text: /*
   * grove_temp.cpp
   *
   * Copyright (c) 2012 seeed technology inc.
   * Website    : www.seeed.cc
   * Author     : Jack Shao (jacky.shaoxg@gmail.com)
   *
   * The MIT License (MIT)
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include "suli2.h"
  #include "grove_temp.h"
  #include "math.h"
  
  GroveTemp::GroveTemp(int pin)
  {
      this->io = (ANALOG_T *)malloc(sizeof(ANALOG_T));
  
      suli_analog_init(io, pin);
  }
  
  bool GroveTemp::read_temp(float *temperature)
  {
      int B=4275;                  //B value of the thermistor NCP18WF104F03RC
      int R0 = 100000;
      float R;
  
      float v = suli_analog_voltage(io);
      if (v == 0.0f) v = 0.000001f;
  
      R = (float)(SULI_PLATFORM_VCC / v - 1) * R0; //get the resistance of the sensor;
  
      *temperature = 1 / (log(R / R0) / B + 1 / 298.15) - 273.15; //convert to temperature via datasheet ;
  
      return true;
  }
  
  