Thanks!

edit: I understand I should use zl group and another external object called "iem_alisttosym"
I download the iem externals but for some reason that object is dashed out.

I did the above and it seems pd is not recognize the object

btw - will it work also in pd running on raspberry pi?

edit: I fixed it by make another path to that specific folder where the serial_print object is located at..

I did so and still get an error of "unknown declaration"

The think I don't understand

while in arduino it printed to the serial as the following:

How can I receive the exact same print I have in the arduino serial from your serial_print object?
It seems it separate the symbol to the right outlet and the integers/floats to the left. I can't get them together exactly as it printed to the serial?

in pd the print looks like this:

pd printed only the numbers, without the string. Like the above I will not be able to route the data from different sensors. Why is that?

value_ch0 ch0on value_ch1 ch1on value_ch2 ch2on

Serial.print("value_ch0 "); // mind the white space after the tag name
Serial.println(value1); // I assume that 'value1' here is a variable that holds the value you want to send
Serial.print("value_ch1 ");
Serial.print(value2);

Though this is rather cumbersome, it's better to do this in a loop, like this:

for (int i = 0; i < numCh; i++) {
  // construct a string like "value_ch0 ", "value_ch1 ", etc. using std::to_string from C++
  Serial.print("value_ch" + to_string(i) + " ");
  Serial.println(values[i]); // this example assumes you have all your values in an array called "values"
}

But you could also use just one tag and send all your values under that tag and in Pd separate them with [unpack]. In this case the code would be something like this:

Serial.print("values "); // take care to include the white space
for (int i = 0; i < numValues; i++) {
  Serial.print(values[i]);
  Serial.print(" "); //  print a white space to separate values
}
Serial.println(); // finally print the newline character to denote the end of the list

I've restart pd and reboot pi and the object is not recognized. I also try to add another path to that specific folder (in which the serial_print object is located) and still - object is not recognized.

Those adding external to pd on Raspberry pi is different process?

Thanks for any help!

edit:
Ok, it bis working when specify the path to the folder within the externals.
I don't know why the external folder itself (which is the default path) is not enough for recognizing the externals in that folder