[JasQ]

Taka linijka załatwi ci sprawę

Kod:

if ( counter < 1 )counter = 1 ;
if ( counter > 9 )counter = 9 ;

No dobra 2 linijki

A niech ci będzie masz gotowca   przyciski pin 3 i 4 do masy .

Kod:

byte state3 = HIGH ;
byte state4 = HIGH ;

int counter = 1 ;

void setup() {
 
 Serial.begin(9600);
 pinMode(3,INPUT_PULLUP);
 pinMode(4,INPUT_PULLUP);
 
}

void loop() {
 
if ( digitalRead(3) == LOW and state3 == HIGH){
 counter = counter + 1 ;state3 = LOW ;}

if ( digitalRead(4) == LOW and state4 == HIGH){
 counter = counter - 1 ;state4 = LOW ;}

if ( digitalRead(3) == HIGH )state3 = HIGH;
if ( digitalRead(4) == HIGH )state4 = HIGH;

if ( counter > 9 )counter = 9;
if ( counter < 1 )counter = 1;

Serial.println(counter);
 
}