View source for Somatosensory interaction - ultrasound

{{Language | 体感互动-超声波}}
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==Objective==
This tutorial will display a distance that ultrasonic sensor measured in Processing with a curve.

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-FT232R]]'''
*Other equipment
**USB cable           one  
**Ultrasonic sensor   one
**The magnet          one
**330Ω resistor       one
**Bread               one
**Breadboard Jumper   onebox

==Schematic==

[[File:interactionUltrasonicSchematics.jpg|600px|center|thumb]]

==Program==

Refers to  interactionUltrasonic
interactionUltrasonicArduino

==Debug==
Step 1: Set up hardware system, as follows:
[[File:interactionUltrasonicConnectionDiagram.jpg|600px|center|thumb]]

Step 2: Explain the code:

This example needs two parts code, one is Processing and the other is Microduino.

Microduino:

//Calculate the distance and output to serial for Processing's display.
  void loop()
  {
    digitalWrite(TrigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(TrigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(TrigPin, LOW);
  
    cm = pulseIn(EchoPin, HIGH) / 58.0; //Echo time will be converted into cm
    cm = (int(cm * 100.0)) / 100.0; //Two decimal places
    Serial.println(cm);
    delay(100);
  }

Processing:

//Get the the first serial data,
// is always my  Arduino, so I open Serial.list()[0].
// Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[0], 9600);
  myPort.bufferUntil('\n'); // Trigger a SerialEvent on new line

//Use the curve to display the data that Microduino sent using the curve and mark the table scale
  void draw() {
    background(255);
    // Draw lines connecting all points
    for (int i = 0; i < vals.length-1; i++) {
      stroke(0);
      strokeWeight(1);
      line(i, vals[i], i+1, vals[i+1]);
    }
    // Slide everything down in the array
    for (int i = 0; i < vals.length-1; i++) {
      vals[i] = vals[i+1];
    }
    // Add a new random value
    //vals[vals.length-1] = random(height);
    String val = myPort.readStringUntil('\n');
    if (val != null) {
      val = trim(val);
      println(val);
      cm=Float.parseFloat(val);
    }
    vals[vals.length-1] = 200-cm;
    //Display scale
    text ( "200-", 370, 10); 
    text ( "--", 370, 50); 
    text ( "100-", 370, 100);
    text ( "--", 370, 150); 
    text ( "0-", 370, 200); 
    //show current num
    text ( cm, 0, 10);
  }

Step 3: Compile the code and download it.

Step 4: Running the program and put an object in front of the ultrasonic sensor, then observe the Processing's output.

==Result==
Screen will display the distance data curve, as follows:
[[File:interactionUltrasonicResult.jpg|600px|center|thumb]]

==Vidoe==


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