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Week 13 : Interface and Application Programming



Objectives

  • Interpret and implement design and programming protocols to create a Graphic User Interface (GUI).

    • MIT App Inventor 2

    Switching on and off the LED in the ATtiny44 board , using bluetooth module inteface using Androind Application.

    See the Design for the App

    design

    See the Block fucntions

    blocks

    Download File Download APK File

    Design the board

    I have designed a board with ATtiny44 microcontroller with pins allocated for the motors, bluetooth and the Sensors. Designing was done on the Eagle software and see below the schematic diagram.

    schematic

    See below the Board view.

    board

    to Download the Design Files Click Here

    Milling the board

    finalprojmillcut
    The trace image

    final projoutcut
    The cut image

    to Download the Mill Files Click Here

    The board was ready and it is working , See below image

    beforssolderboard
    The board before soldering

    components
    The list of components used in making the board

    boardmilled
    The finished board

    Arduino Program for MIT app Inventor 2

    I have done the programming for the ATtiny 44 board which i milled for my Final Project. Click Here

    Arduino pin 5 of Attiny44 is connected to LED

    interface

    Download File Download Program File

    Bluetooth module HC-05

    I bought a Bluetooth module HC-05 from online.

    Data sheet of HC-05 Bluetooth Module

    HC-05 Technical Specifications

    • Serial Bluetooth module for Arduino and other microcontrollers
    • Operating Voltage: 4V to 6V (Typically +5V)
    • Operating Current: 30mA
    • Range: <100m
    • Works with Serial communication (USART) and TTL compatible
    • Follows IEEE 802.15.1 standardized protocol
    • Uses Frequency-Hopping Spread spectrum (FHSS)
    • Can operate in Master, Slave or Master/Slave mode
    • Can be easily interfaced with Laptop or Mobile phones with Bluetooth
    • Supported baud rate: 9600,19200,38400,57600,115200,230400,460800.

    Enable / Key - This pin is used to toggle between Data Mode (set low) and AT command mode (set high). By default it is in Data mode

    Vcc - Powers the module. Connect to +5V Supply voltage

    Ground - Ground pin of module

    TX -Transmitter -Transmits Serial Data. Everything received via Bluetooth will be given out by this pin as serial data.

    RX - Receiver - Receive Serial Data. Every serial data given to this pin will be broadcasted via Bluetooth

    State - The state pin is connected to on board LED, it can be used as a feedback to check if Bluetooth is working properly.

    LED - Indicates the status of Module

    Interfacing

    I have done the programming for the ATtiny 44 board which i milled for my Final Project, Click Here for More Details of the Board

    The bluetooth module RX to Tx and TX to RX of the microcontroller board.
    GND and Vcc to GND and Vcc of board
    I connected the the LED was connected to arduino pin 7

    working of my board

    Creative Commons License
    This work by Aby Michael is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.