bluetooth - Characters not properly displayed in serial monitor in arduino -

can tell me why characters not getting printed in serial monitor of arduino? pasting arduino code.

#include <softwareserial.h>   #include <liquidcrystal.h>      // initialize library numbers of interface pins        liquidcrystal lcd(12,11,5,4,3,2);       int bluetoothtx = 15;       int bluetoothrx = 14;          softwareserial bluetooth(bluetoothtx, bluetoothrx);           int incomingbyte;           void setup() {          pinmode(53, output);          serial.begin(9600);            lcd.begin(16, 2);            lcd.clear();            bluetooth.begin(115200);        // bluetooth mate defaults 115200bps             delay(320);                     // important delay! (minimum ~276ms)              bluetooth.print("$$$");         // enter command mode              delay(15);                      // important delay! (minimum ~10ms)                 bluetooth.println("u,9600,n");  // temporarily change baudrate    9600, no parity                 bluetooth.begin(9600);          // start bluetooth serial @ 9600                  lcd.print("done setup");                 }                  void loop()                    {                     lcd.clear();                      serial.print("in loop");                    //read bluetooth , write usb serial                     if(bluetooth.available()) {                     serial.print("bt here");                     char tosend = (char)bluetooth.read();                      serial.print(tosend);                         lcd.print(tosend);                        delay(3000);                      }delay(3000);           } 

can take it. not print character provide instead prints else 'y' 2 dots on top etc. tried available solution.

your issues 1 of couple things. first , easiest check common ground. did connect rx , tx pins or gnd (ground) pin? make sure ground bt mate connected arduino ground.

if have done that, issue baud rate. i'm pretty sure softwareserial can't read @ baud rates beyond 57600. arduino.cc docs can read @ 115200, other places write 115200.

to test this, either need change settings on bluetooth mate or use mega or leonardo have hardware serial port (other 1 used usb) should able configure 115200.

if try hardware serial either on mega or using ftdi or , messages still garbled perhaps bluetooth mate not configured talk @ 115200 claims. trying reading docs or testing other baud rates.