DEC to HEX from Bluetooth connection to create a live graph

MIT App Inventor Help
10

Here is my take on receiving mixed UInt8 and UInt16 data ...
global signalPairs

signal
signal1094×354 43.8 KB

when Clock1 Timer
when Clock1 Timer1952×892 167 KB

troubleshhotABGScreen2.aia (375.1 KB)

P.S. These blocks can be dragged directly into your Blocks Editor workspace.

See A way to group projects by theme - #10 by ABG
for a demo.

Note how I switched to Unsigned bytes, and I eliminated the double list-text conversion you had on the way into the Data list. (ReceiveUnsignedBytes returns a list).