Led light control of th thingy.

[OlivierOZEO]

Hello,

I try to control led light of the thingy52 throw a MIT app inventor application.

I use the UUID : ef680300-9b35-4933-9b10-52ffa9740042

and thr characterixtic : ef680301-9b35-4933-9b10-52ffa9740042

I try to send 4 byes : 1 - 0 - 255 - 0, in order to have a green constant light.

But it does not do anything.

When I want to read the characteritics, it send me 2 2 20 172 13.

But I dont understand why the is 13 in th chain.

[tesc]

Hi,

13, or 0x0D, is the ASCII character for "carriage return". I do not know for sure, but if I should guess I would guess that the commands (both sent and received) must be terminated with this character. can you try that? (I.e., in your terms, "send 1 - 0 - 255 - 0 - 13")

Regards,
Terje

[OlivierOZEO]

I have tested different format but none of them work. Do you have an idea?

Maybe, it is the initialize global fonction that create an integer variable.

[tesc]

Hi,

I can confirm that you need to terminate the command with a carriage return character (the 0x0D byte). The line that you want, e.g. 2 2 20 172 13 in decimal, and where the last value of 13 is the carriage return, corresponds to writing a string of the following five bytes to the characteristic: 0x02, 0x02, 0x14, 0xAC, 0x0D.

So the remaining question is how to write that string using the MIT app inventor application, for which I am afraid I cannot help you. Is there any support services or forums for that application, that you can use in order to figure this out?

Regards,
Terje

[OlivierOZEO]

Does the code will help you?

[OlivierOZEO]

Is it normal that the thingy is not on my bluetooth associeted list?

[OlivierOZEO]

I finally succed with using writebyteswithresponse instead of writebytes.

[tesc]

Hi,

Sorry for not responding, I was out-of-office over the past days. Happy to hear that it worked out in the end!

The terms "writebytes" and "writebyteswithresponse" does not mean anything in BLE terminology, so it is probably something unique for the MIT app inventor application.

Regards,
Terje