AttinyBluetooth

Android app and Arduino code for controlling an LED over Bluetooth

Developed for HackPSU 2015 by Joshua Smith (joshua@psu.edu)

Hardware

Breadboard
Jumper wires
attiny85
Arduino (for programming the attiny)
10 uF Capacitor (for the Arduino programming circuit)
LED
300 - 1k ohm resistor
JY-MCU (HC-06) Bluetooth adapter
USB cable as for power supply

STEP 1: Setting up the software environment

Install Arduino software: http://arduino.cc/en/Main/Software

Install Android Studio: http://developer.android.com/sdk/index.html

Ensure the ADB drivers are installed if using Windows

STEP 2: Setting up the hardware

How to program the attiny85 using an Arduino: http://highlowtech.org/?p=1695

Connect the attiny to the JY-MCU Bluetooth adapter as shown:

STEP 3: Programming the attiny85

In Arduino 1.6.1, create a new sketch and copy the contents of AttinyBluetoothDemo.ino to it

Compile the sketch and send it to the attiny

STEP 4: Programming the Android application

Start a new Android Studio project for Android 4.0.3+, then copy the contents of AttinyBluetooth.java into your main java class, modifying the package name and class name to match yours

Go to https://www.uuidgenerator.net/ to generate a new random UUID for MY_UUID

In AndroidManifest.xml, add this line before the closing manifest tag:

<uses-permission android:name="android.permission.BLUETOOTH" />

In the activity layout xml, add a button with the name "toggleButton"

STEP 5: Connect the circuit and run the application

Connect the circuit to a power source (USB)

Pair your android phone with the JY-MCU (HC-06) Bluetooth adapter

Connect your phone to the computer with Android Studio and enable USB debugging

Run the app by pressing the green arrow in Android Studio and selecting your phone for debugging

Challenge: adding functionality

Expand upon this system. Integrate a fader for the LED using PWM and a slider control, make a Bluetooth morse code transceiver, or implement features of your own design! Feel free to add your own hardware and software components.

This tutorial only shows how to send data to the attiny85. Try using the attiny85 to communicate back to the phone! Hint, use the following arduino code to send characters over Bluetooth:

Bluetooth.println();

The prize for the most creative adaption of this example will be a JY-MCU Bluetooth adapter!

ddematheu/AttinyBluetooth