#include <Arduino.h>
#include <U8x8lib.h>

U8X8_SSD1306_128X64_NONAME_SW_I2C u8x8(/* clock */ 4, /* data */ 3, /* reset */ U8X8_PIN_NONE);



#define RELAY 1     // LED1, must connect to pwm pin

float averageVolt = 0.0;
const float threshold = 0.36;

void setup() {

  pinMode(RELAY, OUTPUT);
  digitalWrite(RELAY,LOW);
  u8x8.begin();
  u8x8.setPowerSave(0);
  u8x8.setFont(u8x8_font_8x13B_1x2_n);


}


void loop() {
   int atod = analogRead(1);
   float volt = atod * 5.0 / 1024;

   averageVolt = (volt + averageVolt) / 2.0;

   
   String vString = String(averageVolt);
   u8x8.drawString(0, 1,  vString.c_str());

    if (averageVolt - volt > threshold) {
       digitalWrite(RELAY,HIGH);
       delay(2000);
    } else {
      digitalWrite(RELAY,LOW);
    }
   delay(10);
}