Arduino-serial: C code to talk to Arduino

186 Replies to “Arduino-serial: C code to talk to Arduino”

1. Thanks, but still getting a “No such file or directory” error. Anything else I might try?

   Carl

2. Hi Carl,

   Your command looks good. But since “arduino-serial” was written back before the auto-resetting Arduinos, you may want to add a slight delay before sending the “a” to let the Arduino come out of reset. That is, try:

   ./arduino-serial -b 9600 -p /dev/tty.usbmodemb21 -d 2000 -s a

   This will cause arduino-serial to open the serial port (which causes the Arduino to reset), wait 2 seconds, then send an “a”.

3. Thanks, been trying a bunch of variations of the command above that sends a single character
   but no go yet. I substituted the name shown in the Arduino app for the board and tried this to send it an
   “a” but still no joy.

   ./arduino-serial -b 9600 -p /dev/tty.usbmodemb21 -s a

   Any thing else I might try.
   Very much appreciate your help.

   Carl

4. Thanks, been trying a bunch of variations of the command above that sends a single character
   but no go yet. I substituted the name shown in the Arduino app for the board and tried this to send it an
   “a” but still no joy.

   ./arduino-serial -b 9600 -p /dev/tty.usbmodemb21 -s a

   Any thing else I might try.
   Very much appreciate your help!

   Carl

5. Hi Carl,
   Yup, those commands are run from Terminal.app. When you open Terminal up, you will see your computer name instead of “laptop”.

6. Dumb question I’m sure, but are these commands executed from the Terminal app?
   Also how do I define my machine as opposed to the “Laptop” used in the samples?

   Thanks,

   Carl

7. It works for me on Mac Lion. Thank you for this code sample.

8. To those getting gibberish when reading,
   Are you placing the -d before the -r ?

   example working command:

   ./arduino-serial -b 9600 -p /dev/ttyUSB0 -d 2000 -r

9. Well, it seems there really isn’t a solution here. Too bad for the lack of support (or suggestions), I really liked this library.

10. I’m having the same problem as Nicola, what to do?

11. Just wondering if you had any suggestion on what I should try?

12. By the way, even using CoffeeNinja’s example I get the same gibberish (namely: testtest, tt, tetest), even after adding a delay…

13. Thanks for the fast reply and for any insight. Yes, I am using serial.println(). As I mentioned, I can read the serial well using other methods, including a very simple python script I wrote.

    Here’s the very simple sketch:

    
    int ledPin = 13;   // select the pin for the LED
    int i=0;           // simple counter to show we're doing something
    
    void setup() {
      pinMode(ledPin,OUTPUT);   // declare the LED's pin as output
      Serial.begin(9600);        // connect to the serial port
    }
    
    void loop () {
      Serial.print(i++);
      Serial.println(" Hello world!");  // print out a hello
      digitalWrite(ledPin, HIGH);
      delay(500);
      digitalWrite(ledPin, LOW);
      delay(500);
    }

14. Can you paste in the sketch you’re using on the Arduino? Are you doing a Serial.println()?

15. Hi,

    Thanks for this great library. I am having issues with it, when trying to read from serial. I am using, as a test case, the Hello World program which is supposed to output: “0 Hello world!” “1 Hello world”. Instead I have only random chunks, such as: “0 world!”, “0Hello world!”, “0 H world”, etc…

    I tried several delay times, with similar results. I wonder, why isn’t the system reading the full string?

    Thanks for any insight.

16. Pingback: MidiSerial Updates | BlipBox Project Blog

17. Regarding my last post, I just need to add some delay

    -d 2000 did the trick

18. I am getting jibberish when reading with this, any ideas?
    
./arduino-serial -b 9600 -p /dev/ttyUSB0 -r
read: ?/|?5|?


    The jibberish changes even though I’m writing a static string of “test” to the serial port from arduino.

    Baud rates are the same, serial monitor from arduino IDE and cat /dev/ttyUSB0 shows “Test” which is what I would expect.

    Sketch:
    
void setup(){
Serial.begin(9600);
}

    void loop(){
Serial.println("test ");
delay(1000);
}


19. Hello. I added fsync(fd) into serialport_write() function.

20. Hi Joshua, Apologies, I had some file issues. The updated version of arduino-serial with the ‘-d’ option is back now.