Reading multiple indices from a list

MIT App Inventor Help
#1

Hi All,

I am using an IMU sensor that has a built-in BlueTooth module. I am able to read data from the device via classic Bluetooth. My output and my sensor are in the following picture

image
image768×1024 59.8 KB

As you can see it starts with 58 which is hexadecimal format. And I need to read 7-10 or 11-14 ..... indexes separately because let's say indexes 7-10 is represents Float32. There is almost 26 float 32 or int16 data type in this Byte Array. My question is

How can I obtain 7-10 indexes into a new list and how could I read 4 bytes as a float 32.
BT_Basic_Setup_Receive.aia (7.2 KB)

Manage float data received from ble
#2

Not really. If it were in hexadecimal format, wouldn't it have characters A-F in the display, in values from 00-FF?

Since the numbers in the list are in the range 0-205 (yes, I actually read the numbers) I am pretty sure these are decimal numbers representing unsigned byte values.

Regarding extraction of sets of 4 consecutive items from the list(s), that would involve the list SELECT block (I gave you one recently, ,maybe you read it?) repeated 4 times for consecutive indices, with the base increasing by 4 for each loop.

See the free book in

for chapters on how to loop and how to work with lists.

For conversion to floating point numbers, here is a sample project:

https://groups.google.com/d/msg/mitappinventortest/Mnmk2wfTFK8/CkUsAbLtBgAJ

1 Like