Hello Forum,
I was debugging a strange issue with one of my projects, I reduced my code down to the code below. Essentially I am writing data to Serial2 and I am getting the data back in when I do Serial2.read(). Note though, this is with an Arduino Mega with NO connections at all, just the board plugged in with USB to computer. I also attached a picture of my code and serial monitor.
void setup() {
Serial.begin(9600);
Serial2.begin(9600);
Serial.println("ready");
}
void loop()
{
if(Serial2.available()){
Serial.write(Serial2.read());
}
Serial2.println("I shouldn't see this");
delay(100);
}
Can't open your picture on my cell phone; not your fault.
If you have rx2 and tx2 connected together, what you should see in serial monitor is the text "I shouldn't see this".
Hello everyone,
I think I solved my problem, it looks like some EM/interference stuff. If I plug jumper wires into the TX and RX lines and not hook them up to anything else it increases the affect, if I touch the wires that increases it too, but if I touch ground with my other hand it goes away, same thing if I attach a jumper to ground, it stops. Looks like if there is no load the RX line will pick up interference from the nearby TX wire?
It looks like when I had this in my project the RX line was disconnected and the TX line was connected. It was definitely confusing me since I was getting TX but no RX, and the RX I was getting was what I was sending!
