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corrected some typos in RTD_V1.cpp comments
changed datatype of adcRaw from unsigned long to long
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Lines changed: 117 additions & 117 deletions

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‎RTD_v1.cpp‎

Lines changed: 117 additions & 117 deletions
Original file line numberDiff line numberDiff line change
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/*************************************************************************
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* RTD shield libary - Version 1
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* by Christodoulos P. Lekkos <tolis81@gmail.com> , August 10, 2012.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either the GNU General Public License version 3
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* published by the Free Software Foundation.
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*************************************************************************/
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#if defined(ARDUINO) && ARDUINO >= 100
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#include <Arduino.h>
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#else
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#include <WProgram.h>
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#endif
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#include <RTD_v1.h>
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#include <../SPI/SPI.h>
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#define WIRE_COMP_OFFSET -0.7 // mV
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#define VREF 2.31 // reference voltage (V)
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#define IEX 0.9537 // excitation current (mA)
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#define EOCPIN 12 // EOC pin for conversion monitoring
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const int _muxPin[] = {5, 4, 3}; // pins used for multiplexing
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const int _csPin = 10; // ADC cs pin
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int _muxPinState[] = {0, 0, 0}; // array to store current channel configuration
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RTD::RTD(int nChannel)
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{
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_nChannel = nChannel;
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for (int i = 0; i < 3; i++) pinMode(_muxPin[i], OUTPUT); // configure the multiplexer pins
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}
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void RTD::ADC_INIT() // function to initialize a measurement after the appropriate channel has been choosen
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{
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digitalWrite(_csPin, LOW);
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byte initByte = SPI.transfer(0x00);
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digitalWrite(_csPin, HIGH);
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}
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void RTD::MUX_SELECT(int _nChannel) // function for channel selection
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{
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_muxPinState[0] = bitRead(_nChannel,0);
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_muxPinState[1] = bitRead(_nChannel,1);
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_muxPinState[2] = bitRead(_nChannel,2);
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digitalWrite(_muxPin[0], _muxPinState[0]);
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digitalWrite(_muxPin[1], _muxPinState[1]);
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digitalWrite(_muxPin[2], _muxPinState[2]);
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//Serial.print("Channel Selected: "); // uncomment for debugging
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//Serial.println(_nChannel); // uncomment for debugging
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}
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long RTD::ADC_READ() // function to read the ADC
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{
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digitalWrite(_csPin, LOW);
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if (digitalRead(EOCPIN))
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{
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//Serial.println("!EOC"); // uncomment for debugging
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digitalWrite(_csPin, HIGH);
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ADC_READ();
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}
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else
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{
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byte adcByte = SPI.transfer(0x00);
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//Serial.println(adcByte, BIN); // uncomment for debugging
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adcByte &= 0x0F;
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//Serial.println(adcByte, BIN); // uncomment for debugging
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unsigned long adcValue = adcByte << 8;
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adcByte = SPI.transfer(0x00);
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//Serial.println(adcByte, BIN); // uncomment for debugging
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adcValue |= adcByte;
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adcValue <<= 8;
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adcByte = SPI.transfer(0x00);
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//Serial.println(adcByte, BIN); // uncomment for debugging
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adcValue |= adcByte;
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digitalWrite(_csPin, HIGH);
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return adcValue;
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}
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}
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double RTD::ADC_2_mV(unsigned long adcRaw) // convert raaw ADC data to mV
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{
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double mV = (double)adcRaw*0.00000095367431640625*(double)VREF*1000 + (double)WIRE_COMP_OFFSET;
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//Serial.println(mV); // uncomment for debugging
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return mV;
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}
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double RTD::OHM2CELSIUS(double mVadc) // calculate temperature from mV (degree Celcius)
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{
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double ohm = mVadc / (double)IEX;
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double celsius = (0.000000003*ohm*ohm*ohm*ohm - 0.000001*ohm*ohm*ohm + 0.0013*ohm*ohm + 2.3141*ohm - 243.85);
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//double celsius = 3*pow(10, -9)*pow(ohm, 4)-1*pow(10, -6)*pow(ohm, 3)+0.0013*pow(ohm, 2)+2.3141*ohm - 243.85;
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//Serial.println(ohm); // uncomment for debugging
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return celsius;
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}
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double RTD::tempC() // main function to read the RTD temperature in degree Celsius
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{
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MUX_SELECT(_nChannel);
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ADC_INIT();
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long adcRaw = ADC_READ();
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double rtdTempC = OHM2CELSIUS(ADC_2_mV(adcRaw));
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return rtdTempC;
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}
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double RTD::tempK() // convert to Kelvin
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{
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double rtdTempK = tempC();
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rtdTempK += 273.0;
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return rtdTempK;
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}
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double RTD::tempF() // convert to degree Fahrenheit
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{
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double rtdTempF = tempC();
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rtdTempF = (rtdTempF*9/5)+32;
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return rtdTempF;
1+
/*************************************************************************
2+
* RTD shield libary - Version 1
3+
* by Christodoulos P. Lekkos <tolis81@gmail.com> , August 10, 2012.
4+
*
5+
* This file is free software; you can redistribute it and/or modify
6+
* it under the terms of either the GNU General Public License version 3
7+
* published by the Free Software Foundation.
8+
*************************************************************************/
9+
10+
#if defined(ARDUINO) && ARDUINO >= 100
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#include <Arduino.h>
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#else
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#include <WProgram.h>
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#endif
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#include <RTD_v1.h>
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#include <../SPI/SPI.h>
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#define WIRE_COMP_OFFSET -0.7 // mV
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#define VREF 2.31 // reference voltage (V)
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#define IEX 0.9537 // excitation current (mA)
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#define EOCPIN 12 // !EOC pin for conversion monitoring
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const int _muxPin[] = {5, 4, 3}; // pins used for multiplexing
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const int _csPin = 10; // ADC cs pin
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int _muxPinState[] = {0, 0, 0}; // array to store current channel configuration
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RTD::RTD(int nChannel)
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{
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_nChannel = nChannel;
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for (int i = 0; i < 3; i++) pinMode(_muxPin[i], OUTPUT); // configure the multiplexer pins
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}
33+
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void RTD::ADC_INIT() // function to initialize a measurement after the appropriate channel has been choosen
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{
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digitalWrite(_csPin, LOW);
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byte initByte = SPI.transfer(0x00);
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digitalWrite(_csPin, HIGH);
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}
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void RTD::MUX_SELECT(int _nChannel) // function for channel selection
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{
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_muxPinState[0] = bitRead(_nChannel,0);
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_muxPinState[1] = bitRead(_nChannel,1);
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_muxPinState[2] = bitRead(_nChannel,2);
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digitalWrite(_muxPin[0], _muxPinState[0]);
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digitalWrite(_muxPin[1], _muxPinState[1]);
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digitalWrite(_muxPin[2], _muxPinState[2]);
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//Serial.print("Channel Selected: "); // uncomment for debugging
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//Serial.println(_nChannel); // uncomment for debugging
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}
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long RTD::ADC_READ() // function to read the ADC
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{
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digitalWrite(_csPin, LOW);
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if (digitalRead(EOCPIN))
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{
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//Serial.println("!EOC"); // uncomment for debugging
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digitalWrite(_csPin, HIGH);
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ADC_READ();
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}
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else
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{
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byte adcByte = SPI.transfer(0x00);
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//Serial.println(adcByte, BIN); // uncomment for debugging
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adcByte &= 0x0F;
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//Serial.println(adcByte, BIN); // uncomment for debugging
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long adcValue = adcByte << 8;
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adcByte = SPI.transfer(0x00);
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//Serial.println(adcByte, BIN); // uncomment for debugging
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adcValue |= adcByte;
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adcValue <<= 8;
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adcByte = SPI.transfer(0x00);
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//Serial.println(adcByte, BIN); // uncomment for debugging
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adcValue |= adcByte;
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digitalWrite(_csPin, HIGH);
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return adcValue;
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}
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}
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double RTD::ADC_2_mV(long adcRaw) // convert raw ADC data to mV
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{
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double mV = (double)adcRaw*0.00000095367431640625*(double)VREF*1000 + (double)WIRE_COMP_OFFSET;
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//Serial.println(mV); // uncomment for debugging
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return mV;
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}
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double RTD::OHM2CELSIUS(double mVadc) // calculate temperature from mV (degree Celcius)
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{
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double ohm = mVadc / (double)IEX;
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double celsius = (0.000000003*ohm*ohm*ohm*ohm - 0.000001*ohm*ohm*ohm + 0.0013*ohm*ohm + 2.3141*ohm - 243.85);
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//double celsius = 3*pow(10, -9)*pow(ohm, 4)-1*pow(10, -6)*pow(ohm, 3)+0.0013*pow(ohm, 2)+2.3141*ohm - 243.85;
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//Serial.println(ohm); // uncomment for debugging
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return celsius;
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}
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double RTD::tempC() // main function to read the RTD temperature in degree Celsius
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{
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MUX_SELECT(_nChannel);
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ADC_INIT();
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long adcRaw = ADC_READ();
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double rtdTempC = OHM2CELSIUS(ADC_2_mV(adcRaw));
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return rtdTempC;
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}
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double RTD::tempK() // convert to Kelvin
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{
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double rtdTempK = tempC();
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rtdTempK += 273.0;
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return rtdTempK;
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}
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double RTD::tempF() // convert to degree Fahrenheit
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{
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double rtdTempF = tempC();
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rtdTempF = (rtdTempF*9/5)+32;
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return rtdTempF;
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}

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