Published April 21, 2019 © GPL3+

Arduino "Reaction Timer" - My Kids Love Playing This

Wait for light - press a button. So simple but so funny. All our family plays the game.

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Arduino "Reaction Timer" - My Kids Love Playing This

Things used in this project

Hardware components

LED (generic)

SparkFun Pushbutton switch 12mm

DFRobot I2C 16x2 Arduino LCD Display Module

Slide Switch

Resistor 10k ohm

Battery Holder, 3 x AAA

Arduino Micro

Hand tools and fabrication machines

Soldering iron (generic)

Story

I discovered the code somewhere on the Internet and tried it.

All my family loved the game and I decided to assemble it in a funny case to be able to play.

The work is now finished and it is into the hands of my kids.

It is a very basic project but in a kind of case which hides all elements.

Here are some pictures:

This is how it looks. The BIG button is a hit button and the small red one on top is "start"

I was able to shrink the system and program only an Atmega328P chip. Runs on 3 AAA.

Press Start

Round 1 of 5

Round 2 of 5

Average result calculation and showing. The "verdict"

Please do not hesitate to ask me questions if needed.

Code

Here's the code

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#define btnSTART 5
#define btnHIT 7
#define ledTrigger 9
LiquidCrystal_I2C lcd(0x23,20,4);

void setup() {
  lcd.init(); 
  lcd.backlight();
  pinMode(btnSTART, INPUT_PULLUP);
  pinMode(btnHIT, INPUT_PULLUP);
  pinMode(ledTrigger, OUTPUT);
  digitalWrite(ledTrigger, LOW);
  lcd.print("Salut Famille!");
  delay(2000);
  lcd.clear();
  randomSeed(analogRead(0));
}

void loop() {
  long timeReaction;
  long timeTotal = 0;
  lcd.print("Press START!");
  while (digitalRead(btnSTART)) {}
  delay(10);
  while (!digitalRead(btnSTART)) {}
  lcd.clear();
  lcd.print("Jouez!!!");
  delay(1000);
  for (int i = 0; i < 5; i++) {
    delay(random(500, 5000));
    timeReaction = millis();
    digitalWrite(ledTrigger, HIGH);
    while (digitalRead(btnHIT)) {}
    timeReaction = millis() - timeReaction;
    timeTotal += timeReaction;
    delay(10);
    while (!digitalRead(btnHIT)) {}
    digitalWrite(ledTrigger, LOW);
    lcd.clear();
    lcd.print(i + 1);
    lcd.print(": ");
    lcd.print(timeReaction);
    delay(1000);
  }
  lcd.clear();
  lcd.print("Moyenne = ");
  lcd.print(timeTotal/5);
  delay(10000);
  lcd.clear();
  }