Interface and Application Programming

Assignment:

Write an application that interfaces with an input or output device that I made using bluetooth while comprising with many tool options.

Plan:

My idea for this week is to link my phone with a Led and use my phone to be like a LED switch  on/off.

Eagle:

First I have to prepare an LED Board for the blue tooth linkng. As in the previous weeks I used Eagle software for  optimal connection using auto router. As such I gonna use similar  LED Board to week 15 .

Components:

1- Attitiny 45

2- 3 10 k resistors

3- 330 ohm resisotr

4- LED

5- 10 UF capacitor

6- 2x2 pin

7- ISP (3X3 pin)

The Schematic

and

The Board

Programming my board:

#include <SoftwareSerial.h>

SoftwareSerial mySerial(0, 255); // RX, TX

#define LED 4

char c;

void setup() {

  // Open serial communications and wait for port to open:

  mySerial.begin(9600);

  pinMode(LED, OUTPUT);

  digitalWrite(LED, HIGH);

  delay(1000);

  digitalWrite(LED, LOW);

}

void loop() { // run over and over

  while (mySerial.available() <= 0);

  c = mySerial.read();

  if (c == '1') {

    digitalWrite(LED, HIGH);

    delay(500);

  }

  else

    digitalWrite(LED, LOW);

}

MIT App Inventor:

For the first time I gonna use  MIT app inventor.  The APP require to have a user interafce, on/off switch , and blue  tooth client connectivity.

Setting my LED on/off switch button and try link it with a phone.

Block part:

I have to create a sequence command  in MIT app when  linking my phone with my LED board with the following:

1) when pressing 1 the LED will work

2) when pressing 0 the LED will switch off

Final Result: