Arduino Bluetooth

[Brown]

So I was playing around with the HC-05 BT module and MIT App Inventer 2. I'm trying to make Arduino Pins toggle HIGH/LOW.

When my Arduino code request a "0" I have to sent a "48" in App Inventor
When my Arduino code request a "1" I have to sent a "49" in App Inventor
When my Arduino code request a "2" I have to sent a "50" in App Inventor
When my Arduino code request a "3" I have to sent a "51" in App Inventor
When my Arduino code request a "4" I have to sent a "52" in App Inventor
When my Arduino code request a "5" I have to sent a "53" in App Inventor
and so on

Why can't I send a "1" in App Inv. and request a "1" in Arduino. Is there some sort of conversion?
Thanks

Code:

#include <SoftwareSerial.h>

SoftwareSerial Brown(10, 11); // RX  TX
int ledpin=13;
int BluetoothData;

void setup() {
 
  Brown.begin(9600);
  Brown.println("Bluetooth On please press 1 or 0 blink LED ..");
  pinMode(ledpin,OUTPUT);
}

void loop() {

       if (Brown.available()){
BluetoothData=Brown.read();
   if(BluetoothData=='0'){   
   digitalWrite(ledpin,1);
   Brown.println("LED  On D13 ON ! ");
   }
  if (BluetoothData=='1'){
  digitalWrite(ledpin,0);
   Brown.println("LED  On D13 Off ! ");
  }
}
delay(100);
}

[jancumps]

Hi,

You are getting the ascii value.

http://www.asciitable.com/

Check if you can use itoa()

[Brown]

Ohhhh, Thanks! Thank you so much!

[jancumps]

The example sketch Strings - CharacterAnalysis shows how to interprete different types of input.
And don't use the itoa() suggestion from me above. It is num to string.

[Brown]

Thanks, do you also know a way to send data from arduino to android using App Inv. ?

[zapta]

I am not familiar with app inventor but probably you send data in the opposite direction just the same.

Try something like Brown.read("1") and see if you can read the serial data on the android side.

BTW, you can also try to debug it from a computer with bluetooth adapter. Pair with the arduino bt and see if you can access the bt/spp port on the computer with a terminal program. This way you will see what the arduino sends and you can type back commands.

[kolonelkadat]

lol the first answer was SO close to being right

look at your code

Code: [Select]

if(BluetoothData=='0'){   
'0' means the char value of 0 which is 48(0x30)

if you want the integer value for 0 (0x0) then do NOT use the single quotes around the number

the correct code would be

Code: [Select]

if(BluetoothData == 0){   

[Brown]

Thank you Kolonelkadat, Zapta, and Jancumps

Zapta I tried Brown.read but it didn't work then I thought of Brown.write and it WORKED.

Thanks you guys!

[zapta]

Thank you Kolonelkadat, Zapta, and Jancumps

Zapta I tried Brown.read but it didn't work then I thought of Brown.write and it WORKED.

Thanks you guys!

Oops, I meant 'write' since you already use 'read' in the other direction. I am glad that you figured it yourself.