#include <Arduino.h>
// JTR 2020-09-06: Doesn't work yet...

//#define LED_BUILTIN 1

int sensorPin = 7;    // select the input pin for the potentiometer
int ledPin = 1;      // select the pin for the LED

int minSens = 32767;
int maxSens = 0;

bool isInit=true; // the "millis() function will overflow after 50 days, therefore using a flag..."

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(sensorPin, INPUT);
  //Serial.begin(115200);
  //delay(1000); // give me time to bring up serial monitor
  //Serial.println("ESP32");
}

void loop() {
  // read the value from the sensor:
  int sensorValue = analogRead(sensorPin);
  if (sensorValue > maxSens) { maxSens=sensorValue; }
  if (sensorValue < minSens) { minSens=sensorValue; }
  // stop the program for <sensorValue> milliseconds:

  double diff=(double)(sensorValue-minSens+1)/(double)(maxSens-minSens+1);
  
  if ((isInit) && (millis() < 1000*30)){
    digitalWrite(ledPin, HIGH);
    delay(diff*100);
    digitalWrite(ledPin, LOW);
  } else {
    isInit=false;
  }

  if ((diff > 0.1) && (!isInit)) {
    for (int i=0;i<60*5;i++){ 
      // looks like really long delays are causing the thing to crash, therefore do something in the loop ;)
      digitalWrite(ledPin, LOW);
      digitalWrite(ledPin, HIGH);
      
      delay(1000);
    }
  } else {
    digitalWrite(ledPin, LOW);
  }

  delay(50);
}