Arduino RF Field Strength Meter

/*   Arduino RF Field Strength Meter
 *
 *    learnelectronics
 *    6 Feb 2018
 *
 *    www.youtube.com/c/learnelectronics
 *    email: [email protected]
 *
 *    Input from detector ->A0
 *    Neopixel data: D3
 *
 */
#include <Adafruit_NeoPixel.h>                          //inclde the library to drive the neopixel ring

#define rfIn            A0                              //detect the rf energy on analog pin 0
#define PIN              3                              //neopixels are on digital 3
#define NUMPIXELS       24                              //number of pixels in ring

int level = 0;                                          //variables for calculating the rf energy
int rfStrength = 0;
int avelevel = 0;
int ave = 0;


Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);   //create instance of the neopixel ring



void setup() {

  pixels.begin();                                       //begin the neopixel ring

}


void loop() {

  for (int n = 0; n<20; n++){                           //take 20 readings
    level = analogRead(rfIn);                           //read instant energy on rfIn
    int rfStrength = map(level, 0, 35, 0, 24);          //map it to number of pixels
    ave = ave + rfStrength;                             //keep running total

  }
  avelevel = ave/20;                                    //average the readings



  for (int m = 0; m<avelevel; m++){                     //loop to light number of pixels
    pixels.setPixelColor(m, pixels.Color(0,150,0));     //light the average number of pixels green
    pixels.show();                                      //turn em on

  }



    pixels.setPixelColor(24, pixels.Color(0,0,0));      //turn em off
    pixels.setPixelColor(23, pixels.Color(0,0,0));
    pixels.setPixelColor(22, pixels.Color(0,0,0));
    pixels.setPixelColor(21, pixels.Color(0,0,0));
    pixels.setPixelColor(20, pixels.Color(0,0,0));
    pixels.setPixelColor(19, pixels.Color(0,0,0));
    pixels.setPixelColor(18, pixels.Color(0,0,0));
    pixels.setPixelColor(17, pixels.Color(0,0,0));
    pixels.setPixelColor(16, pixels.Color(0,0,0));
    pixels.setPixelColor(15, pixels.Color(0,0,0));
    pixels.setPixelColor(14, pixels.Color(0,0,0));
    pixels.setPixelColor(13, pixels.Color(0,0,0));
    pixels.setPixelColor(12, pixels.Color(0,0,0));
    pixels.setPixelColor(11, pixels.Color(0,0,0));
    pixels.setPixelColor(10, pixels.Color(0,0,0));
    pixels.setPixelColor(9, pixels.Color(0,0,0));
    pixels.setPixelColor(8, pixels.Color(0,0,0));
    pixels.setPixelColor(7, pixels.Color(0,0,0));
    pixels.setPixelColor(6, pixels.Color(0,0,0));
    pixels.setPixelColor(5, pixels.Color(0,0,0));
    pixels.setPixelColor(4, pixels.Color(0,0,0));
    pixels.setPixelColor(3, pixels.Color(0,0,0));
    pixels.setPixelColor(2, pixels.Color(0,0,0));
    pixels.setPixelColor(1, pixels.Color(0,0,0));
    pixels.setPixelColor(0, pixels.Color(0,0,0));
    pixels.show();



 ave=0;                                                   //reset the counter
}