#include <LiquidCrystal_PCF8574.h>

LiquidCrystal_PCF8574 lcd(0x27);

#define Q0 13

long PWM;

void setup() {

ledcAttachPin(Q0, 0);
ledcSetup(0,10000, 8);

lcd.begin(20,4);
delay(200);
lcd.setBacklight(255);
lcd.print("PWM");
}

void loop() {

PWM = analogRead(36) * 255 /4095;

lcd.setCursor(5,0);
lcd.print(PWM);
lcd.print("   ");

ledcWrite(0, PWM);
delay(100);
}