setup(){
	int counter ==0;
}
draw(){
	if (counter==0){
		//draw first data
	}else if (counter==1){
		//draw second data
	}
	counter++;//increments counter
	if (counter>=2){//if the counter gets too big, set it back to 0
		counter =0;
	}
	delay(1000)// which is .5 seconds
}