THE ULTRA SONIC SENSOR

 

THIS IS ONE COOL WAY TO TRY OUT SOMETHING WE'VE ALL BEEN DOING SINCE GRADE ONE...

SO THE BIG QUESTION IS "WHAT IS AN ULTRA-SONIC SENSOR...WHAT DOES IT DO?" 

WELL AMONGST OTHER THINGS, IT CAN BE USED TO MEASURE DISTANCE BETWEEN OBJECTS.IT WORKS BY SENDING A SIGNAL FROM ONE OF THE OUTPUTS, THE TRANSMITTER (SEEN HERE ON THE LEFT, MARKED 'T'), THIS SIGNAL, DEPENDING ON ITS STRENGTH, HITS A SOLID OBJECT AND IS REFLECTED BACK, RECEIVED BY THE OTHER OUTPUT (RECEIVER-'R'), AND THE DISTANCE IS CALCULATED

  

 MATERIALS NEEDED

• ARDUINO BOARD AND CABLE
• BREAD BOARD
• 220 OHM RESISTOR FOR THE LED
• ULTRA-SONIC SENSOR
• JUMPER WIRE 
• LED

 THIS IS THE ULTRA SONIC SENSOR (the pins from left to right are VCC, TRIG, ECHO and GND)

 

NOTE: CONNECT YOUR CIRCUIT AS FOLLOWS

• VCC TO ARDUINO 5V
• GND TO ARDUINO GND
• ECHO TO ARDUINO PIN 7
• TRIG TO ARDUINO PIN 8
• LED TO ARDUINO PIN 9

 AND THE CODE (QUITE LENGTHY, OOOPS):

int echopin =7;

int trigpin =8;

int led = 9;

int maxdistance = 200;

int mindistance = 0;

long duration, distance;

void setup(){

  Serial.begin(9600);

  pinMode(trigpin,OUTPUT);

  pinMode(echopin,INPUT);

  pinMode(led,OUTPUT);

}

void loop(){

  digitalWrite(trigpin,LOW);

  delayMicroseconds(2);

  digitalWrite(trigpin,HIGH);

  delayMicroseconds(10);

  digitalWrite(trigpin,LOW);

  duration = pulseIn(echopin,HIGH);

  distance = duration/58.2;

if (distance >= maxdistance||distance <= mindistance){

    Serial.println("OUT OF RANGE");

    digitalWrite(led,HIGH);

  }

  else{

    Serial.println(distance);

    digitalWrite(led,LOW);

  }

  delay(50);

}

 SO WHAT DO YOU THINK?

THINK+CREATE+REPEAT