Arduino, Makers

Non-Contact Hand Washing Timer Using Maker UNO

by suadanwar
March 27, 2020

Introduction

We should wash our hands? with soap for at least 20 seconds. With this Non-Contact Hand Washing Timer, you can wash your hands with colorful LEDs without counting the numbers. Just clap ?? your hand and the count down⏱ will start.

Video

Watch this video for more info on how to make a non-contact hand washing timer using Maker UNO.

This is the hardware connection and the components needed.

Maker Uno

SK6812 NeoPixel Addressable LED Ring-12 LED

Mini Microphone Module

Right Angle Pin Header (Male) 1×40 Ways

Male to Female Jumper Wire

Sample Code

#include <Adafruit_NeoPixel.h>

#ifdef __AVR__

#include <avr/power.h>

#endif

#define LED_RING    5

#define SENSOR      6

#define PIEZO       8

#define NUMPIXELS   12 // NeoPixel ring size

Adafruit_NeoPixel pixels(NUMPIXELS, LED_RING, NEO_GRB + NEO_KHZ800);

#define NOTE_B5  988

int startNoteDurations[] = {8,4,4};

int stopMelody[] = {NOTE_B5};

int stopNoteDurations[] = {8};

#define playstopMelody() playMelody(stopMelody, stopNoteDurations, 2)

char inChar;

String inString;

void setup() {

#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)

  clock_prescale_set(clock_div_1);

#endif

  pinMode(SENSOR, INPUT);

  pinMode(PIEZO, OUTPUT);

  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)

  Serial.begin(9600);

}

void loop() {

  pixels.clear(); // Set all pixel colors to 'off'

  pixels.show();   // Send the updated pixel colors to the hardware.

  if (digitalRead(SENSOR) == HIGH) {

    for (int i = NUMPIXELS; i >= 0; i–) {

      pixels.setPixelColor(i, pixels.Color(100, 5, 5));

      pixels.show();

      delay(250); // Pause before next pass through loop

    }

    for (int i = 0; i < NUMPIXELS; i++) {

      Serial.print("i = ");

      Serial.println(i);

      pixels.setPixelColor(i, pixels.Color(10, 100, 10));

      pixels.show();

      delay(1700);

    }

    blinking(3);

  }

  else {

    pixels.clear();

    pixels.show();

  }

}

void blinking(int times)

{

  for (int i = 0; i < times; i++) {

    pixels.clear();

    pixels.show();

    delay(200);

    for (int i = 0; i < 12; i++) {

      pixels.setPixelColor(i, pixels.Color(5, 100, 5));

      pixels.show();

    }

    delay(200);

    playstopMelody();

  }

}

void playMelody(int *melody, int *noteDurations, int notesLength)

{

  for (int thisNote = 0; thisNote < notesLength; thisNote++) {

    int noteDuration = 1000 / noteDurations[thisNote];

    tone(PIEZO, melody[thisNote], noteDuration);

    int pauseBetweenNotes = noteDuration * 1.30;

    delay(pauseBetweenNotes);

    noTone(PIEZO);

  }

}

view raw
LED_timer.ino
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Reference

Adafruit No-Touch Hand Washing Timer.

Thank you

Thank you for reading this tutorial and we hope it helps your project development. If you have any technical inquiries, please post at Cytron Technical Forum.