Push ON switch to turn "ON" and "OFF" LED.

[mdfarizal]

Very simple question, but i have difficulty to sort it out.

with one push ON button how i can program it (in C language) to turn ON and OFF a LED in single push.

First time Push -> LED = ON,
Second time Push -> LED = OFF,
Third time Push -> LED = ON,
4th time Push -> LED = OFF,
repeated....

Thanks....

[Brian Griffin]

There is a thing in the C language called "toggle". <- The hint is already there.

[robosang]

You say you have difficulty to sort it out, so what is the difficulty? Any code to show us and what is the response?

Yup, brian is pointing you to correct direction, but I just want add some extra idea , you might need debouncing algorithm to wait for switch to release. Again, I will not give answer, just guidance. Try to find and try it, that's learning.

[ZaM]

if(RB0==0)
{
led1 != led1;
}

[ZaM]

if(sw1==0)
{
while(sw1==0); //wait button release
led1 != led1;
}

[robosang]

if(sw1==0)
{
while(sw1==0); //wait button release
led1 != led1;
}

So what is the outcome of this code? How is the LED response if this code is being written into PIC?

[ZaM]

sorry, tq robosang


int constant=1;
while(1) //condition for looping 1-true, 0-false
{

led = constant;

if(sw1==0)
{
while(sw1==0);
constant = !constant;

}
}