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const byte numSensors = 3;//const means constant variables, byte means small space in memory, numSensors is the variable name.
const byte ECHO_PIN[numSensors] = {2, 5, 8};
const byte TRIG_PIN[numSensors] = {3, 4, 7};
void setup() {
Serial.begin(115200);
pinMode(LED_BUILTIN, OUTPUT);
for (byte s=0; s< numSensors; s++) { /*due to for loop, we reduce pinMode instructions from 6 to 2
pinMode(2, INPUT);
pinMode(4, OUTPUT);
pinMode(5, IMPUT);
pinMode(7, OUTPUT);
pinMode(8, IMPUT);
pinMode(TRIG_PIN[s], OUTPUT);
pinMode(ECHO_PIN[s], INPUT);
}
}
float readDistanceCM(byte s) {
//This is a function with a parámeter (s) and return a value that depends on the duration of a pulseIn function and the matematical calculus with the velocity of sound*/
digitalWrite(TRIG_PIN[s], LOW); /*We need to have the trigger pin controlled to a low value in order to measure the duration of the high value that is proporcional to the distance of the sensor*/
delayMicroseconds(2);
digitalWrite(TRIG_PIN[s], HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN[s], LOW);
int duration = pulseIn(ECHO_PIN[s], HIGH);
return duration * 0.034 / 2; //divided by 2 because the ultrasound goes returns back
}
void loop() {
bool isNearby = false;
Serial.print("Measured distance: ");
for (byte s=0; s< numSensors; s++) {
float distance = readDistanceCM(s);
isNearby |= distance < 100;
Serial.print(distance);
Serial.print(" ");
}
Serial.println();
digitalWrite(LED_BUILTIN, isNearby);
delay(100);
}
solution with LiquidCrystal Library
Here
#include
#include
#include "LiquidCrystal.h"
LiquidCrystal lcd(A0, A1, A2, A3, A4, A5);
const int trigPin1 = 9;
const int echoPin1 = 10;
const int trigPin2 = 5;
const int echoPin2 = 6;
const int trigPin3 = 7;
const int echoPin3 = 8;
long duration1;
long duration2;
long duration3;
int distanceCm1, distanceInch1;
int distanceCm2, distanceInch2;
int distanceCm3, distanceInch3;
void setup() {
Serial.begin(9600);
lcd.begin(16,2);
pinMode(trigPin1, OUTPUT);
pinMode(echoPin1, INPUT);
pinMode(trigPin2, OUTPUT);
pinMode(echoPin2, INPUT);
pinMode(trigPin3, OUTPUT);
pinMode(echoPin3, INPUT);
pinMode(12,OUTPUT);
pinMode(11,OUTPUT);
pinMode(3,OUTPUT);
}
void loop()
{
digitalWrite(trigPin1, LOW);
delayMicroseconds(2);
digitalWrite(trigPin1, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin1, LOW);
duration1 = pulseIn(echoPin1, HIGH);
digitalWrite(trigPin2, LOW);
delayMicroseconds(2);
digitalWrite(trigPin2, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin2, LOW);
duration2 = pulseIn(echoPin2, HIGH);
digitalWrite(trigPin3, LOW);
delayMicroseconds(2);
digitalWrite(trigPin3, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin3, LOW);
duration3 = pulseIn(echoPin3, HIGH);
distanceCm1= duration1*0.034/2;
distanceInch1 = duration1*0.0133/2;
distanceCm2= duration2*0.034/2;
distanceInch2 = duration2*0.0133/2;
distanceCm3= duration3*0.034/2;
distanceInch3 = duration3*0.0133/2;
Serial.print("Distance1: ");
Serial.println(distanceCm1);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Ultrasonic1 ");
lcd.setCursor(12,0);
lcd.print(distanceCm1);
//delay(500);
Serial.print("Distance2: ");
Serial.println(distanceCm2);
lcd.setCursor(0,1);
lcd.print("U2 ");
lcd.setCursor(3,1);
lcd.print(distanceCm2);
Serial.print("Distance3: ");
Serial.println(distanceCm3);
lcd.setCursor(9,1);
lcd.print("U3 ");
lcd.setCursor(12,1);
lcd.print(distanceCm3);
if(distanceCm1 < 150)
{
digitalWrite(3,HIGH); // LED ON
}
if(distanceCm1 >150)
{
digitalWrite(3,LOW); // LED OFF
}
if(distanceCm2 < 150)
{
digitalWrite(12,HIGH); // LED ON
}
if(distanceCm2 > 150)
{
digitalWrite(12,LOW); // LED OFF
}
if(distanceCm3 < 150)
{
digitalWrite(11,HIGH); // LED ON
}
if(distanceCm3 > 150)
{
digitalWrite(11,LOW); // LED OFF
}
delay(1000);
}