char led;
const byte kl = 10;
const byte sl = 9;
const byte yl = 8;
void setup() {
Serial.begin(9600);
pinMode(kl, OUTPUT);
pinMode(sl, OUTPUT);
pinMode(yl, OUTPUT);
}
void loop() {
if (Serial.available()){
led = Serial.read();
}
if (led == "k"){
digitalWrite(kl,HIGH)...