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16.INTERFACE AND APPLICATION PROGRAMMING

May 17, 2016

This week's assignment is to write an application that interfaces with an input &/or output device that you made, comparing as many tool options as possible.
I used input device that I made week11. And this assignment was my first try to develop interface and application, so it was too hard for me...

16-1.Test the force sensor

I tested my input device with the force sensor that I made in week11.

[Tools]
Software: Arduino / Processing

[Arduino Code]
#include <SoftwareSerial.h> int sensorPin = 3; int sensorValue = 0; const int tx = 2; const int rx = 0; SoftwareSerial mySerial(rx,tx); void setup() { pinMode(tx,OUTPUT); pinMode(rx,INPUT); mySerial.begin(9600); } void loop() { if ( mySerial.available() > 0) { sensorValue = analogRead(sensorPin); //mySerial.println(sensorValue); mySerial.write(sensorValue); delay(30); } }
Then I wrote this code to Arduino, and executed command "Burn Bootloader".


The sensor reacted properly!


Next, I developed test application with Processing. I used Koichi Shiraishi's repo as reference because this is first time to use Processing.

[Processing Code]
import processing.serial.*; Serial myPort; int val; float diameter; void setup() { size(450, 600); String portName = Serial.list()[5]; println(portName); myPort = new Serial(this, portName, 9600); } void draw(){ background(0); if ( myPort.available() > 0) { val = myPort.read(); diameter = map(val,0,255,0,550); } fill(val,10); noStroke(); fill(val, 180,0); ellipse(width/2, height*0.4, diameter,diameter); // println(val); } I rewrote Koichi's code. And new code is able to change the color and the size of a circle when I press the sensor.

16-2.Develop the application(1)

I decided to make the application for doing finger snaps. (Because I've been practicing it since I was young, but I can't do finger snaps yet...) The plan of the system is that when the sensor which is attached to a palm is pushed with a finger, the application make a sound that is similar to finger snaps.

So I used " Minim" that is the library for Processing to make a sound.
"Minim is an audio library that uses the JavaSound API, a bit of Tritonus, and Javazoom’s MP3SPI to provide an easy to use audio library for people developing in the Processing environment. "

[Arduino Code]
#include <SoftwareSerial.h> int sensorPin = 3; int sensorValue = 0; const int tx = 2; const int rx = 0; SoftwareSerial mySerial(rx,tx); void setup() { pinMode(tx,OUTPUT); pinMode(rx,INPUT); mySerial.begin(9600); } void loop() { if ( mySerial.available() > 0) { sensorValue = analogRead(sensorPin); //mySerial.println(sensorValue); mySerial.write(sensorValue); delay(30); } }

[Processing Code]
import processing.serial.*; import ddf.minim.*; Minim minim; AudioSample snaps; Serial myPort; int val = 0; float r = random(0,255); void setup() { background(0,0,0); size(150, 150); String portName = Serial.list()[5]; println(portName); myPort = new Serial(this, portName, 9600); minim = new Minim(this); snaps = minim.loadSample("332604__vckhaze__single-finger-snap.mp3"); } void draw(){ if (myPort.available()>0){ val = myPort.read(); println(val); if (val < 15){ background(r,val*15,val/r*15); snaps.trigger(); delay(100); myPort.clear(); } } } void stop() { snaps.close(); minim.stop(); super.stop(); }

I used a code same as "15-1." and downloaded a sound from this website.
Particularly, I thought out the part as below.
---

void draw(){
  if (myPort.available()>0){
    val = myPort.read();
    println(val);
    if (val < 15){ 
      background(r,val*15,val/r*15);
      snaps.trigger();  
      delay(100);
      myPort.clear();
    }
  }

---
If a value that is read by the sensor is smaller than "15", it make a sound. It was not entirely satisfactory that there was only a sound. So, at the same time, the color of window changes.


But, I noticed that this interface didn't make use of the characteristic of the force sensor and I had to use a switch....