Published July 10, 2020

How To Make DIY Arduino 30 Seconds Washing Timer, STOP COVID

BeginnerFull instructions provided1,615

Things used in this project

Hardware components

Arduino UNO

HC-SR04 Ultrasonic Module

4 Digital Display TM1637

Passive Buzzer

Breadboard (generic)

Story

Warshing-counter connection instructionsThis connection must be correct. If the input is wrong, the TM1637 LED will not light or may display abnormal numbers.Parts List:

Arduino Nano

Ultrasonic Distance Sensor - HC-SR04

Jumper wires

Breadboard

4-Digit LED Display TM1637

Buzzer

Production1.Install Library file: Open "Tools"-"Library Manager" in the Arduino development software, then search for TM1637, and then install TM1637.

Select the development board as Arduino Nano, this is to choose the right.

3.Then select the port, you can upload the code into the development board.

4.Select the processor as ATmega328P(Old Bootloader), this is to choose the right.

5.enjoy it

Code

WashingTimer.ino

#include <TM1637Display.h>
#define trig_pin 11
#define echo_pin 10
#define CLK 6
#define DIO 7
#define buzzer 8
long duration;
float cm;
const uint8_t Clear[] = {0, 0, 0, 0};

TM1637Display display(CLK, DIO);
void setup(){ 
  
  pinMode(trig_pin, OUTPUT); 
  pinMode(echo_pin, INPUT); 
  pinMode(buzzer,OUTPUT); 
  display.setBrightness(4);
  display.setSegments(Clear);


}
void countdown() {
  for(int i=29; i>=0; i--) {
    display.showNumberDec(i, true, 2, 2);
    delay(1000);
  }
}

void loop() {
    digitalWrite(trig_pin, LOW);
    delayMicroseconds(2);
    digitalWrite(trig_pin, HIGH);
    delayMicroseconds(10);
    duration = pulseIn(echo_pin, HIGH);
    cm = duration * 0.034 /2;
  if (cm < 8 && cm >= 1) {
      tone(8,800,40);
      countdown();
      tone(8,800,40);
      display.setSegments(Clear);
  }
}