Interface an Ultrasonic Sensor

1//Interface a PING ultrasonic sensor which uses ultrasonic waves to measure   distance
2//It consists of 3 pins: GND, 5V, and SIG
3//Datasheet available:   https://www.parallax.com/sites/default/files/downloads/28015-PING-Sensor-Product-Guide-v2.0.pdf
4
5#include   <LiquidCrystal.h>
6
7//variable declarations
8long duration;
9int distancecm;
10long   distancein;
11const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6 = 6, D7 = 7;
12
13LiquidCrystal   lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that are connected to LCD, 4-bit mode
14
15void   setup() {
16  lcd.begin(16,2);          //set 16 columns and 2 rows of 16x2 LCD
17   pinMode(8, OUTPUT);
18  digitalWrite(8, LOW);     
19}
20
21void loop() {
22   //Trigger the sensor with a 2usec HIGH pulse
23  digitalWrite(8, HIGH);
24  delayMicroseconds(2);
25   digitalWrite(8, LOW);
26
27  pinMode(8, INPUT);              //set pin as input   to read return pulse from sensor
28  duration = pulseIn(8, HIGH);    //obtain length   of HIGH pulse in microseconds
29
30  //Ping sensor returns HIGH output pulse that   gives the time required for the burst
31  //echo to return back to the sensor 
32
33   //Speed of sound travels at 1130ft/sec (0.00113ft/usec) or 340m/sec (0.034cm/usec)
34   //Must divide by 2 since time received is time for sound wave to travel to and   from object
35
36  //Calculate distance in inches and centimeters
37  distancecm   = duration*0.034/2;
38  distancein = distancecm*0.3937;     //1cm = 0.3937in
39
40   //display distance to LCD
41  lcd.clear();
42  lcd.print("Distance: ");
43   lcd.print(distancecm);
44  lcd.print("cm");
45  lcd.setCursor(10,1);
46  lcd.print(distancein);
47   lcd.print("in");
48  delay(200);
49  pinMode(8, OUTPUT);               //set   pin 8 back to an output to trigger next distance measurement
50  digitalWrite(8,   LOW);
51
52}

1//Interface a HC-SR04 module which uses ultrasonic waves to measure distance
2//It  consists of 4 pins: VCC, TRIG, ECHO, and GND
3
4#include <LiquidCrystal.h>
5
6//variable  declarations
7long duration;
8int distancecm;
9long distancein;
10const int  RS = 2, EN = 3, D4 = 4, D5 = 5, D6 = 6, D7 = 7;
11
12LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that are connected to LCD, 4-bit mode
13
14void setup() {
15  lcd.begin(16,2);          //set 16 columns and 2 rows of 16x2 LCD
16  pinMode(8,  OUTPUT);       //TRIG pin
17  pinMode(9, INPUT);        //ECHO pin
18  digitalWrite(8,  LOW);     //set TRIG pin low
19}
20
21void loop() {
22  //Trigger the sensor  with a 10usec HIGH pulse
23  digitalWrite(8, HIGH);
24  delayMicroseconds(10);
25  digitalWrite(8, LOW);
26
27  duration = pulseIn(9, HIGH);    //obtain length  of HIGH pulse in microseconds
28
29  //HIGH output pulse is returned that gives  the time required for the burst
30  //echo to return back to the sensor 
31
32  //Speed of sound travels at 1130ft/sec (0.00113ft/usec) or 340m/sec (0.034cm/usec)
33  //Must divide by 2 since time received is time for sound wave to travel to and  from object
34
35  //Calculate distance in inches and centimeters
36  distancecm  = duration*0.034/2;
37  distancein = distancecm*0.3937;     //1cm = 0.3937in
38
39  //display distance to LCD
40  lcd.clear();
41  lcd.print("Distance: ");
42  lcd.print(distancecm);
43  lcd.print("cm");
44  lcd.setCursor(10,1);
45  lcd.print(distancein);
46  lcd.print("in");
47  delay(200);
48
49}

1//Interface a PING ultrasonic sensor which uses ultrasonic waves to measure  distance
2//It consists of 3 pins: GND, 5V, and SIG
3//Datasheet available:  https://www.parallax.com/sites/default/files/downloads/28015-PING-Sensor-Product-Guide-v2.0.pdf
4
5#include  <LiquidCrystal.h>
6
7//variable declarations
8long duration;
9int distancecm;
10long  distancein;
11const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6 = 6, D7 = 7;
12
13LiquidCrystal  lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that are connected to LCD, 4-bit mode
14
15void  setup() {
16  lcd.begin(16,2);          //set 16 columns and 2 rows of 16x2 LCD
17  pinMode(8, OUTPUT);
18  digitalWrite(8, LOW);     
19}
20
21void loop() {
22  //Trigger the sensor with a 2usec HIGH pulse
23  digitalWrite(8, HIGH);
24  delayMicroseconds(2);
25  digitalWrite(8, LOW);
26
27  pinMode(8, INPUT);              //set pin as input  to read return pulse from sensor
28  duration = pulseIn(8, HIGH);    //obtain length  of HIGH pulse in microseconds
29
30  //Ping sensor returns HIGH output pulse that  gives the time required for the burst
31  //echo to return back to the sensor 
32
33  //Speed of sound travels at 1130ft/sec (0.00113ft/usec) or 340m/sec (0.034cm/usec)
34  //Must divide by 2 since time received is time for sound wave to travel to and  from object
35
36  //Calculate distance in inches and centimeters
37  distancecm  = duration*0.034/2;
38  distancein = distancecm*0.3937;     //1cm = 0.3937in
39
40  //display distance to LCD
41  lcd.clear();
42  lcd.print("Distance: ");
43  lcd.print(distancecm);
44  lcd.print("cm");
45  lcd.setCursor(10,1);
46  lcd.print(distancein);
47  lcd.print("in");
48  delay(200);
49  pinMode(8, OUTPUT);               //set  pin 8 back to an output to trigger next distance measurement
50  digitalWrite(8,  LOW);
51
52}