . Are you sure that in list LISTA there are always minimum 2 items ?
Connect to Companion, right-click on this block, select "Do it" and post the result.
You should also disable the timer in the Clock.Timer event.
Be sure to use println() at the end of each message to send from the sending device, to signal end of message.
Only use print() in the middle of a message.
Be sure not to println() in the middle of a message, or you will break it into two short messages and mess up the item count after you split the message in AI2.
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.
Some people send temperature and humidity in separate messages with distinctive prefixes like "t:" (for temperature) and "h:" (for humidity).
(That's YAML format.)
The AI2 Charts component can recognize these and graph them. See Bluetooth Client Polling Rate - #12 by ABG
To receive YAML format messages, test if the incoming message contains ':' . If true, split it at ':' into a list variable, and find the prefix in item 1 and the value in item 2.
So I did it and this is the result:
If I'm not connected to my Bluetooth module on the companion then it just asks if I'm not connected to a device. Otherwise, no issue there.
You were right, there was not enough items, I added an if block that checks the length of the list first.
Thank you so much for your detailed help, I will definitely be checking out more of the tutorials linked. I also modified the DelimiterByte per your suggestion and got rid of any printIn() in the middle of messages that slipped into my Arduino code. Again, thank you so much.