Hi.
my project has problem about bluetooth connection (multiple) with arduino.
In my project, 3 'arduino pro mini boards'(hereinafter referred to as the "Board") and 4 HC-05 bluetooth modules are used.
I had want to connect one master bluetooth module with two slave module before.
But I soon found out that 'HC-05' was not having 1:n connection function.
Therefore, i had decided to use 2:2 bluetooth connection as shown in attach image file 'circuit'.
And actually, it was almost done.
When i confirm that 1:1 connection between each slave and master, each slave had been send character signal ('A') well to each master.
But, problem was appeared when i control two masters at the same time.
in my code, master board could receive data from slave 2 only when 'bluetooth1.begin(9600)' was declared after 'bluetooth2.begin(9600)'
on the contrary, master board could receive data from slave 1 only, if 'bluetooth2.begin(9600)' was declared after 'bluetooth1.begin(9600)'
I tried to search for some examples of 2:2 Bluetooth communication or 1:n communication, but I couldn't find a suitable example.
But I can't find the right solution, i decide to asking for help to arduino forum.
Attached are the associated codes.
Master's board code
#include <SoftwareSerial.h>
SoftwareSerial bluetooth1(3,4);
SoftwareSerial bluetooth2(11,10);
#define LEDpin1 5
#define LEDpin2 6
char data1;
char data2;
void setup(){
pinMode(LEDpin1, OUTPUT);
Serial.begin(9600);
bluetooth1.begin(9600);
bluetooth2.begin(9600);
}
void loop(){
if(bluetooth1.available() > 0){
data1 = bluetooth1.read();
Serial.print("data1 = ");
Serial.println(data1);
if(data1 = 'A'){
digitalWrite(LEDpin1,HIGH);
delay(200);
digitalWrite(LEDpin1,LOW);
}
}
else if(bluetooth2.available() > 0){
data2 = bluetooth2.read();
Serial.print("data2 = ");
Serial.println(data2);
if(data2 = 'A'){
digitalWrite(LEDpin2,HIGH);
delay(200);
digitalWrite(LEDpin2,LOW);
}
}
}
Slave 1's board code
#include <SoftwareSerial.h>
SoftwareSerial bluetooth1(3,4); //slave1
#define button 2
char clicked = 'A'; // SLAVE1
unsigned long pre_time = 0;
unsigned long cur_time = 0;
const int duration = 30 ;
void setup(){
pinMode(button, INPUT_PULLUP);
Serial.begin(9600);
bluetooth1.begin(9600);
attachInterrupt(digitalPinToInterrupt(button), CLICKED, RISING);
}
void loop(){
}
void CLICKED(){
cur_time = millis();
if(cur_time - pre_time >= duration) {
bluetooth1.write(clicked);
Serial.write(clicked);
pre_time = cur_time;
}
}
Slave 2's board code
#include <SoftwareSerial.h>
SoftwareSerial bluetooth2(11,10); // slave2
#define button 2
char clicked = 'A'; // SLAVE2
unsigned long pre_time = 0;
unsigned long cur_time = 0;
const int duration = 30 ;
void setup(){
pinMode(button, INPUT_PULLUP);
Serial.begin(9600);
bluetooth2.begin(9600);
attachInterrupt(digitalPinToInterrupt(button), CLICKED, RISING);
}
void loop(){
}
void CLICKED(){
cur_time = millis();
if(cur_time - pre_time >= duration) {
bluetooth2.write(clicked);
Serial.write(clicked);
pre_time = cur_time;
}
}
