#include <TM1637Display.h>
//HC-SR04
//Youtube link: https://youtu.be/u9JauTRP_cc
#define echoPin 2
#define trigPin 3
#define resetPin 4
// 4-digital display pins
#define CLK 8
#define DIO 9
TM1637Display display(CLK, DIO);
float duration; //micro second
float cm;
long numDisplay=100;
boolean trigUp = false;
boolean trigDown = false;
float counterPushUp=0;
int buzzer=7;// Passive buzzer pin
void setup() {
pinMode(buzzer,OUTPUT);
Serial.begin(9600);
pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
pinMode(resetPin,INPUT_PULLUP);
display.setBrightness(4);
display.clear();
delay(500);
display.showNumberDecEx(numDisplay, false, true, 4, 0);
}
void loop() {
//reset by switch
if(digitalRead(resetPin)==0){
trigUp=false;
trigDown=false;
counterPushUp=0;
}
digitalWrite(trigPin,LOW);
delayMicroseconds(2);
digitalWrite(trigPin,HIGH);
delayMicroseconds(100);
// receive, convert time (us) to cm
duration = pulseIn(echoPin,HIGH);
cm = duration * 0.034/2.;
if (cm>15 && cm<=30){
trigUp = true;
}
else if (cm < 10){
trigDown = true;
}
else if(cm >30) {
}
if (trigUp==true && trigDown==true){
counterPushUp=counterPushUp+0.5;
trigUp=false;
delay(500);
tone(7,800,40);//buzzer pin 7 frequency 800 duration 500
trigDown=false;
}
display.showNumberDecEx(counterPushUp, false, true, 4, 0);
}