//Reads data from a sensor and sends it to the serial port
//Created by Gleb Bulygin for FabAcademy.
//Based on this tutorial: https://itp.nyu.edu/physcomp/labs/labs-serial-communication/serial-output-from-an-arduino/

#include <SoftwareSerial.h>
const int pResistor = A3; //sensor pin
uint16_t value; // Store value from photoresistor (0-1023) 
// ***
// *** Define the RX and TX pins. Choose any two
// *** pins that are unused. Try to avoid D0 (pin 5)
// *** and D2 (pin 7) if you plan to use I2C.
// ***
#define RX    A0   // *** D3, Pin 2 
#define TX    A1   // *** D4, Pin 3
SoftwareSerial mySerial(RX, TX);

void setup() {
  while (!mySerial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  pinMode(pResistor, INPUT);// Set pResistor - A3 pin as an input (optional)
}

void loop() {
   int value = analogRead(pResistor);   //
   map(value, 0, 1023, 0, 255);       //mapping to fit in one bit of data.
   mySerial.write(value);                 // sends the value to serial port in bin
}