/*
 * NAME: LuminoxO2_PlosOne-sketch
 * 
 * BY: Paul O'Neill
 * 
 * Written for ESP8266 'Amica' ESP-12E module
  Receives from software serial port, sends to hardware serial port.
   RX is digital pin 13 (connect to TX of level shifter: pin B1)
   TX is digital pin 15 (connect to RX of level shifter: pin B2)

   Seperate 5V power applied to Luminox O2 sensor
   Pin 1 LuminoxO2 goes to TENMA Regulated Power Supply plus terminal set at 5V
   Pin 2 LuminoxO2 goes to TENMA Regulated Power Supply minus terminal
   Pin 3 LuminoxO2-Tx goes to Amica GPIO13 (RXD2)
   Pin 4 LuminoxO2-Rx goes to Amica GPIO15 (TXD2)  
  Loosely adapted from a public domain program written by S.P. Mathupala, Ph.D.
*/

#include <SoftwareSerial.h>                //incorporate software-serial libray

SoftwareSerial myserial(13, 15);           //enable software serial port 10 to RX, and 11 to TX
long delayPeriod;                          //introduce the variable delayPeriod
String Luminoxstring = "";                 //string to hold incoming data from Luminox-O2 sensor
boolean Luminox_stringcomplete = false;    //were all data from Luminox-O2 sensor received? check

void setup()
{
  Serial.begin(9600);                       //set baud rate for Arduino serial port to 9600
  myserial.begin(9600);                     //set baud rate for software serial port to 9600
  Luminoxstring.reserve(41);                //set aside 41 bytes for receiving data from Luminox-O2 sensor
}

void serialEvent()                          //arduino.cc/en/Tutorial/SerialEvent
{
  delayPeriod = 1000;
  String inchar = "";                      //setup a string to hold incoming char
  while (Serial.available() > 0) {         //when a char is avaialble in serial buffer
    inchar += (char)Serial.read();        //grab that char
    //      if (inchar == "m")                    //if the char is a "m"
    //      delayPeriod = 300000;                 //set delay period to 5 minutes (300000 milli seconds)
    if (inchar == "s")                    //if char is a "s"
      delayPeriod = 1000;                   //set delay period to 1 second (1000 milli seconds)
  }
}

void loop()
{
  { // Serial.print(".");                                          //start the loop sequence
    while (myserial.available()) {            //when a char is avaialable in software serial buffer
      char inchar = (char)myserial.read();    //grab that char
      Luminoxstring += inchar;                //add the received char to LuminoxString
      if (inchar == '\r') {                   //if the incoming character is a <term>, reset
        Luminox_stringcomplete = true;        //then a complete string of data has been recieved from Luminox-O2 sensor
      }
    }

    if (Luminox_stringcomplete) {              //has a complete string from the Luminox sensor has been received?
      Luminoxstring.remove(80);                //remove any serial string overruns between reads
      Serial.print(Luminoxstring);             //use the Arduino serial port to send that data to CoolTerm
      Luminoxstring = "";                      //then clear the Luminoxstring:
      Luminox_stringcomplete = false;          //await the next data string from Luminox-O2 sensor
      delay(delayPeriod);                      //pause for 5 minutes(300000 millis); or 1 second (1000 millis)
    }
  }
}