Hello,
I'm currently trying to connect my Nano up to a TTL -> RS232 converter but I've been having problems. I am currently powering the Nano through the Vcc and GND pins so that USB doesn't interfere with TX and RX.
It seems that the TX pin isn't sending any signal to the converter and when I hook a multimeter up to it, I get a reading of 3.3v. I know the TX pin is normally high so I loaded this sketch into it:
char mystr[5] = "Test";
void setup() {
Serial.begin(115200);
}
void loop() {
Serial.write(mystr, 5);
}
My thought was that if I was constantly sending serial data, then the pin should be low. The TX pin was still high. I would also like to note that I could still read the data through the Arduino serial monitor if the Nano was hooked up via USB.
Then I tried this sketch to make sure I wasn't making a mistake:
void setup() {
//
}
void loop() {
//
}
And the TX pin still read high. With either sketch I feel like the state of the TX pin should've changed.
I don't feel like I've fried any hardware on my board since I'm still able to upload and run programs so I'm really at a loss as to what the problem could be. There was another forum post that talked about an error in the mbed library for these boards but I couldn't find what they were talking about (Post here). Another forum post had mentioned something about setting the correct TX/RX pins in your flash memory and I have done some experimenting with the memory but it's never been anything destructive so I'm also not sure if that'll lead to a solution.
Thank you for your help!