Using HC-08 bluetooth module with arduino

Question

I have an arduino mega 2560 and a recently purchased HC-08 module and the connection is as the following:

Arduino | HC-08

VCC - VCC

GND - GND

14TX3 - TXD

15TX3 - RXD

When I power up the arduino it shows that flashing light and I am able to see it on my android phone but would only reject the connection every time I tried to pair. Also I am not able to send or receive any data from it at all, here is my code:

#include <SoftwareSerial.h>

SoftwareSerial hc08(15,14) // RX pin, TX pin;

void setup(){
  //Initialize Serial Monitor
  Serial.begin(9600);
  Serial.println("ENTER AT Commands:");
  //Initialize Bluetooth Serial Port
  hc08.begin(9600);
}

void loop(){
  //Write data from HC08 to Serial Monitor
  if (hc08.available()){
    Serial.println("Reading from bluetooth");
    Serial.write(hc08.read());
  }
  
  //Write from Serial Monitor to HC08
  if (Serial.available()){
    Serial.println("Writing to bluetooth");
    hc08.write(Serial.read());
  }  
}

I'd really appreciate help on how to get it working.

Don't use SoftwareSerial when you're using the hardware serial pins. For TX3/RX3 use Serial3. In fact, on the 2560 don't use SoftwareSerial at all - there's only certain select pins it will work on. — Majenko
– Majenko, Commented Aug 25, 2020 at 9:45
Could you send a link to any documentation of this so I can see how to use Serial3 — Wool
– Wool, Commented Aug 25, 2020 at 10:02
I've now seen I can just use Serial1, 2 or 3 just like I would use Serial. Thanks — Wool
– Wool, Commented Aug 25, 2020 at 10:05
But there still is the problem with the pairing being rejected. — Wool
– Wool, Commented Aug 25, 2020 at 10:10
But now you should be able to see and control the HC-08 through the Arduino to configure the pairing - however that's done on that board (I've never used one). — Majenko
– Majenko, Commented Aug 25, 2020 at 10:26

Wool · Accepted Answer · 2020-08-25 10:07:02Z

1

void setup(){
  //Initialize Serial Monitor
  Serial.begin(9600);
  Serial.println("ENTER AT Commands:");
  //Initialize Bluetooth Serial Port
  Serial3.begin(9600);
}

void loop(){
  //Write data from HC08 to Serial Monitor
  if (Serial3.available()){
    Serial.println("Reading from bluetooth");
    Serial.write(Serial3.read());
  }
  
  //Write from Serial Monitor to HC08
  if (Serial.available()){
    Serial.println("Writing to bluetooth");
    Serial3.write(Serial.read());
  }  
}

answered Aug 25, 2020 at 10:07

Wool

211 silver badge3 bronze badges

ALSO: the HC-08 uses BLE, unlike the HC-05 and HC-06 and so won't exactly connect through the phone's system bluetooth settings.

Wool
– Wool

2020-08-25 20:01:39 +00:00
Commented Aug 25, 2020 at 20:01

Add a comment |

Jordan · Accepted Answer · 2021-01-26 00:07:17Z

1

I think this is the problem on the hardware setting. It should be: Arduino | HC-08

VCC - VCC

GND - GND

14RX3 - TXD

15TX3 - RXD

Variable declare: SoftwareSerial hc08(14,15) // RX pin, TX pin;

answered Jan 26, 2021 at 0:07

Jordan

111 bronze badge

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