step response video

docs/assignments/week11.md

@@ -111,8 +111,83 @@ Note that the wires are only a kind of switch: if we put it in water it will be
 Listen to [Neil lecture video](https://vimeopro.com/academany/fab-2019/video/326957751) at 55:36, he introduce the step response mechanism and I was curious about it. So I manage to make the board and the cardboard and start to test it with the following arduino and processing programs:
 
 (arduino)
+```
+/*
+  read analog voltage at pin A3 in two different times (ruled by ADC pin settling time);
+*/
+#include <SoftwareSerial.h>
+int sense, sense_0;//variables to be measure at two different moments
+int settlingTime = 3; //3 ms to wait for the signal to settle: 25  ADC clock cycles, ATtiny44 datasheet p.129 and 159
+
+
+SoftwareSerial Serial(1, 2); // RX, TX serial communication
+
+void setup() {
+  // initialize serial communication at 9600 bits per second:
+  Serial.begin(9600);
+  pinMode(A3, OUTPUT);
+}
+
+// the loop routine runs over and over again forever:
+void loop() {
+  digitalWrite(A3, LOW);
+  delay(settlingTime);
+  //Serial.println("LOW");
+  sense_0 = analogRead(7);//measure initial voltage
+  digitalWrite(A3, HIGH);
+  delay(settlingTime);
+  sense = analogRead(7);//Measure final voltage
+  float delta = settlingTime/1000.0;
+  float sloap = (sense - sense_0)/delta;//calculate sloap (rate)
+  //Serial.write(sloap);
+  Serial.println(sloap);
+  //Serial.println();
+
+```
 
 (processing)
+```
+// Adapted from the Tom Igoe example at https://processing.org/reference/libraries/serial/Serial_readStringUntil_.html
+
+import processing.serial.*;
+
+int lf = 10;    // Linefeed in ASCII
+String myString = null;
+Serial myPort;  // The serial port
+
+void setup() {
+  size(400, 600);//window size
+  fill(255);// windo color
+  // List all the available serial ports
+  printArray(Serial.list());
+  // Open the port you are using at the rate you want:
+  myPort = new Serial(this, Serial.list()[13], 1200);//choose the number of your serial in the list
+  myPort.clear();
+  }
+
+void draw() {
+  while (myPort.available() > 0) {
+    background(0);
+    text("distance", 50, 80);
+    myString = myPort.readStringUntil(lf);//reading the serial data
+    if (myString != null) {
+      //println(myString);
+      float average = float(myString);
+      //println("average");
+      println(average);
+      square(average);//calling the square function
+    }
+  }
+  myPort.clear();
+}
+
+
+void square(float average){//moving bar
+  noStroke();
+  fill(255);
+  rect(50, 100, average/1000, 50);
+  }
+```
 
 !!! note
     **pullup** resistor explained by Neil at 10:00 of this [lecture](https://vimeopro.com/academany/fab-2019/video/326957751)
@@ -133,7 +208,8 @@ Listen to [Neil lecture video](https://vimeopro.com/academany/fab-2019/video/326
 Conclusion:
 With this arrangement touching is well detected. Distance not so good, but I think if we do an average, it could be better. Weight seem to work weel if I touch the GND as well as you can see at the video.
 
-(put video here)
+<iframe src="https://player.vimeo.com/video/349280387" width="640" height="480" frameborder="0" allow="autoplay; fullscreen" allowfullscreen></iframe>
+<p><a href="https://vimeo.com/349280387">stepResponseOneTouch</a> from <a href="https://vimeo.com/user17547355">Ant&oacute;nio</a> on <a href="https://vimeo.com">Vimeo</a>.</p>
 
 **Next step**: average the measures to get more accuracy.
 
@@ -188,7 +264,7 @@ Cutout parameters:
 I'm using MAC and I have been struggling with the toolchain since week 5. This week, with the Luis Carvão precious help, I manage to overcame the problem. The procedure was to show the problem, presenting what I have allready done and seek for newer debuging steps.
 
 Problem:
-- The main issue is that sommetime it work, other don't, in MAC or LINUX: I was debugig it using Linux, beacuse with this, and the help of Filipe I manage to get sucess, but not entirelly;
+- The main issue is that sommetime it work, other don't, in MAC or LINUX: I was debugig it using Linux, because with this, and the help of Filipe I manage to get sucess, but not entirelly;
 - It was not possible to upload the program using the ARDUINO IDE (on Mac as on Linux);
 - When we managed to sucessed the Serial Terminal of the Arduino IDE didn't show the characteres properly;
 - Since we were interchanged the circuit with MAC and LINUX computer we done the reset of the  ATtiny and it seems to be working better;