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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 -

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(); }

<p>Thank you for your post, you can find a best way here:<br> <br>attiny85: <br> <br>http://www.componentschip.com/details/Atmel/ATTINY85.html</p>
<p>the first line of code should read as follows:</p><p>#include &lt;SoftwareSerial.h&gt;</p><p>....I didn't get any compile error....</p>
<p>i am trying to make communication beteen attiny-85 and hc05 its not working bro plz help me </p>
<p>Well, something's missing. Where to hook up to Arduino?</p>
<p>The ATTiny85 <strong><em>IS</em></strong> the Arduino.</p>
<p>Any ideas on faster bitrate than 9600 ? </p>
<p>error codding</p>

About This Instructable

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Bio: Hey I'm a College school student, I love to work on projects and Arduino powers most of them. Follow me @ https://www.facebook.com ...
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