Easy Arduino

This is page is going to tell you the process of creating an HC-SR04 example. This project doesn't require many materials. It is improved form a work piece. Below is the link of the original work.

https://www.instructables.com/Simple-Arduino-and-H...

Arduino Leornado (The original use Arduino UNO)

One (1) HC-SR04 Ultrasonic Sensor

One (1) yellow LED

One (1) White LED

Two (2) (Brown, Black, Brown. Gold) Resistors

Half Breadboard

Eight (8) Male/Male hookup wires

Connect the components and wires as shown in the two pictures. The Led's color can change as you wish.

Copy the code

At first the code is when the distance of led and the object is smaller than 4 it will light up. I change it to when the distance with the object is from 4 to 50 it will light. Else, another led will light up.

#define trigPin 13

#define echoPin 12

#define led 11

#define led2 10

void setup() {

Serial.begin (9600); pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(led, OUTPUT);

pinMode(led2, OUTPUT); }

void loop() {

long duration, distance; digitalWrite(trigPin, LOW); //Added this line

delayMicroseconds(2); // Added this line

digitalWrite(trigPin, HIGH); //

delayMicroseconds(1000); - Removed this line

delayMicroseconds(10); // Added this line

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = (duration/2) / 29.1;

if (distance > 4 && distance <50) { // 改過 This is where the LED On/Off happens

digitalWrite(led,HIGH); // When the Yellow condition is met, the White LED should turn off

digitalWrite(led2,LOW); }

else { digitalWrite(led,LOW);

digitalWrite(led2,HIGH); }

if (distance >= 200 || distance <= 0){

Serial.println("Out of range");

}

else { Serial.print(distance);

Serial.println(" cm");

}

delay(500); }

Put your hand in front of the sensor and get further slowly. The white light should sine at the beginning. Then yellow light will shine for few seconds. Last, the white light will shine and yellow light will not bright

I use card board to cover my Arduino. On the top there are two holes on it for the led to pass through. One of the side had a hole to let the sensor pass through, For the another side, it is just cardboard.