#include "Wire.h"
#include <SPI.h>

#define OLED_SDA 21
#define OLED_SCL 22
#define PIN_4_20MA 36
#define PIN_VEGETRO 0


unsigned int pos;

int value = 0, i, sum, input;
long tim_e;


void scanI2C(){
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");
  nDevices = 0;
  for(address = 0x01; address < 0x7f; address++){
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0){
      Serial.print("I2C device found at address 0x");
      if (address<16) Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");
      nDevices++;
    } else if (error == 4){
      Serial.print("Unknow error at address 0x");
      if (address<16) Serial.print("0");
      Serial.println(address,HEX);
    }
    //delay(1);
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("I2C scan done");
}

void setup()   {                
  Serial.begin(9600);
   Serial.println("Started");
 
#ifdef ESP32  
	adcAttachPin(PIN_VEGETRO);
	// Full scale 11db 3,3V;  linear till 2,6V
	// 6db range full scale 1,8V
	analogReadResolution(12); //ADC conversion resolution 12 bits (9-12)
	analogSetWidth(12);			//ADC read resolution 9-16 bits if not equal, it will be shifted
    analogSetAttenuation(ADC_0db);  //For all pins attenuation: ADC_0db, ADC_2_5db, ADC_6db, ADC_11db
    analogSetPinAttenuation(PIN_VEGETRO, ADC_11db);
#endif

//	scanI2C();
	
}

void loop() {
  
  
	sample_Vegetronix(15);

  
  delay(500);
  
}

int sample_Vegetronix(int readings){
  value = 0;
  int samples[readings-1];
  int maxdev=0;
  sum=0;
  tim_e = micros();
  
   for(i=0; i<readings; i++){
   value = analogRead(PIN_VEGETRO);
   //
   sum += value;
	samples[i] = value;
   Serial.print(value);
	Serial.print(" / "); 
 
   }
   Serial.print(" Sum:");Serial.print(sum);
   value = sum /(i);
   Serial.print(" /Avg:");
   Serial.print(value);
   Serial.print(" /Mdev:");
   for(i=0; i<readings; i++){
	  if(abs(samples[i] - value)>maxdev) maxdev = abs(samples[i] - value);  
   }
   Serial.print(maxdev);
   float percent = (maxdev * 100.0)/value;
   Serial.print(", ");
   Serial.print(percent);
   Serial.println("%");
   

//   Serial.print(" /Conv(usec): ");
//   Serial.println(micros() - tim_e);
}