Arduino led pulse gun thingy

#include <LiquidCrystal.h>

// select the pins used on the LCD panel
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

// define some values used by the panel and buttons
int lcd_key     =     0;
int adc_key_in  =     0;
#define btnRIGHT      0
#define btnUP         1
#define btnDOWN       2
#define btnLEFT       3
#define btnSELECT     4
#define btnNONE       5
#define SelctionDelay 250
#define MAX_PWM       10000
#define LedPin        17
#define ButtonDelay   50 //ms

int current_pwm = 0;
int a1read = 0;

// read the buttons
int read_LCD_buttons()
{
  adc_key_in = analogRead(0);      // read the value from the sensor
  // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
  // we add approx 50 to those values and check to see if we are close
  if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
  if (adc_key_in < 50)   return btnRIGHT;
  if (adc_key_in < 250)  return btnUP;
  if (adc_key_in < 450)  return btnDOWN;
  if (adc_key_in < 650)  return btnLEFT;
  if (adc_key_in < 850)  return btnSELECT;
  return btnNONE;  // when all others fail, return this...
}

void setup()
{
  lcd.begin(16, 2);
  pinMode(A3, OUTPUT);
  Up();
}
int ledstat = LOW;
long beforemills = 0;
void loop()
{
  lcd_key = read_LCD_buttons();
  switch (lcd_key)
  {
    case btnDOWN:   Down();   break;
    case btnLEFT:   Left();   break;
    case btnNONE:   None();   break;
    case btnRIGHT:  Right();  break;
    case btnSELECT: Select(); break;
    case btnUP:     Up();     break;
  }
  doStuff();
}
long prevMils = 0;
void doStuff()
{
  long crnt_mills = millis();
  if (crnt_mills - prevMils >= ((1000 / current_pwm) / 2))
  {
    prevMils = crnt_mills;
    if (ledstat == LOW)
    {
      ledstat = HIGH;
    }
    else
    {
       ledstat = LOW;
    }

    digitalWrite(LedPin, ledstat);
  }
}
void Up()
{
  if (current_pwm < MAX_PWM)
  {
    current_pwm += 1;
    delay(ButtonDelay);
    Update();
  }
}
void Down()
{
  if (current_pwm > 1)
  {
    current_pwm = current_pwm - 1;
    delay(ButtonDelay);
    Update();
  }
}
void Left()
{
  if (current_pwm > 10)
  {
    current_pwm = current_pwm - 10;
    delay(ButtonDelay);
    Update();
  }
}
void Right()
{
  if (current_pwm < MAX_PWM)
  {
    current_pwm += 10;
    delay(ButtonDelay);
    Update();
  }
}
void None()
{

}
void Select()
{

}
void Update()
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Delay: " + String((1000 / current_pwm) / 2) + "ms");
  lcd.setCursor(0, 1);
  lcd.print("Freq : " + String(current_pwm) + "hz");
}