Reputation: 1
The Goal:
To have the ardiuno check if it's connected to the android with bluetooth. Then to perform an act if it is connected or reconnect if it's not connected.
What I am using:
Bluesmirf silver with arduino uno and note 3
What I've done so far:
[ARDUINO CODE]
The Bluesmirf is in master mode auto connect. The arduino is supposed to check if the android app is sending an H character. If it is that means its connected. If not then it needs to keep re-connecting.
#include <SoftwareSerial.h>
#include <TextFinder.h>
int bluetoothTx = 2; // TX-O pin of bluetooth mate, Arduino D2
int bluetoothRx = 3; // RX-I pin of bluetooth mate, Arduino D3
boolean running = false;
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);
void setup()
{
Serial.begin(9600); // Begin the serial monitor at 9600bps
bluetooth.begin(115200); // The Bluetooth Mate defaults to 115200bps
bluetooth.print("$"); // Print three times individually
bluetooth.print("$");
bluetooth.print("$"); // Enter command mode
delay(100); // Short delay, wait for the Mate to send back CMD
bluetooth.println("U,9600,N"); // Temporarily Change the baudrate to 9600, no parity
delay(100);
bluetooth.begin(9600); // Start bluetooth serial at 9600
}
void loop()
{
//Check If Connected
if(bluetooth.available()) // If the bluetooth sent any characters
{
//Check if bluetooth recieved an H and store in a value
char val = bluetooth.read();
if(val == 'H')
{
running = true;
}
else if(val != 'H')
{
running = false;
}
}
else if(!bluetooth.available())
{
running = false;
}
//Actions to perform if arduino is connected or not connected
if(running == true)
{
//It's connected so wait 5 seconds
delay(5000);
}
else if(running == false)
{
//It's not connected: Attempt to reconnect
bluetooth.print("$"); // Print three times individually
bluetooth.print("$");
bluetooth.print("$"); // Enter command mode
delay(100); // Short delay, wait for the Mate to send back CMD
bluetooth.println("C,30196692D7C0");
delay(500);
bluetooth.println("---");
delay(3000);
}
}
[ANDROID CODE]
And this is the method of the android app that sends an H once the app is connected.
private void sendMessage(BluetoothSocket socket, String msg) {
OutputStream outStream;
try {
outStream = socket.getOutputStream();
byte[] byteString = (msg).getBytes();
outStream.write(byteString);
} catch (IOException e) {
Log.d("BLUETOOTH_COMMS", e.getMessage());
}
}
Side Note:
I've tried so many things to get this arduino to check if its connected or not. I only just started programming 3 weeks ago so this is becoming increasingly difficult. Any help would be appreciated.
Upvotes: 0
Views: 2584
Reputation: 1
[UPDATE #1]
I've managed to send an 'h' with the android app with this snippet here:
//call send method to send this character over bluetooth
sendMessage(socket,"h");
//Method used to send 'h' over bluetooth
private void sendMessage(BluetoothSocket socket, String msg) {
OutputStream outStream;
try {
outStream = socket.getOutputStream();
//byte[] byteString = (msg).getBytes();
byte[] byteString = stringToBytesUTFCustom(msg);
outStream.write(byteString);
} catch (IOException e) {
Log.d("BLUETOOTH_COMMS", e.getMessage());
}
}
//Method used to convert
public byte[] stringToBytesUTFCustom(String str) {
char[] buffer = str.toCharArray();
byte[] b = new byte[buffer.length << 1];
for (int i = 0; i < buffer.length; i++) {
int bpos = i << 1;
b[bpos] = (byte) ((buffer[i]&0xFF00)>>8);
b[bpos + 1] = (byte) (buffer[i]&0x00FF);
}
return b;
}
And with arduino I can properly read the 'h' using this snippet.
if (bluetooth.available() > 0) { // if the data came
char incomingByte = bluetooth.read(); // read byte
if(incomingByte == 'h') {
running = true;
}
}
New Problem
I am having trouble telling when the arduino has lost connection with the android app.
Upvotes: 0