Could you tell me how to read analog data from arduino using this library?

[VigneshVelmurugan]

I have tried different solutions from the internet to achieve this using this library but I have only been able to go as far as establishing a connection. I have not been able to read the incoming data.

[VigneshVelmurugan]

void onBluetoothDataEvent(String who, byte[] data) { String Str = new String(data); println(Str);

//background(int(Str)); } Nothing gets printed on the console, even though arduino is transmitting.

[EmmanuelPil]

Hi. Are you using Android PC or APDE? Of course Bluetooth permissions are enabled? What Android version are you using?

[VigneshVelmurugan]

Hi. Are you using Android PC or APDE? Of course Bluetooth permissions are enabled? What Android version are you using?

Hey, Thank you. I am using Android 10. I have enabled all Bluetooth permissions and am writing the code on the processing IDE on PC in android mode.

[EmmanuelPil]

I believe (seeing this code), you are following this topic on the forum. Would you like to enter the conversation there? Anyway, one thing you can try is to give a large interval on the Arduino side, like delay(100); between each write() command. Without seeing the whole code it's difficult to opinion, Did you use bt.start(); ?

[VigneshVelmurugan]

Thank you for the help. Yea I did everything as above but I am now getting strange characters when I print in console.

My arduino code: int index_angle; void setup() { // put your setup code here, to run once: Serial.begin(9600); }

void loop() { // put your main code here, to run repeatedly: index_angle = map(analogRead(A0),0,1023,0,180); Serial.println(index_angle); delay(2); }

Processing: import ketai.net.bluetooth.*; import android.os.Bundle; //String device_name = "BT04-A";

KetaiBluetooth bt;

void setup() { fullScreen(); orientation(PORTRAIT); bt.getPairedDeviceNames(); //bt.connectToDeviceByName(device_name); bt.connectDevice("00:14:03:05:EF:5D"); bt.start(); }

void draw() { //background(int(Str)); }

void onBluetoothDataEvent(String who, byte[] data) { String Str; Str = new String(data); println("Value Received"+Str); //println(Str); } void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); bt = new KetaiBluetooth(this); }

Console: BUILD SUCCESSFUL in 38s 28 actionable tasks: 28 executed Found onBluetoothDataEvent method. BEGIN mConnectThread SocketType:Secure:DSD TECH HC-05 Found onBluetoothDataEvent method. Socket Type: SecureBEGIN mAcceptThreadThread[Thread-4,5,main] AcceptThreadSecure KBTConnect thread connected! create Connection thread to DSD TECH HC-05 BEGIN mConnectedThread to 00:14:03:05:EF:5D Value Received�������������������� Value Received� Value Received� Value Received� Value Received� Value Received� Value Received� Value Received� Value Received� Value Received� Value Received� Value Received�

[VigneshVelmurugan]

I also tried with delay(200) in arduino but got the same results.

[VigneshVelmurugan]

I finally got it to work. Thank you. It worked after further increasing the delay to 1000

[EmmanuelPil]

If an interval of 1 second is acceptable, then that's fine. The data array string can vary much in length, depending on the speed the Arduino is sending. In part caused by Bluetooth’s channel frequency-hopping, it comes in chunks from a few bytes to hundreds of bytes at once. So you have to split the incoming string accordingly like: "for (String ts : Str.split("!")) {" (Use "mySerial.print('!');" instead of "println();") Also you need to read the characters before the first '!' in the string and the characters after the last '!' character and dismiss them because the maybe only a part of the actual value. This way you will lose some bytes, but that not much, and you can use a small delay. Readings without a loss are also possible, but you'll need a more complex String handling.