trying to get reading from Bluetooth adapter

Hi everyone,

Im trying to get readings from my bluetooth adapter (HC06) on my Arduino Micro.
ive got a very simple code but im only getting “-1” om my serial monitor. does someone has a clue why this is happening?

#include <SoftwareSerial.h>

int bluetoothTx = 7;
int bluetoothRx = 8;
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);

void setup()
{

  //Setup usb serial connection to computer
  Serial.begin(9600);
  //Setup Bluetooth serial connection to android
  bluetooth.begin(9600);
}

void loop()
{
  Serial.println(bluetooth.read());
}

PS. i've got an adroid app that should send out values from 1000-3255

meanduck:
PS. i've got an adroid app that should send out values from 1000-3255

That sounds like just the sort of thing everybody needs.

You might find the following background notes useful

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

Have a look at this example:

-1 is the return value from read() function when there is nothing in the port to read.

-1 is the return value from read() function when there is nothing in the port to read.

Testing that there is data to read, BEFORE reading, will get rid of the pesky -1.

Hi Guys!

so ive managed to get some data.

if I send a 1bytenumber with my android app (appinventor2.0) it works great. ill get a number from 0-255 (more won’t fit in a single byte so thats an issue).
but when i try to send it as a 2bytenumber, 4bytenumber or text I get 3 lines on my serial monitor instead of one single line with one number.
for example:
3
7
6
what I want:
376

does anybody know why this is happening and how i can fix it?

Thnaks in advance :slight_smile:

Tymen

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX


void setup()  
{
  // Open serial communications and wait for port to open:
  Serial.begin(19200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
pinMode(13, OUTPUT);



  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
}


void loop() // 
{
while(mySerial.available()){
    delay(10);
    char text = mySerial.read();
    Serial.println(text);
  }

does anybody know why this is happening

Your Android code and you Arduino code make this happen. You seem to have forgotten to post either one.

and how i can fix it?

A 10 lb. sledgehammer.

Since you did post the code, after I commented...

You clearly expect to read the data as text. So, clearly the Android is sending the value as text.

You might want to take a peak at the manual for parseInt().

Why don't you use the free hardware Serial on the Micro?

@ paul : here u go!

@ Paul : I also found out that Serial only take 1 byte at a time. so that why its acting so wierd on 2/4/text.
so i figured i need to use the buffer, but i havent figured out how. first time im using this function.

@Whandall: each time i want to upload a new code i have to unplug and plug the BT module. its a pain... so im using the software serial instead.

first time im using this function.

Using which function?

Serial Input Basics - Updated

meanduck:
@Whandall: each time i want to upload a new code i have to unplug and plug the BT module. its a pain... so im using the software serial instead.

You don't have to do that on a Micro, it has a seperate hardware Serial.

Serial goes to upload and USB,
Serial1 goes to the free rx and tx pins.

In addition, some pins have specialized functions:

Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data using the ATmega32U4 hardware serial capability. Note that on the Micro, the Serial class refers to USB (CDC) communication; for TTL serial on pins 0 and 1, use the Serial1 class.

PaulS:
Using which function?

Serial Input Basics - Updated

buffering your serial input so i cant get multiple bytes of data in to one var. I keep getting multiple lines for one push of data. and i do not know how to get this in to one variable.

i tried this tutorial (Arduino Tutorial # 4.5: Better Serial Parsing - YouTube), but i still get this on my Serial monitor:
P
I
N
O
N

1
3


i created a button in AppInventor that sends "PINON 13" as TEXT.

i tried this tutorial

I'm not watching a movie to see some code. You already watched it, and stole, or typed, the code. Post it here.

You CAN collect data in an array, as Robin2's tutorial (that I posted a link to) shows.

i think i got the solution.

ive made a string var and put the serial data in there. but i also change "mySerial.read" to "mySerial.readString"

and now i get readble and expected values.

thanks for helping though!