Setup
All you need for this project is the Getting Started Kit
Write Code (Java)
Copy the code below into a new Java project. If you need a reminder of how to do this, revisit the Getting Started Course.
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import com.phidget22.*;
public class ReactionTimer {
//Define variables
static int countdown = 3;
static long startTime = 0;
public static void main(String[] args) throws Exception{
//Create
DigitalInput redButton = new DigitalInput();
//Address
redButton.setIsHubPortDevice(true);
redButton.setHubPort(0);
//Event
redButton.addStateChangeListener(new DigitalInputStateChangeListener() {
public void onStateChange(DigitalInputStateChangeEvent e) {
if(e.getState()){
double timeDiff = (System.currentTimeMillis() - startTime)/1000.0;
System.out.println("\nGAME OVER\nTIME: " + timeDiff + " s");
}
}
});
//Open
redButton.open(5000);
//Keep program running
while (true) {
if(countdown > 0){
System.out.println("Countdown: " + countdown);
}
if(countdown == 0){
System.out.println("GO");
startTime = System.currentTimeMillis();
}
countdown -=1 ;
Thread.sleep(1000);
}
}
}
package reactiontimer;
import com.phidget22.*;
public class ReactionTimer {
//Define variables
static int countdown = 3;
static long startTime = 0;
public static void main(String[] args) throws Exception{
//Create
DigitalInput redButton = new DigitalInput();
//Address
redButton.setIsHubPortDevice(true);
redButton.setHubPort(0);
//Event
redButton.addStateChangeListener(new DigitalInputStateChangeListener() {
public void onStateChange(DigitalInputStateChangeEvent e) {
if(e.getState()){
double timeDiff = (System.currentTimeMillis() - startTime)/1000.0;
System.out.println("\nGAME OVER\nTIME: " + timeDiff + " s");
}
}
});
//Open
redButton.open(5000);
//Keep program running
while (true) {
if(countdown > 0){
System.out.println("Countdown: " + countdown);
}
if(countdown == 0){
System.out.println("GO");
startTime = System.currentTimeMillis();
}
countdown -=1 ;
Thread.sleep(1000);
}
}
}
Write Code (Python)
Copy the code below into a new Python project. If you need a reminder of how to do this, revisit the Getting Started Course.
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#Add Phidgets Library
from Phidget22.Phidget import *
from Phidget22.Devices.DigitalInput import *
import time
import datetime
global startTime
countdown = 3
#Event
def onRedButton_StateChange(self, state):
if(state):
timeDiff = time.time() - startTime
print("\nGAME OVER\nTIME: " + str(timeDiff))
#Create
redButton = DigitalInput()
#Address
redButton.setIsHubPortDevice(True)
redButton.setHubPort(0)
#Subscribe to Events
redButton.setOnStateChangeHandler(onRedButton_StateChange)
#Open
redButton.openWaitForAttachment(5000)
ready = False
#Keep program running
while(True):
if(countdown > 0):
print("Countdown: " + str(countdown))
if(countdown == 0):
print("GO")
startTime = time.time()
countdown -= 1
time.sleep(1)
Write Code (C#)
Copy the code below into a new C# project. If you need a reminder of how to do this, revisit the Getting Started Course.
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using System;
using Phidget22;
using System.Diagnostics;
namespace ReactionTimer
{
class Program
{
//Define
static Stopwatch stopwatch;
//Event
private static void RedButton_StateChange(object sender, Phidget22.Events.DigitalInputStateChangeEventArgs e)
{
if (e.State)
{
Console.WriteLine("\nGAME OVER\nTIME: " + stopwatch.ElapsedMilliseconds / 1000.0 + " s");
}
}
static void Main(string[] args)
{
//Create stopwatch
stopwatch = new Stopwatch();
//Create
DigitalInput redButton = new DigitalInput();
//Address
redButton.IsHubPortDevice = true;
redButton.HubPort = 0;
//Subscribe to Events
redButton.StateChange += RedButton_StateChange;
//Open
redButton.Open(5000);
int countdown = 3;
// Keep Program Running
while (true)
{
if(countdown > 0)
{
Console.WriteLine("Countdown " + countdown);
}
if(countdown == 0)
{
Console.WriteLine("GO");
stopwatch.Start();
}
countdown -= 1;
System.Threading.Thread.Sleep(1000);
}
}
}
}
Write Code (Swift)
Copy the code below into a new Swift project. If you need a reminder of how to do this, revisit the Getting Started Course.
Not your programming language? Set your preferences so we can display relevant code examples
Coming Soon!
Run your program. You will see a countdown from 3. When the program says GO, press the red button as fast as you can!
Button Events
If you haven’t already, make sure to check out the Advanced Lesson on Button Events to understand the code.
Practice
- Modify your program so that the user is disqualified (game is over) if they press the button before the countdown is over
- Store the three quickest times as high scores. Display high scores at the end of every game.
