App Inventor issue receiving data from arduino nano through bluetooth

[Julio]

I am creating a thermostat application , it will send to arduino nano the desired temperature (selected from slider) , turn on/off through 2 buttons) and receive every 1 second from arduino the status ( runing,off or off) and the meassured temperature.

Actually I tried to receive a fixed string sent by Arduino but it is receiving bad , example I sent from arduino "Hello" and at a text label a seeing "H" and after "ello".

If I change the IntervalTimer at clock event iI can see "elloH" or "elloHello" or any combination of that but never the correct word.

the arduino script is very simple:

#include <SoftwareSerial.h>

SoftwareSerial mySerial(4, 5); // RX, TX

void setup()

{

   // set the data rate for the SoftwareSerial port

  mySerial.begin(9600);

}

void loop() // run over and over

{

    mySerial.write("Hello");

    delay(1000);

}

I`ll appreciate any help!!

Regards

Julio

[Abraham Getzler]

On the Arduino side, println() works better than write() for sending delimited text messages.

It adds a LF (decimal 10 line feed) to the end of the message, that can be specified in the AI2 BT client  designer Delimiter attribute = 10.

When you  have btresAvailable > 0 and are connected,

specifying a byte count of -1 in the BT Read Text block will give a full line of text.

text ReceiveText(number numberOfBytes)

Receive text from the connected Bluetooth device. If numberOfBytes is less than 0, read until a delimiter byte value is received.

from http://ai2.appinventor.mit.edu/reference/components/connectivity.html#BluetoothClient

ABG 

[Julio]

thanks a lot, now is working!!.

Regards

Julio