Arduino mega 2560 Serial monitor not displaying data

Projects General Guidance
1

Hi,

I use an Arduino Mega 2560. Since today I have been experiencing a strange problem. The GPIO pins are able to take input and give output but nothing is displayed on the serial monitor.

Has anyone faced this ?

kindly suggest.

Regards,
Venkatesh.

2

venkeeg:
kindly suggest.

Post your program. Without that we have no idea what you are trying to do.

How is the Mega connected to your PC?

...R

3

Hi Robin,
Kindly find the code below. I am just trying to glow an LED for any character pressed on the bluetooth terminal installed on my mobile.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10,11);

void setup()
{
pinMode(5,OUTPUT);

Serial.begin(9600);

mySerial.begin(9600);

}
void loop() // run over and over
{
if (mySerial.available())
{
char c = mySerial.read();

if(c >= 97 && c <= 122 || c >= 65 && c <= 90)

digitalWrite(5,HIGH);

Serial.write(c);

//Serial.println(c);
}
}

Regards.

4

Please use the code button </> so your code looks like this and is easy to copy to a text editor. See How to use the Forum

Also please use the AutoFormat tool to indent the code for easier reading.

I will do it for you this time

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10,11);

void setup()
{
    pinMode(5,OUTPUT);
    Serial.begin(9600);
    mySerial.begin(9600);

}
void loop() // run over and over
{
    if (mySerial.available())
    {
        char c = mySerial.read();
        if(c >= 97 && c <= 122 || c >= 65 && c <= 90)
        {
            digitalWrite(5,HIGH);
        }
        Serial.write(c);
        //Serial.println(c);
    }
}

Note that I have inserted a pair of {} for the second IF statement to clarify what it is supposed to do. I may not have done it as you intend.

Why are you using SoftwareSerial on a Mega when it has 3 spare HardwareSerial ports that work much better?

Put a message in setup() to prove that the printing is working - for example

Serial.println("My program is starting");

...R

5

Please use code tags when posting code. Edit your post, place [code] before your code and [/code] after your code.

Next you're using SoftwareSerial on a Mega. Why? You have 4 hardware serial ports available; use one of those.

I'm not quite sure of the operator precedence; try

if ((c >= 97 && c <= 122) || (c >= 65 && c <= 90))
6

Hi..

Thanks for the info.

is there a function to read the hardware serial ports ?

Regards.

7

You use exactly the same functions as for Serial; so e.g. Serial1.begin(), Serial1.read() and so on.

8

Used Serial2 ( pins 16,17) ..thanks a lot.