Arduino Nano Soft serial interface problem

Development Libraries
1

Dear friends

Recently i have started working on Arduino Nano, my code is below , i un able to transmit & get the data on "soft serial "

Does soft serial work for Arduino Nano? Please let me know friends

//************
#include <SoftwareSerial.h>
SoftwareSerial mySerial = SoftwareSerial(10, 11);
// D6, D7 on board
void setup()
{
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.println("Goodnight moon!"); // it is printing on Serial monitor teminal
mySerial.begin(9600);
}

void loop()
{
mySerial.write('H'); // soft sending
char read_char = mySerial.read(); // soft reading
if(read_char == 'H') // comparing soft read data
{
Serial.println("Soft Serial is Working"); // it has to print on soft terminal
}
delay(1000);
}

2

Hi sreenivas

SoftwareSerial mySerial =  SoftwareSerial(10, 11);
// D6, D7 on board

I'm confused by the comment. On the Nano board, what are the labels by the pins you are using for SoftwareSerial?

Regards

Ray

3

What are you trying to talk to?

4

Hackscribble:
Hi sreenivas

SoftwareSerial mySerial =  SoftwareSerial(10, 11);

// D6, D7 on board




I'm confused by the comment. On the Nano board, what are the labels by the pins you are using for SoftwareSerial? 

Regards

Ray

Dear Ray,
Pins (10,11) = PD6, PD7 (of MCU) = D6,D7 (Marked on Nano board).
when i short / join them (D6,D7) , Code should print "Soft Serial is Working" on Serial Monitor.
Let me know whats wrong in my process.

5

PaulS:
What are you trying to talk to?

Dear Paul,
Sorry i did not mentioned the problem,

when i short / join them D6, D7 ( MCU pins 10,11 ), Code should print "Soft Serial is Working" on Serial Monitor.
but its not. i observed read char is getting the value (-1).

6

If you are using digital pins 6 and 7 of Nano, try 6 and 7 in SoftwareSerial statement.

7

Hackscribble:
If you are using digital pins 6 and 7 of Nano, try 6 and 7 in SoftwareSerial statement.

Dear friend
i tried as below , even though its not working as i expected

i am using
IDE : Arduino 1.0.5-r2
Hardware: Arduino Nano

Let me know any modifications to be done

//**************************************************************************
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10,11);

// Trial 1
// shorted D6, D7, output on serial monitor is
// Goodnoght moon!
// -1A-1A-1A

// Trial 2
// shorted D10, D11, output on serial monitor is
// Goodnoght moon!
// -1A-1A-1A
//(same output in both the cases)

void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
Serial.println("Goodnight moon!");
}

void loop()
{
mySerial.print('H'); // Soft serial print
Serial.print(mySerial.read());// Hard serial print after reading soft serial byte, here its printing "-1"
Serial.print('A'); //Hard serial print "A"

mySerial.print('H'); // soft serial print
char read_char = mySerial.read();// pushing into variable after soft reading
delay(1000); // wait for 1 second

if(read_char == 'H') // if soft serial read byte = H
{
Serial.println("Soft Serial is Working"); // hard serail prints
}
}

8

Try changing this

SoftwareSerial mySerial(10,11);

to this

SoftwareSerial mySerial(6, 7);
9

Hackscribble:
Try changing this

SoftwareSerial mySerial(10,11);

to this

SoftwareSerial mySerial(6, 7);

Thanks for the support, But its not working.
tried
SoftwareSerial mySerial(6, 7)

Trial 3
shorted D10, D11

Trial 4
Shorted D6,D7

output is same as previous : -1A-1A-1A-1A .....

10

Hi sreenivas

I should have realised this sooner, but you cannot send and receive simultaneously with SoftwareSerial. So your loop test will miss the data sent.

There is information on this page:

https://code.google.com/p/arduino/issues/detail?id=1111

As PaulS asked, how do you want to use SoftwareSerial in practice? What is the Nano talking to? I assume the loop test was just to try out SoftwareSerial?

Regards

Ray

11

Hackscribble:
Hi sreenivas

I should have realised this sooner, but you cannot send and receive simultaneously with SoftwareSerial. So your loop test will miss the data sent.

There is information on this page:

Google Code Archive - Long-term storage for Google Code Project Hosting.

As PaulS asked, how do you want to use SoftwareSerial in practice? What is the Nano talking to? I assume the loop test was just to try out SoftwareSerial?

Regards

Ray

Thanks friends for your support....
I planned to use hard serial for for machine (which has UART) & soft serial for printer.

12

soft serial for printer

That should be one direction only (assuming no flow control characters back from the printer)? In which case, should work OK.