Update docs/Assignments/week13.md, docs/files/week13/ellipse-00.pde,...

Update docs/Assignments/week13.md, docs/files/week13/ellipse-00.pde, docs/files/week13/matrix00-OK.ino

docs/Assignments/week13.md

@@ -29,6 +29,8 @@ Here is what I had when connecting the matrix to Arduino (Serial Plotter) and us
 
 Then, I connected it using Processing software. When using processing I struggled to find the right serial port. It was telling me the port was busy with a JBL GO or a Iphone despite the fact that I hadn't any of those with me... I checked on the port number of the USB modem on Arduino and it was the 7th ! so I just add this number on the line : String portName = Serial.list()[**7**]; aaand it worked ! Happy me :)
 
+**Note** You can have a look at how many ports your computer have register in arduino > Tools > Port. The first port of the list is the number 0.
+
 <iframe src="https://giphy.com/embed/wHQrgIW1RpblpiLd8k" width="480" height="232" frameBorder="0" class="giphy-embed" allowFullScreen></iframe><p><a href="https://giphy.com/gifs/wHQrgIW1RpblpiLd8k">via GIPHY</a></p>
 
 ### **Exploring the code on Processing**
@@ -76,3 +78,4 @@ Materials : edible gold leaf, velostat and cling film for isolation
 | **Softwares** | Arduino, Processing |
 | **Tools** | Arduino Uno, Matrix |
 | **Materials** | Conductive fabric/thread and piezoresistive fabric such as Velostat, ATtiny, capacitor, Resistor 220ohms, FTDI chip, LED... |
+| **Files** | [Arduino code](../files/week13/matrix00-OK.ino), [Processing code](../files/week13/ellipse-00.pde) |

docs/files/week13/ellipse-00.pde

+import processing.serial.*;
+
+/*
+Code based on Tom Igoe’s Serial Graphing Sketch
+>> http://wiki.processing.org/w/Tom_Igoe_Interview
+Reads X analog inputs and visualizes them by drawing a grid
+using grayscale shading of each square to represent sensor value.
+>> http://howtogetwhatyouwant.at/
+Working with a matrix
+*/
+
+
+String myString = null;
+String inString = null;
+int lf = 10;    // Linefeed in ASCII
+
+Serial myPort; // The serial port
+int rows = 2;
+int cols = 2;
+int maxNumberOfSensors = rows*cols;
+float[] sensorValue = new float[maxNumberOfSensors]; // global variable for storing mapped sensor values,
+float[] previousValue = new float[maxNumberOfSensors]; // array of previous values
+int ellipseSize = 0;
+int ellipseX;
+void setup () {
+size(600, 600); // set up the window to whatever size you want
+ellipseSize = width/rows;
+
+//println(Serial.list()); // List all the available serial ports
+String portName = Serial.list()[8]; // set the number of your serial port!
+myPort = new Serial(this, portName, 9600);
+myPort.clear();
+myPort.bufferUntil('\n'); // don’t generate a serialEvent() until you get a newline (\n) byte
+background(0,0,255); // set inital background
+smooth(); // turn on antialiasing
+ellipseMode(CENTER); //define the position of the ellipse from its center
+//ellipseMode(CORNER); //define the position of the ellipse from its corner
+}
+
+void draw () {
+for (int i = 0; i < maxNumberOfSensors; i++) {
+fill(sensorValue[i]-28,sensorValue[i]-28, sensorValue[i]-28); //Define first colour of the ellipse
+ellipse(ellipseX + ellipseSize/2, ellipseSize * (i%rows) + ellipseSize/2, ellipseSize*(1-sensorValue[i]/255), ellipseSize*(1-sensorValue[i]/255)); //top left
+if((i+1) % rows == 0) ellipseX += ellipseSize;
+}
+ellipseX=0;
+}
+
+void serialEvent (Serial myPort) {
+inString = myPort.readStringUntil(lf); // get the ASCII string
+println("test");
+if (inString != null) { // if it’s not empty
+inString = trim(inString); // trim off any whitespace
+int incomingValues[] = int(split(inString, "\t")); // convert to an array of ints
+
+if (incomingValues.length <= maxNumberOfSensors && incomingValues.length > 0) {
+for (int i = 0; i < incomingValues.length; i++) {
+// map the incoming values (0 to 1023) to an appropriate gray-scale range (0-255):
+sensorValue[i] = map(incomingValues[i], 0, 1023, 0, 255); // stretch 5×5, because sensor value = 255 at rest (without pressure)
+//incomingValue decreases with pressure because it is the resistance
+sensorValue[i] = constrain(incomingValues[i], 0, 255); // stretch 5×5
+println(sensorValue[i]); // print value to see
+
+}
+}
+}
+}

docs/files/week13/matrix00-OK.ino

+ /*
+Matrix: Kapton + Copper
+A simple pressure sensor matrix made from two Kapton film sheets with
+7×7 copper tape traces and a piece of Velostat or Eeonyx piezoresistive
+material in between.
+parsing through this grid by switching individual rows/columns to be
+HIGH, LOW or INPUT (high impedance) to detect location and pressure.
+>> http://howtogetwhatyouwant.at/
+*/
+
+#define numRows 2
+#define numCols 2
+#define sensorPoints numRows*numCols
+
+int rows[] = {A0, A1};
+int cols[] = {6,5};
+int incomingValues[sensorPoints] = {};
+
+void setup() {
+// set all rows and columns to INPUT (high impedance):
+for (int i = 0; i < numRows; i++) { 
+  pinMode(rows[i], INPUT_PULLUP); 
+  } 
+for (int i = 0; i < numCols; i++) { *
+  pinMode(cols[i], INPUT); 
+  } 
+  Serial.begin(9600); 
+  } 
+  
+void loop() { 
+  for (int colCount = 0; colCount < numCols; colCount++) { 
+    pinMode(cols[colCount], OUTPUT); // set as OUTPUT 
+    digitalWrite(cols[colCount], LOW); // set LOW 
+    for (int rowCount = 0; rowCount < numRows; rowCount++) { 
+      incomingValues[colCount * numRows + rowCount] = analogRead(rows[rowCount]); // read INPUT 
+      }// end rowCount 
+      pinMode(cols[colCount], INPUT); // set back to INPUT! 
+    }// end colCount 
+    
+    // Print the incoming values of the grid: 
+    for (int i = 0; i < sensorPoints; i++) { 
+      Serial.print(incomingValues[i]); 
+      if (i < sensorPoints - 1) 
+      Serial.print("\t"); 
+      } 
+      Serial.println(); 
+      delay(10); 
+      }