# React!-ion Time Device

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## Introduction: React!-ion Time Device

Have you ever grabbed something thrown to you, five seconds after it passed you?

This Project is for both those who now have a banana in their hand and those who now have a banana on the floor.

This is a simple build with an even simpler code.

It tests your reaction time based on how fast you manage to push the button after a light turns on.

I'm assuming that no user reacts with the speed of light, so we're just going to say bye-bye to that constant for a while. If anyone wants to implement it into their project it's approximately C=3,00*10^8.

So, let's get started.

## Supplies

• Arduino Uno (and the USB cable that follows)
• 1 LED
• 1 Button
• 1 10k ohm resistor
• 1 220 ohm resistor.
• 6 Jumper Wires

## Step 1: Get the Components

Arduino Starter Kit: https://www.banggood.com/Basic-Starter-Kit-UNO-R3-...

This kit is relatively cheap and contains all the parts you need

## Step 2: The Circuit

DISCLAIMER: I'm not experienced writing Circuits, so the picture might be misleading.

## Step 3: The Code

```//Declare the variables
int Led = 7;
int Button = 8;
int val = 0;
int Charge = 0;
float theTime = 0:

//Begin Serial communication with Serial Monitor and define INPUT/OUTPUT
void setup () {
Serial.begin(9600);
pinMode(Led, OUTPUT);
pinMode(Button, INPUT);
}

//The main code
void loop () {
val = random(5, 100);

if(val == 20 && Charge == 0){
digitalWrite(Led, HIGH);
Serial.println("Light has been turned on");
Charge++;
}

if(val == 20 && digitalRead(Button) == 1){
delay(1);
theTime++;
Serial.println(theTime);
}

theTime = theTime/100;
Serial.println("You Spent " + String(theTime) + " Seconds.");
delay(1000000000);
}
}
}
```

## Step 4: The Test

Now, let's test it.

2. Press Ctrl + Shift + M(alternatively open Serial Monitor through Tools)
3. Press the button when the LED lights up.

Congrats! You can now see your reaction time! :)

If you have any problems with this project, please let me now in the comments.

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