ARDUINO BASED REACTION TIMER

Have you ever wanted to test your reaction time or see which one of your friends has the fastest reaction time? In this project, I’ll be showing you how to build an Arduino based reaction timer. The timer lights up a red LED and then measures how long it takes you to respond to the light by pushing a button. The initial time it takes to turn the LED on is randomised to eliminate guessing and the timer disregards the input if you hold the button down before the LED comes on to stop cheating.This project assumes you know the basics of Arduino programming, otherwise read our guide on getting started with Arduino.

1. ARDUINO UNO
2. LED
3. OLED
4. PUSHBUTTON
5. RESISTORS(1K, 330)
6. BREADBOARD

CONNECTING PARTS

OLED

VCC----5V

GND-----GND

SCK-------A5

SDA-------A4

PUSHBUTTON

DIGITAL PIN 2

LED

DIGITAL PIN 3

#include //Include the libraries for the display #include #include #include #define SCREEN_WIDTH 128 //OLED display width, in pixels #define SCREEN_HEIGHT 32 //OLED display height, in pixels Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); //Create the display object int pinButton = 2; //Define the pins for the Button & LED int pinLED = 3; int startTime = 0; //Define variables for the start and end time int endTime = 0; void setup() { pinMode (pinLED, OUTPUT); //Assign the LED & button pins pinMode (pinButton, INPUT); if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) //Start communication with display, address 0x3C for 128x32 { for(;;); //Don't proceed, loop forever if display communication fails } } void loop() { display.clearDisplay(); display.setTextSize(1); //Set the display text size display.setTextColor(SSD1306_WHITE); //Draw white text display.setCursor(25,0); //Start at top-left corner, 25 pixels in display.println(F("Press To Play")); //Display text on screen display.display(); //Update display if (digitalRead(pinButton) == LOW) //If button to start game is pressed { display.setCursor(40,10); //Display "Ready" countdown with 3 sequential dots display.print(F("Ready")); display.display(); delay(1000); display.print(F(".")); display.display(); delay(1000); display.print(F(".")); display.display(); delay(1000); display.print(F(".")); display.display(); int delayTime = random(2000,7000); //Wait a random amount of time between 2s and 7s so that users can't guess the start time delay(delayTime); //Delay the random amount of time digitalWrite(pinLED, HIGH); //Light up the LED startTime = millis(); //Record the start time while (digitalRead(pinButton) == HIGH) //Wait for the user to push the button { } endTime = millis(); //Record the button push time digitalWrite(pinLED, LOW); //Turn off the LED int totalTime = endTime - startTime; //Calculate the total response time display.clearDisplay(); //Display the results if (totalTime <= 20) //Check for cheating by holding the button down { display.setCursor(20,0); display.println(F("Don't Hold The")); display.setCursor(20,10); display.print(F("Button Down")); } else //Display the results { display.setCursor(30,0); display.println(F("Your Time:")); display.setCursor(45,10); display.print(totalTime); display.print(F("ms")); } display.display(); delay(5000); //Wait 5 seconds on results before restarting } delay(100); }