dfrobot v3 bluetooth module

Projects Networking, Protocols, and Devices
1

hi,
i've bought a dfrobot v3 bluetooth module to connect to arduino MEGA 2560.
i was able to connect it to Arduino using TX and RX pins and to connect it to an android smartphone.
Then i used the serial monitor to communicate with smartphone.

The Serial monitor was able to send letters to the smartphone, but when i tried to send letters by smartphone to serial monitor it didn't receive anything.

connection: pin 16 (TX2) to RX module
pin 17(RX2) to TX module
BAUD RATE: 9600
i even tried to switch RX and TX pins, but it doesn't communicate on both sides.

can someone please help me?

2

trovez:
i was able to connect it to Arduino using TX and RX pins and to connect it to an android smartphone.
.........
i even tried to switch RX and TX pins, but it doesn't communicate

I guess you have now concluded that switching the pins was as about the most futile thing you could ever gave done. Since your code is a state secret, the best guess is that you have a serial input problem, so try here. It may be that you are simply listening on the wrong port.

You might also find the following background notes useful.

3

Hi Nick,
the code i used is one of the many code examples for bluetooth communication.

#include <SoftwareSerial.h>

SoftwareSerial SSerial(17, 16); //17 RX e 16 TX
int i = 1;
char a;
void setup() {
Serial.begin(38400);
while(!Serial) {}

Serial.println("ok");
SSerial.begin(38400);
}

void loop() {
if (SSerial.available()){
Serial.write(SSerial.read());
}

if (Serial.available()){
SSerial.write(Serial.read());
}
}

thanks for the advice. I'll read the post you have linked

4

trovez:
the code i used is one of the many code examples for bluetooth communication.

#include <SoftwareSerial.h>

SoftwareSerial SSerial(17, 16); //17 RX e 16 TX

Clearly junk code, written by an idiot. Never run software serial on hardware serial pins, and I bet you have no good reason for running software serial on a Meg anyway, and probably never will.

5 
 SSerial.begin(38400);

Why do you believe that the module when in data mode is set for 38400 baud and not 9600?