INTERACTION LAB RECITATION 10

Special Recitation – Smoothing Sensor Values Workshop

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Smoothing | Arduino

// IMA NYU Shanghai
// Interaction Lab
// For sending multiple values from Arduino to Processing

#include <NewPing.h>

#define PING_PIN  12  // Arduino pin tied to both trigger and echo pins on the ultrasonic sensor.
#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(PING_PIN, PING_PIN, MAX_DISTANCE); // NewPing setup of pin and maximum distance.

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

void setup() {
  Serial.begin(9600);
  // initialize all the readings to 0:
  for (int thisReading = 0; thisReading < numReadings; thisReading++) {
    readings[thisReading] = 0;
  }
}

void loop() {
  // to send values to Processing assign the values you want to send
  //this is an example
//  int sensor1 = analogRead(A0);
//  int sensor2 = analogRead(A1);
//  int sensor3 = analogRead(A2);
//
//  // send the values keeping this format
//  Serial.print(sensor1);
//  Serial.print(",");  // put comma between sensor values
//  Serial.print(sensor2);
//  Serial.print(",");  // put comma between sensor values
//  Serial.print(sensor3);

 // subtract the last reading:
  total = total - readings[readIndex];
  // read from the sensor:
  readings[readIndex] = sonar.ping_cm();
  // add the reading to the total:
  total = total + readings[readIndex];
  // advance to the next position in the array:
  readIndex = readIndex + 1;

  // if we're at the end of the array...
  if (readIndex >= numReadings) {
    // ...wrap around to the beginning:
    readIndex = 0;
  }

  // calculate the average:
  average = total / numReadings;
  
  Serial.print(average);
  Serial.println(); // add linefeed after sending the last sensor value

  // too fast communication might cause some latency in Processing
  // this delay resolves the issue.
  delay(100);

  // end of example sending values
}

 

Adding visual effects through Processing.