Question

Conduct an experiment with Arduino using a Button sensor and a LED (connect sensors to Arduino appropriately). Initially, the LED must blink with a delay of 1000 milliseconds (ms), which means it goes on for 1000 ms then off for 1000 ms. When the user presses the button, the delay is decreased by 100 ms. However, if the delay becomes equal to or less than 0 then you have to set the delay back to 1000 ms.

Answer 1

int buttonpushPin=2;   //number where button is connected
int ledPin=13;    //number where the led is connected
int pushState=0;   //default button state

void setup()
{
   pinMode(ledPin, OUTPUT);       //Ledpin initialized to output mode
   pinMode(buttonpushPin, INPUT);   //Buttonpin initialized to input mode
}

void loop()
{
   int x=1000;
   while(x!=-1)
   {
       digitalWrite(13, HIGH);       //Led On
       delay(x);               //delay
       digitalWrite(13, LOW);       //Led off
       delay(x);               //delay
       pushState=digitalRead(buttonpushPin);   //Read button state
       if(pushState = HIGH)
           x=x-100;
       if(x<=0)
           x=1000;
   }
}