R_Gol

I try to understand the data I'm sending from Max to Arduino but got confused. 

then it been converted to integer using atoi.

the data present at the input of the serial object is a integers or ascii numbers? 

what actual type of data will receive by the arduino?

ascii2.png

I try to understand the data I'm sending from Max to Arduino but got confused. 
the data A 1 is a string (?)
then it been converted to integer using atoi.
the data present at the input of the serial object is a integers or ascii numbers? 
what actual type of data will receive by the arduino?
a 3 byte chars? 
an integer? 


asci-object-type-of-data-at-output

Serial object sends bytes - that are 8 bits integers

If one wants to send & receive anything else than 

numeric 0 - 255, one has to convert Max list

into stream of ASCII codes for each char and digit.

If you simply send 100 without ATOI conversion,

it will in arduino be seen as integer 100 and parsed the way you want,

Midi works exactly same way, that is why midi has

absolute limit 0 - 255, and controls 0-127, because higher

bytes are reserved for status, real time etc messages.

image.png

A 1 in Max is a list with capital letter A and integer 1.


Serial object sends bytes - that are 8 bits integers
0 - 255.
If one wants to send & receive anything else than 
numeric 0 - 255, one has to convert Max list
into stream of ASCII codes for each char and digit.

That is job of ATOI - ITOA
integer from/to ASCII.
If you simply send 100 without ATOI conversion,
it will in arduino be seen as integer 100 and parsed the way you want,
either as numeric 100, or a char d (ASCII 100 = d) 
Midi works exactly same way, that is why midi has
absolute limit  0 - 255, and controls 0-127, because higher
bytes are reserved for status, real time etc messages.
----
Example 
you send 100 directly to serial object or d via ATOI



In Arduino read 
if (XXX == 100) is same as
if (XXX == 'd') 
-------
That is very basic infos.





ascii3.png

the output of the atoi object is also 100 (marked in green) but that 100 is not equal the 100 I marked in red?

because in arduino in order to read the output from the atoi I need to right: if (XXX == 'd')

but if I'm sending 100 directly to the serial (marked in red) - in arduino I'm reading it with: if (XXX == 100)

the output of the atoi object is also 100 (marked in green) but that 100 is not equal the 100 I marked in red? 

because in arduino  in order to read the output from the atoi I need to right:  if (XXX == 'd')
but if I'm sending 100 directly to the serial (marked in red) - in arduino I'm reading it with:  if (XXX == 100)

What I tried to explain is basics of serial communication.

And I said, no matter if you send 100 directly or d -> ATOI

you can test them as both 100 or 'd' becuse d is ASCII 100.

That works only for 8 bit bytes 0-255 !!! 

if you want to send 256,or -22, or 33333, you must use ATOI and parse it as int in arduino if you want to use it as int.

If you need a help with specific message or list of messages

sent from max to arduino, and write what you want to do with them in arduino, I'll be willing to help you.

The rest is - read arduino documentation, about serial communiction.

In max things are easy, for most, you need ATOI and

also insert newline - ASCII 10 at the end.

That will help to parse stuff in Arduino.

I am sorry, but there is no confusion.
What I tried to explain is basics of serial communication.
And I said, no matter if you send 100 directly or d -> ATOI
you can test them as both 100 or 'd' becuse d is ASCII 100.
see difference between if (XXX == 100) NO QUOTAS
and if (XXX == 'd' ) WITH '' QUOTAS, which tells arduino
how to interpret that byte.
That works only for 8 bit bytes 0-255 !!! 
if you want to send 256,or -22, or 33333,  you must use ATOI and parse it as int in arduino if you want to use it as int.
Same applies to floats.

If you need a help with specific message or list of messages
sent from max to arduino, and write what you want to do with them in arduino, I'll be willing to help you.

The rest is - read arduino documentation, about serial communiction.
In max things are easy, for most, you need ATOI and
also insert newline - ASCII 10 at the end.
That will help to parse stuff in Arduino.

I finally got it!! thank you very much for the time and effort to explain it!

atoi object type of data at output