Module 7: Exploring Other Sensors


Module 7: Exploring Other Sensors

Goal of this Module: To explore new sensors and learn how they work
Module 7: Exploring Other Sensors Document Download

Module: Exploring Other Sensors 
SquareWear Kit: 


  • breadboard
  • jumper wires
  • LEDs RYBG
  • 3 volt battery
  • coin holder
  • button
    • Lesson 

    
Goals
  
     
    sensors1
    

     
    
Vibrating Motor Disc

      
    sensors2
    

    

      /*
  Blink
  Turns on an vibrating mini motor disc 
  on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */
 
// Pin 13 has an mini motor disc connected on most Arduino boards.
// give it a name:
int buzzPin = 13;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(buzzPin, OUTPUT);     
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(buzzPin, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(buzzPin, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);               // wait for a second
}
  
    
Distance Sensor

     
    sensors3
    

     
    

      // set up the range finder, HC-SR04
int rangeTriggerPin = 2;
int rangeEchoPin = 3;
long currentDistance; // (cm) 

/** 
 * initialization code, happens once
 **/
void setup() 
{
  // for printing
  Serial.begin( 9600 );
 
  // set up the range finder
  pinMode(rangeTriggerPin, OUTPUT);
  pinMode(rangeEchoPin, INPUT);
}
/**
 * loops after setup
 **/
void loop() 
{ 
  // get current distance
  currentDistance = senseCurrentDistance();
  
  // print it out
  Serial.println( currentDistance );
  
  // wait a little before next iteration
  delay( 500 );
}
/**
 * Use the range finder to determine distance to the 
 * closest object. 
 **/
long senseCurrentDistance() 
{
  // The PING is triggered by a HIGH pulse of 2 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  digitalWrite(rangeTriggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(rangeTriggerPin, HIGH);
  delayMicroseconds(5);
  digitalWrite(rangeTriggerPin, LOW);

  // A different pin is used to read the signal from the PING: a HIGH
// pulse whose duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
  long duration = pulseIn(rangeEchoPin, HIGH);
  
  return microsecondsToCentimeters( duration );
}
/** 
 * Determine the distance based on how long it took to echo back.
 **/
long microsecondsToCentimeters(long microseconds)
{
  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.
  return microseconds / 29 / 2;
}
    
Pressure Sensor

     
    sensors4
    

    

      //Adapted from the article: http://bildr.org/2012/11/force-sensitive-resistor-arduino

int FSR_Pin = A0; //analog pin 0


void setup(){
  // for printing
  Serial.begin(9600);
}

void loop(){
  // capture the readings of the sensor
  int FSRReading = analogRead(FSR_Pin); 
  // print the readings
  Serial.println(FSRReading);
  delay(250); //just here to slow down the output for easier reading
}