Day 9 - Intro to Infrared Detectors and Ultrasonic Sensors

• For this lab we used the arduino, along with IR Detector and Ultrasonic Sensors to view heat and distance values using the Arduino. 
• Here is the code for the IR sensor portion of the lab.

#define sensorPin A0 // select the input pin (pin2)
int sensorValue = 0; // variable to store the value coming from the sensor

void setup() {
  Serial.begin(9600);//9600
}
void loop() {
  sensorValue = analogRead(sensorPin); // read the value fromt he sensor:
  Serial.println(sensorValue);
  delay(300);
 // while (Serial.available()){
   // int inChar = Serial.read();
   // Serial.print(inChar);
   // delay(300);
  //}
}

• Picture of IR Sensor in action

• Code for Sonar Sensor.

const int trigPin = 2;
const int echoPin = 4;

void setup() {
  // initialize serial communication:
  Serial.begin(9600);
}

void loop()
{
  // establish variables for duration of the ping,
  // and the distance result in inches and centimeters:
  long duration, inches, cm;

  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  pinMode(trigPin, OUTPUT);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the signal from the sensor: 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.
  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);

  // convert the time into a distance
  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);

  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();

  delay(100);
}

long microsecondsToInches(long microseconds)
{
  // According to Parallax's datasheet for the PING))), there are
  // 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
  // second).  This gives the distance travelled by the ping, outbound
  // and return, so we divide by 2 to get the distance of the obstacle.
  // See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
  return microseconds / 74 / 2;
}

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;
}

• Video for Sonar Sensor