触ると光る-プログラム

#include <LiquidCrystal.h>

const int senserPin = 0;
const int ledPin = 9;

LiquidCrystal lcd(12,11,5,4,3,2);

void setup(){
  pinMode(ledPin,OUTPUT);
  Serial.begin(9600) ;
}

void loop(){
  int brightness = analogRead(senserPin);

   Serial.println(brightness);

  int itensity=map(brightness,0,1023,255,0);


  Serial.println(itensity);
  if(itensity>128){
  analogWrite(ledPin,itensity);
  }else{
    analogWrite(ledPin,0);
  }

  delay(100);

}