//Mystepresponce Embafrsh Solomon
//Fab Academy 2021

//  Program to use transmit-receive across space between two conductors which are attached to digital pin and another to analog pin.
//
//
//  This program has a function MystepResponce() which returns a long integer value.

long value;   //variable for the result of the tx_rx measurement.
int analog_pin = A3;
int tx_pin = A2;
void setup() {
pinMode(tx_pin,OUTPUT);
Serial.begin(115200);
}


long MystepResponce(){
  int read_high;
  int read_low;
  int diff;
  long int sum;
  int SampleTaken = 100;    //Number of samples to take. As much sample as possible to reduce scatter.

  sum = 0;

  for (int i = 0; i < SampleTaken; i++){
   digitalWrite(tx_pin,HIGH);              //Step up voltage on conductor 1.
   read_high = analogRead(analog_pin);        //Measure response  on conductor 2.
   delayMicroseconds(100);            //wait untill steady state.
   digitalWrite(tx_pin,LOW);               //Step down voltage on conductor 1.
   read_low = analogRead(analog_pin);         //Measure response on conductor 2.
   diff = read_high - read_low;       //the difference on high and low readings of condutor 2.
 sum += diff;                       //Sums up N_samples of these measurements.
 }
  return sum;
}


void loop() {

value = MystepResponce();
value = map(value, 8000, 11000, 0, 1024);
Serial.println(value);
delay(100);
}