ATtiny85 - Bluetooth

Intro: ATtiny85 - Bluetooth

In the last instructable I showed you how to program an ATiny85, in this instructable I will show you how to start serial communication with the ATiny85 over a Bluetooth network. For this instructable I will be using a HC05 Bluetooth module which can be purchased for cheap on eBay.

So lets get started....

STEP 1: Tools and Components

Here is what you need -

• Attiny84 or 85
• Bluetooth module
• A bread board
• Jumper wires

STEP 2: Circuit

Setup the connections between the ATiny and the Bluetooth as follows -

• Bluetooth Module Rx --> ATiny85 Pin 1
• Bluetooth Module Tx --> ATiny85 Pin 2
• Bluetooth Module Gnd --> ATiny85 Pin 4
• Bluetooth Module VCC --> ATiny85 Pin 8

STEP 3: Code

Here is a test sketch you can run, connect a led at 6 and upload the code. Sending 1 from a serial terminal will turn on the LED and sending 0 will turn it off.

#include    //Software Serial Port
#define RxD 1
#define TxD 2
#define DEBUG_ENABLED  1
 
SoftwareSerial blueToothSerial(RxD,TxD);
int led = 4;
 
void setup() 
{ 
  pinMode(RxD, INPUT);
  pinMode(TxD, OUTPUT);
  setupBlueToothConnection();
  
  pinMode(led,OUTPUT);
  digitalWrite(led,HIGH);
 
} 
 
void loop() 
{ 
  char recvChar;
  while(1){
    //check if there's any data sent from the remote bluetooth shield
    if(blueToothSerial.available()){
      recvChar = blueToothSerial.read();
      
        if(recvChar == '1')
          digitalWrite(led,HIGH);  
       
        else
          digitalWrite(led,LOW); 
    }
  }
} 
 
void setupBlueToothConnection()
{
  blueToothSerial.begin(9600); //Set BluetoothBee BaudRate to default baud rate 38400
  blueToothSerial.print("\r\n+STWMOD=0\r\n"); //set the bluetooth work in slave mode
  blueToothSerial.print("\r\n+STNA=HC-05\r\n"); //set the bluetooth name as "HC-05"
  blueToothSerial.print("\r\n+STOAUT=1\r\n"); // Permit Paired device to connect me
  blueToothSerial.print("\r\n+STAUTO=0\r\n"); // Auto-connection should be forbidden here
  
  delay(2000); // This delay is required.
  //blueToothSerial.print("\r\n+INQ=1\r\n"); //make the slave bluetooth inquirable 
  blueToothSerial.print("bluetooth connected!\n");
  
  delay(2000); // This delay is required.
  blueToothSerial.flush();
}

Comments

[MostafaSalahEldain]

#include <SoftwareSerial.h> //Software Serial Port

#define TxD 0 //pin 5 de l'ATtiny à relier au pin RXD du module bluetooth (pin5)

#define RxD 1 //pin 6 de l'ATtiny à relier au pin TXD du module bluetooth (pin4)

SoftwareSerial blueToothSerial(RxD,TxD);

int relais = 4; // pin 3 de l'ATtiny qui commande le relais

void setup()

{

pinMode(RxD, INPUT);

pinMode(TxD, OUTPUT);

blueToothSerial.begin(9600);

//delay(2000); // délai nécessaire

blueToothSerial.print("Bluetooth connecté !\n");

delay(4000); //Vérifie que tous les relais sont bien inactifs après un reset

pinMode(relais,OUTPUT);

digitalWrite(relais,LOW); // ouvre le relais

}

void loop()

{

char recvChar;

while(1) {

//vérifie s'il y a des données envoyées à partir du module bluetooth

if(blueToothSerial.available()){

recvChar = blueToothSerial.read();

if(recvChar == '1')

digitalWrite(relais,HIGH);

else

digitalWrite(relais,LOW);

}

}

}

[surinperies]

Thank you very much you resolved my problem

[RonT3]

Thanks for sharing. But please ensure codes are complete before sharing. Good Engineers always double check and triple check before delivering projects.

[BenitoB3]

i am trying with this library

#include <SoftSerial.h>

and... compiled!!

[loptica62]

the first line of code should read as follows:

#include <SoftwareSerial.h>

....I didn't get any compile error....

[tvikneshwar]

i am trying to make communication beteen attiny-85 and hc05 its not working bro plz help me

[Bullitt4511]

Well, something's missing. Where to hook up to Arduino?

[KevinW182]

The ATTiny85 IS the Arduino.

[IvanV52]

Any ideas on faster bitrate than 9600 ?

[SaventaenS]

error codding