Problem transmission Mega 2560 R3 and Bluetooth Parani SD200

Projects Networking, Protocols, and Devices
1

Hi all
I try to connect sd200 - mega 2560 as:

SD200 - Mega2560 :

Tx(2) - Rx1(19)
Rx(3)- Tx1(18)
GND(5)- GND
VCC(9)- 5V(arduino)

after connect Rx led on SD200 always on , this mean TX0(18) on arduino is HIGH value ( this status is correct or not ?)

I try use simple code :

void setup() {
Serial.begin(9600);
Serial1.begin(9600);
}
void loop() {
if (Serial1.available()) {
Serial.write(Serial1.read());
}
if (Serial.available()>0)
{
Serial1.write(Serial.read());

}
}

my problem : when I send character form mobile phone to Arduino via Bluetooth I received miss character on Serial monitor on PC.

PS: I already try transmission between mobile phone and SD200 via serial port of PC (hyper teminal) everthing OK.

Any body can help me whats problem in my case
Thanks all!

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2

You say you are connected to

tuninh:
Tx(2) - Rx0(19)
Rx(3)- Tx0(18)

but Rx0 is pin 0 and Tx0 is pin 1. If you connect it up to the proper pins, it might work.

3

Sorry I miss typing Tx1, Rx1

4

The code is junk anyway, and doesn't compile.

Try this

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino

and work your way to two channels from there

5

@Nick_Pyner
thanks for you help!
Between PC(serial monitor) and arduino is no problem , only problem mistake character when transmission from Bluetooth to any hardware serial port on arduino .
BTW: how about my Rx led on Bluetooth it away on event arduino not send any to Bluetooth, when i plug this Bluetooth to Serial port on PC normal Rx,Tx led is off , only flash when transfer data.

Nick_Pyner:
The code is junk anyway, and doesn't compile.

Try this

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino

and work your way to two channels from there

6

tuninh:
Between PC(serial monitor) and arduino is no problem

I can only assume you are using a different programme for this. The code you posted will not compile and therefore cannot be used. That is, with IDE v1.0.1 but that is probably irrelevant. I cannot comment on the hardware as I don't know anything about it.. The devices I use only flashes when there is no connection.

7

void setup() {
Serial.begin(9600);
Serial1.begin(9600);
}
void loop() {
if (Serial1.available()) {
Serial.write(Serial1.read());
}
if (Serial.available()>0)
{
Serial1.write(Serial.read());

}
}

I try very simple code try to check
Serial port send & received from my laptop is OK
but Serial1 send & received from mobi phone via Bluetooth like this: "y=W+•…??Õå]y=y=^X¬¬W]ý"

I use IDE V1.5.6 beta version. ( old version same problem)

[/quote]

I can only assume you are using a different programme for this. The code you posted will not compile and therefore cannot be used. That is, with IDE v1.0.1 but that is probably irrelevant. I cannot comment on the hardware as I don't know anything about it.. The devices I use only flashes when there is no connection.
[/quote]

8

What sort of mobile phone are you using?

Please don't tell me it's an iPhone.

The code complies kosher but I recommend you stick to one port Rx0,Tx0 both ways as I outlined.

9

I use "BT teminal" on windows phone this software work perfect when I connect SD200 to PC ( hyperterminal).
I also try on Rx0 and Tx0 same problem,

I try to check Tx pin, keep on 4.5V (high) after Serial1.begin(); this normal or not?

Nick_Pyner:
What sort of mobile phone are you using?

Please don't tell me it's an iPhone.

The code complies kosher but I recommend you stick to one port Rx0,Tx0 both ways as I outlined.

10

Did you connect the same bluetooth to a PC and then you able to talk two way via bluetooth to your windows phone?
If so, I guess this confirms that the SD200 is OK with a windows phone and there is nothing fundamentally wrong with the phone or the SD200.

Try running the single channel code I mentioned.

11

windows phone > SD200 > PC (hyperterminal) can talk two way, send & received OK.
Arduino > PC (serial monitor) two way talk OK.

single chanel code also try but same problem.

Nick_Pyner:
Did you connect the same bluetooth to a PC and then you able to talk two way via bluetooth to your windows phone?
If so, I guess this confirms that the SD200 is OK with a windows phone and there is nothing fundamentally wrong with the phone or the SD200.

Try running the single channel code I mentioned.

12

tuninh:
I try to check Tx pin, keep on 4.5V (high) after Serial1.begin(); this normal or not?

I'm afraid I'm lost with this one. I would have expected 5v on the pin but I would not think 4.5v is a problem.