Button checker

use this project to know more about your button!

the code:

#define buttonPin 2
#define ledPin 13
bool state = 0;
bool lastRead = 0;
void setup() {
 // put your setup code here, to run once:
Serial.begin(9600);
pinMode(2,INPUT);
pinMode(13,OUTPUT);
}
void loop() {
 // put your main code here, to run repeatedly:
state = digitalRead(2);
if(state != lastRead)
{
 Serial.println(state);
digitalWrite(ledPin,state)
 lastRead = state;
}
}

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#define buttonPin 2 

define word "buttonPin" as number 2 so when you write "buttonPin" = when you write 2

#define ledPin 13

define word "ledPin" as number 13 so when you write "ledPin" = when you write 13

bool state = 0; 

the state of the button

bool lastRead = 0; 

The last reading of the button

void setup() {
 // put your setup code here, to run once:
Serial.begin(9600);
pinMode(buttonPin,INPUT); 
}

Serial.begin(9600);

defines Serial monitor

pinMode(buttonPin,INPUT); 

define "buttonPin" mode

void loop() {
 // put your main code here, to run repeatedly:
state = digitalRead(2);
if(state != lastRead)
{
 Serial.println(state);
digitalWrite(ledPin,state)
 lastRead = state;
}
}

state = digitalRead(2);

put the reading of the button into "state"

if(state != lastRead)

if "state" is not "lastReading"

Serial.println(state);

print "state" into Serial monitor

digitalWrite(ledPin,state)

write the state of the button into pin 13

lastRead = state;

make "lastRead" = "state" value