++
/**
    This is Arduino code for Aosong Digital Temperature and Humidity Sensor.
	This code is presented as part of a Robojax tutorial.
	
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2016 Ratthanan Nalintasnai
    Modified for Robojax.com video by
    Ahmad S. on March 22, 2018 at 22:45 in Ajax, Ontario, Canada
    This code, with library and other codes, is available at
    https://robojax.com
    Watch the video instruction for this code: https://youtu.be/3ifN0FhLB5E
**/

// Include library into the sketch
#include <AM2320.h>

// Create an instance of sensor
AM2320 sensor;

void setup() {
  // enable serial communication
  Serial.begin(9600);
  Serial.print("Robojax AM2320 Demo ");
  // call sensor.begin() to initialize the library
  sensor.begin();
}

void loop() {

  // sensor.measure() returns a boolean value
  // - true indicates measurement is completed successfully
  // - false indicates that either the sensor is not ready or CRC validation failed
  //   use getErrorCode() to check for the cause of the error.
  if (sensor.measure()) {
    Serial.print("Temperature: ");
    Serial.print(temp('C'));
    Serial.print(" C, Humidity: ");
    Serial.print(sensor.getHumidity());
    Serial.println("%");
  }
  else {  // error has occurred
    int errorCode = sensor.getErrorCode();
    switch (errorCode) {
      case 1: Serial.println("ERR: Sensor is offline"); break;
      case 2: Serial.println("ERR: CRC validation failed."); break;
    }    
  }

  delay(500);
}

/*
 * temp()
 * returns temperature based on the parameter T
 * if T == 'F', will convert Celsius to Fahrenheit
 * if T is anything else or empty, will return Celsius
 * how to use:
 *  to get Fahrenheit, use temp('F')
 *  to get Celsius, use temp('C') or temp('')
 *  the temp('') uses an empty single quote 
 * 
 */
float temp(char T)
{
  if (sensor.measure()) {
    if(T =='F')
    {
      // convert to FAHRENHEIT and return
      // Robojax video tutorial
      return sensor.getTemperature()* 1.8 + 32;
    }else{
      return sensor.getTemperature();// return CELSIUS
    }

  }// if sensor.measure  
}