Will it be Okay to post whole .aia file of the project?? I am not familiar with backpack yet.. Thanks..eBike_1v03.aia (56.4 KB)
Got it. I understand..
...........Any luck?
Not yet. Please download my project .aia and review/comment. As I am a novice, I don't have the analysis capability.. This is my first trial and there should be many mistakes even though I was able to get up to 6 variables. The problem, List index too large happens with 7th variables.
Hi
I need the Script too - can't fix comms with only one end of the string 
What do you mean by script?? Is it Arduino code?? Re the app, I sent project .aia..
...Taking a dinner break, get back to you later this evening (UK time)
What do you get if you disable Labels (2, 5, 8 ... 17) and put a
Label2.Text = input
OK.. Thanks.. I've been in UK many times when I was working for IBM. I visited IBM Hursley and Greenock.
I worked at IBM Hursley for four years back in the 90's 
What is this, confession time? 
Better than working for Morecambe and Wise... that nearly happened too 
I'm not sure about that - did you see the documentary about Eric, with his home movies of the family etc? Probably would have been fun to work with those two.
Do you really need to send a value to Arduino before receiving values?
Edit: If so, use a seperate Clock Timer for that event, then that Timer can call the Data-Receive timer. App Inventor Blocks that have the blue symbol top left can be expanded with a left-click - e.g. an If Block can be expanded to If-then-else if-else etc.
There's too much wrong in your Project for me to correct, so I'm attaching a basic setup that you can expand. Your global list should be initialized as a List (not a dictionary). Your timer is set in Properties - set it in Blocks as per my example. Note, your timer is @ 1000 millis, but the data is being sent every 200 millis! Sending and displaying the data faster than every 4 to 5 seconds is pointless - the human eye cannot follow a screen updating that fast.
BT_Basic_Setup.aia (8.4 KB)
Dear Chris,
Thanks for your advice and now I can get 7 variables without any problem. The App sends a request to Arduino in every 1 sec asking for variables. Then the Arduino sends variables when it receives a request from the App.
eBike_1v01.aia (57.2 KB)
See my .aia as attached. I reset Version to 1V01 and so please don't be confused. Any comments will be appreciated.
Thanks..
Tim,
Very pleased to meet you. Hursley lab in Winchester was a very nice place to visit. I still remember the Cathedral.
Cheers..
Strangely, there seems to be a number of posts missing from this topic.