const uint8_t LIGHT = 22;
const uint8_t LIGHT_BUTTON = 23;
const uint8_t PRESSED = HIGH;

void setup() {
  pinMode(LIGHT, OUTPUT);
  pinMode(LIGHT_BUTTON, INPUT);
}

void loop() 
{
  if (digitalRead(LIGHT_BUTTON) == PRESSED) {
    digitalWrite(LIGHT, HIGH);
  } else {
    digitalWrite(LIGHT, LOW);
  }
  delay(50);
}