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POArduino: using Serial and Software Serial with bluetooth module
 

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  1. POArduino: using Serial and Software Serial with bluetooth module
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    <p>My purpose is to use Arduino to set up communication between a PC and an Android device using an HC-05 bluetooth module.</p> <p>I use the USB communication between the PC and the Arduino (Serial Monitor) and a SoftwareSerial to connect to the HC-05.</p> <p>My problem is that the communication works well from BT to the PC, but doesn't work as expected in the other way. When sending from the PC to BT all the characters sent are received by the BT device only when I close the Serial Monitor on the PC or when I reset the Arduino.</p> <p>I've excluded a problem with the BT Module or the Android application because if in Arduino I implement an "ECHO" code (write in Android and the send in Android) everything works fine.</p> <p>With the Arduino code posted below the expected behaviour is: Arduino reset-> Hello word sent, Serial monitor opened-> nothing happens, character written on serial monitor-> character received on BT, character written on BT-> character received on Serial Monitor, Serial monitor closed-> nothing happens.</p> <p>The real behaviour is: Arduino reset-> Hello word sent, Serial monitor opened-> 2 Hello word on BT and 1 ("goodnight") on PC, character written on serial monitor-> nothing, character written on BT-> character received on Serial Monitor, Serial monitor closed-> previous written character(s) in serial monitor received + Hello Word.</p> <p>How can I fix this problem?</p> <p>Code:</p> <pre><code>#include &lt;SoftwareSerial.h&gt; SoftwareSerial mySerial(2, 3); // RX, TX int a=0; char c; char d; void setup() { Serial.begin(9600); Serial.println("Goodnight moon!"); mySerial.begin(9600); mySerial.println("Hello, world?"); } void loop() { delay(10); if (Serial.available()) { c=Serial.read(); delay(10); Serial.write(c); } delay(10); if (mySerial.available()) { d=mySerial.read(); delay(10); mySerial.write(d); } } </code></pre>
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    1. COHave you tried using different pins for the softwareserial? Not all pins are supported depending on which board you are using: http://arduino.cc/en/Reference/SoftwareSerial
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    2. COThank you for your suggestion, I am using an Arduino Uno so there shouldn't be any problem but I tried it anyway, same result. Note that sending and receiving only through BT works, the problem occurs only when using USB Serial Port side by side with BT.
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    3. COHave you tried different baudrates? Are you using the right port in the Arduino IDE?
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