TX pin not working well

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1

Hello,

I'm working with Dynamixel XL-320 servos, which are controlled with serial protocols. So, I wire my Arduino and the servo like this:

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(The Arduino is powered using the jack connector at 7.5V)

and I send to the Arduino the following code:

#include "XL320.h"

#define SERVO_BAUD_RATE 9600

// --- Robot definition
XL320 robot;
char rgb[] = "rgbypcwo";

void setup() {
  // --- I/O config
  pinMode(13,OUTPUT);               

  // --- Begin serial communication
  Serial.begin(SERVO_BAUD_RATE);       
  robot.begin(Serial); 
  
  delay(100);

}

void loop() {

  digitalWrite(13,LOW);
  
  // --- Turn on motor LED
  robot.LED(0xFE, &rgb[random(0,7)]); 

  // --- Control
  delay(500);
  digitalWrite(13,HIGH);
  delay(500);
  
}

The code uploads perfectly on the board and it starts working: the board's led blinks and the TX led also does.

I know that, if a want to communicate with the servo I'll have to use pin 1 and I won't be able to do it until the USB bootloader is disconnected....So, I unplug the usb, I connect my pin 1 to the servo, I press Reset and....nothing happens :confused: :cry: The led of the board (the #13) blinks correctly, but the TX led remains off all the time...

Thank!!!

2

The Rx and Tx LEDs are driven by the USB interface chip when it talks to a PC.