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Physical Computing Week 3 - Feedback

Updated: Jan 7

Lab 1

Lab 2 - Had some problems with this one (and LDRs in general), but I think I was using wrong resistors due to my colour blindness.

Lab 3a

Lab 3b

Derpy Theremin w/o data smoothing

Derpy Theremin w/ data smoothing




My idea was to create a sound art installation involving the ultrasonic Theremin proposed in my previous post, that I have since prototyped on a breadboard with a piezo and a quick attempt data smoothing (as I was getting weird spikes).


A motor would control a surface/obstacle that moves around the Theremin's ultrasonic field (apparently hard surfaces work better than soft), thus changing the sound - the obstacle's movement could be controlled by a delayed version of the ultrasonic readings (with a small element of randomness to avoid being potentially stuck in a repetitive loop). Mapping values to musical notes also an option.


Human interaction could be using a potentiometer (or several) to change things such as the wave shape / the speed of the motor, or potentially using IR control from a modified TV remote to effect parameters, such as speed, musical scale etc.


Planning to use wavetable synth library next and connect up to actual speakers to get a wider range of audio.


Code with smoothing:



const int pingPin = 7; // Trigger Pin of Ultrasonic Sensor
const int echoPin = 6; // Echo Pin of Ultrasonic Sensor
int sensorLow = 1023;
int sensorHigh = 0;
int sensorValue = 0;

const int numReadings = 10;

int readings[numReadings];      // the readings from the analog input
int readIndex = 0;              // the index of the current reading
int total = 0;                  // the running total
int average = 0;                // the average
int index = 0;

void setup() 
{
   Serial.begin(9600); // Starting Serial Terminal
  for (int thisReading = 0; thisReading < numReadings; thisReading++) 
  {
    readings[thisReading] = 0;
  }
}

void loop() 
{
   long duration, cm; 
   pinMode(pingPin, OUTPUT);
   digitalWrite(pingPin, LOW);
   delayMicroseconds(2);
   digitalWrite(pingPin, HIGH);
   delayMicroseconds(10);
   digitalWrite(pingPin, LOW);
   pinMode(echoPin, INPUT);
   

   duration = pulseIn(echoPin, HIGH);
   cm = microsecondsToCentimeters(duration);
  // Serial.print(cm);
   //Serial.print("cm");
  // Serial.println();
   delay(1);

   
 total = total + cm;
 index = index + 1;

 if (index >= numReadings)
 {
   index = 0;
   average = total / numReadings;
   Serial.print("Dist_avg = ");
   Serial.print(average);
   Serial.println("mm");
   delay(1);
   total = 0;
 }

int pitch = average * 5; 


  tone(8,pitch,20);
  delay(10);
    
    delay(10);
}

long microsecondsToCentimeters(long microseconds) 
{
   return microseconds / 29 / 2;
}









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