I have a problem in display my chart. I have X element passed one number. e.g first it will be in 1 but the second bar it will be in 3. What happen with my code?

MIT App Inventor Help
1

blocks(3)
blocks(3)1855×1940 632 KB

2

What are the possible values returned by the dataChanged event for the tag "onoff" ?

3

3 values. they are 1, 0, and 2. that numbers is request and response from firebase. I am making request and response from microkontroller to software.

4

do you know how to safe data in tinydb permanently in my device. last one, do you know how to make every single bar have a different color depend on the value?

5

blocks
blocks1212×1940 387 KB

this is my new source code.

6

See Bluetooth Client Polling Rate - #11 by ABG

for the format favored by the AI2 Graph component's TinyDB GraphData subcomponent.