UNO & bluetooth problem

Projects Interfacing w/ Software on the Computer
1

hello,
I am newbie in electronic and arduino.
I am facing this problem for more than 1 week.

I hope someone can give me ideas on how to move forward.

My plan:
Using PC communicate with arduino UNO pin Tx & Rx via bluetooth.
Everything is good,
I can make use of hyperterminal to receive a looping counter value from arduino program.

But .....
I cannot send keystroke to arduino UNO. Just like a tutorial from arduino.cc
http://arduino.cc/playground/Learning/Tutorial01/

I try to type 'H' to turn on/off the LED on arduino UNO.

I am going to narrow down the problem.
Is it a bluetooth module problem?
Is it a Rx pin problem of UNO?

Pls. give me some advise.
How about this?
If I remove the bluetooth module, like using a USB<--> TTL cable,
connect the Tx pin to UNO Rx, Rx pin to UNO Tx pin.
Then, using hyperterminal to connect this com port.
Can i test the TxRx function of UNO?
Or, any other method that i can test on it?
Thank you.

2

I am going to narrow down the problem.
Is it a bluetooth module problem?
Is it a Rx pin problem of UNO?

More likely, the problem is the code you are running. Try looking at line 145.

Or post your code, so we can look at it.

3

here is my code :

Wiring code

char val; // variable to receive data from the serial port
int ledpin = 8; // LED connected to pin 48 (on-board LED)

void setup() {

pinMode(ledpin, OUTPUT); // pin 48 (on-board LED) as OUTPUT
Serial.begin(9600); // start serial communication at 9600bps

}

void loop() {

if( Serial.available() ) // if data is available to read
{
val = Serial.read(); // read it and store it in 'val'
}
if( val == 'H' ) // if 'H' was received
{
digitalWrite(ledpin, HIGH); // turn ON the LED
} else {
digitalWrite(ledpin, LOW); // otherwise turn it OFF
}
delay(100); // wait 100ms for next reading

}

4

Pls mind some BT modules have got "sleep" mode implemented (as mine did) - after 6secs of inactivity they go to sleep, waking up takes some time, so your characters are lost :frowning:

5

thanks to all

I finally re-config the baudrate of the bluetooth module. (Actually, i did it b4 but not success)

And problem solved.