#define SENSOR_POWER 3
#define SENSOR_SIGNAL 34
#define TOUCH_PIN 4
#define LED 2
#define waterthreshold 100
#define touchthreshold 100 
#define N 1000 // max number of readings possible

typedef struct readings_table{
  int time;
  int reading;
} readings_table;

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(SENSOR_POWER,OUTPUT);
  digitalWrite(SENSOR_POWER,LOW);
  pinMode(LED,LOW);
  digitalWrite(LED,LOW);
}

int n=0;
readings_table table[N];

void loop() {
  digitalWrite(SENSOR_POWER,HIGH);
  int a=analogRead(SENSOR_SIGNAL);
  digitalWrite(SENSOR_POWER,LOW);
  table[n].time=millis(); // time since start of communication
  table[n].reading=a;
  n++;
  if(a < waterthreshold){
    digitalWrite(LED, HIGH);
  } else{
    digitalWrite(LED, LOW);
  }
  if(touchRead(SENSOR_SIGNAL)< touchthreshold){
    for(int i=0;i<n;i++){
      Serial.print("Time: ");
      Serial.print(table[i].time);
      Serial.print("  Reading: ");
      Serial.println(table[i].reading);
    }
    n=0;
  }
  delay(10000); // 10 seconds delay
}