Bluetooth

Development Boards Arduino
1

Help Please The following code returns !B11 fro iPhone button push. I’m just not sure what that is. It’s declared as an integer and I’d like to use an if then statement to see which button is pushed. Can someone help me.

/*

My Example 9/17/2018

*/

#include <SoftwareSerial.h>

int Str1, Str2;

int bluetoothTx = 2; // TX-O pin of bluetooth mate, Arduino D2

int bluetoothRx = 3; // RX-I pin of bluetooth mate, Arduino D3

SoftwareSerial mySerial(bluetoothRx, bluetoothTx); // Set up serial port to pins 2 TX and 3 RX

void setup() {

// Open serial communications and wait for port to open:

Serial.begin(9600);

while (!Serial) {

}

}

void loop() { // run over and over

if (mySerial.available()) {

Str1 = mySerial.read();

Serial.write(Str1);

//Serial.write(‘\n’); // Carriage Return

}

}

2

More simply if I have a string

Str1 = ‘ABCD’;

how do I reference B for example? For the life of me I can not figure this out.

3

Normally, Str1 would be a char array

char Str1[20]

or similar. And you would reference the second element as ```
char c = Str1[1]

4

  • More Specifically (I’m reading button pushes from my iPhone)

  • I’m using the BlueFruit App

The code I’m attaching sends back !B11:!B10; The !B11 is the button push and the !B10 is the button release.

When ever I try and put this into a string or store it so I can access each individual Byte I get nothing. You’ll see one of my attempts commented out in the code.

I’ve been stuck on this for 2 days and spent countless hours trying to get it to work, I think i’m just too stupid to figure it out and need help

Please!

/*

My Example 9/18/2018

*/

#include <SoftwareSerial.h>

char c;

String readString[10];

int bluetoothTx = 2; // TX-O pin of bluetooth mate, Arduino D2

int bluetoothRx = 3; // RX-I pin of bluetooth mate, Arduino D3

SoftwareSerial mySerial(bluetoothRx, bluetoothTx); // Set up serial port to pins 2 TX and 3 RX

void setup() {

Serial.begin(9600);

mySerial.begin(57600); // This was the speed it liked.

}

void loop() {

int i = 0;

if (mySerial.available()) {

delay(2);

c = mySerial.read();

Serial.print(c); // This information is fine c contains the current item from the buffer when done it stops

//readString = String(c);
i = i+1;
}
//Serial.println(readString[2,3]); // when included I get nothing…
//delay(2000);
}

5

Also each button sends a different group of characters on byte at a time stored in the buffer. So for example I want to move forward when !B11 is sent and stop when !B10 or the button is released. Then Let’s say another Button sends !B41 is sent when that button is pushed and !B40 when released. Therefore having the latest button sequence stored allows me to compare each term and assign movements to robots.

Thank you to anyone how can help me…

6

I think I’ve figured it out. It’s something to do with the difference in me using an if statement rather than a while statement. In other words in the above I used

if (mySerial.available()) {

.

.

.

}

If I change that to:

while (mySerial.available()) {

.

.

.

}

the variables do not change. Maybe someone could be kind enough to explain that one to me.

7

Yes I just ran my test and that is the solution. I will post my final code tomorrow when I wrap it up.

8

Good to know that you sort it out. Yeah share the final code here , it will help others having similar issues. :slight_smile:

9

Ok I have it working pretty good. I have a video too here: https://www.youtube.com/watch?v=YBieM-_nFbw

here is the code I used, very simple. Perfect for kids. I’m working on doing this with a Balboa now.

/*

My Example 9/17/2018

*/

#include <SoftwareSerial.h>

#include <Servo.h>

Servo myservo1, myservo2;

char c;

String readString[10];

int MyInt1, State1, State2;

int bluetoothTx = 2; // TX-O pin of bluetooth mate, Arduino D2

int bluetoothRx = 3; // RX-I pin of bluetooth mate, Arduino D3

SoftwareSerial mySerial(bluetoothRx, bluetoothTx); // Set up serial port to pins 2 TX and 3 RX

void setup() {

myservo1.attach(9); // Continuous tern servos

myservo2.attach(10); // Continuous tern servos

Serial.begin(9600);

State1 = 0;

digitalWrite(13,LOW); // Lights out

while (!Serial) {

}

mySerial.begin(57600); // This was the speed it liked.

}

void loop() { // run over and over to get the button presses

int i = 0;

while (mySerial.available()) {

delay(2);

c = mySerial.read();

if (c != ‘\n’){

readString[ i ] = String(c);

i = i + 1;

}

}

// Now make the robot move in accordance with the button presses

// Full Stop

if (readString[3] == String(‘0’)){

digitalWrite(13,LOW);

//Serial.write(“S”);

State1 = 1;

myservo1.writeMicroseconds(1500); // Make Servo Stop Moving

myservo2.writeMicroseconds(1500); // Make Servo Stop Moving

}

// Full Forward

else if(readString[2] == String(‘5’)){

digitalWrite(13,HIGH);

//Serial.write(“F”);

myservo1.writeMicroseconds(2000); // Make Servo Move

myservo2.writeMicroseconds(1000); // Make Servo Move

}

// Right Turn

else if(readString[2] == String(‘8’)){

digitalWrite(13,HIGH);

//Serial.write(“R”);

myservo1.writeMicroseconds(2200); // Make Servo Move

myservo2.writeMicroseconds(1700); // Make Servo Move

}

// Left Turn

else if(readString[2] == String(‘7’)){

digitalWrite(13,HIGH);

//Serial.write(“L”);

myservo1.writeMicroseconds(1300); // Make Servo Move

myservo2.writeMicroseconds(800); // Make Servo Move

}

// Backwards

else if(readString[2] == String(‘6’)){

digitalWrite(13,HIGH);

//Serial.write(“B”);

myservo1.writeMicroseconds(1000); // Make Servo Move

myservo2.writeMicroseconds(2000); // Make Servo Move

}

}

// An that’s it