#include <EEPROM.h>

#define P_led 11
#define P_potentiometer A5

int maxPotentiometerValue = 1023;
void setup()
{
  Serial.begin(9600);
  pinMode(P_led, OUTPUT);

  // EEPROM.write(0, 44);
  // EEPROM.write(1, 11);

  // Serial.println(EEPROM.read(0));
  // Serial.println(EEPROM.read(1));
  maxPotentiometerValue = EEPROM.read(0);
  Serial.println((String)"读取存储的maxPotentiometerValue=" + maxPotentiometerValue);
}


int potentiometerValue = 0;
void listenPotentiometer() {
  int newValue = analogRead(P_potentiometer);
  potentiometerValue =  newValue > maxPotentiometerValue ? maxPotentiometerValue : newValue;
  // Serial.println(potentiometerValue);
}

void listenSerialSend() {
  if (Serial.available() <= 0) {
    return;
  }
  int value = Serial.parseInt();
  if (value <= 0) {
    return;
  }

  maxPotentiometerValue = value;
  EEPROM.write(0, maxPotentiometerValue);
  Serial.println((String) "maxPotentiometerValue=" + maxPotentiometerValue);
}

void lightingLed() {
  float radio = 0.25;
  int ledValue = potentiometerValue * radio;
  analogWrite(P_led, ledValue);

  //Serial.println((String)"led:" + ledValue + ", po:" + potentiometerValue);
}



void loop()
{
  listenPotentiometer();
  listenSerialSend();
  lightingLed();
}