KrisKasprzak
Well-known member
I'm writing a small library for Thermistors. You pass in the measured resistance and it spits out a temp. The arduino compiler claims my definition of an array to hold constants is defined multiple times--I don't see it in my .h .cpp, .ino files.
Anything look wrong?
Code looks fine to me but I get a C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_860596\libraries\Thermistor\Thermistor.cpp.o
.data.tc+0x0): multiple definition of `tc'
C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_860596\sketch\sketch_feb20a.ino.cpp.o.data.tc+0x0): first defined here
c:/program files (x86)/arduino/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions
collect2.exe: error: ld returned 1 exit status
Error compiling for board Teensy 4.0.
.h file
. cpp file
. ino file
Anything look wrong?
Code looks fine to me but I get a C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_860596\libraries\Thermistor\Thermistor.cpp.o
.data.tc+0x0): multiple definition of `tc'C:\Users\ADMINI~1\AppData\Local\Temp\arduino_build_860596\sketch\sketch_feb20a.ino.cpp.o
.data.tc+0x0): first defined herec:/program files (x86)/arduino/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions
collect2.exe: error: ld returned 1 exit status
Error compiling for board Teensy 4.0.
.h file
Code:
/*
*/
#ifndef THERMISTOR_h
#define THERMISTOR_h
#if ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
double tc[14][11] {
{1,2880,3,-9.094,2251.74,229098,-27448200,0.003354016,0.000349502,0.000002095959,0.0000004260615},
{2,2990,3,-10.2296,2887.62,132336,-25025100,0.003354016,0.000341556,0.000004955455,0.0000004364236},
{3,3041,3,-11.1334,3658.73,-102895,516652,0.003354016,0.000334929,0.000003683843,0.0000007050455},
{4,3136,3,-12.4493,4702.74,-402687,31968300,0.003354016,0.000324388,0.000002658012,-0.000000270156},
{5,3390,3,-12.6814,4391.97,-232807,15096430,0.003354016,0.000299341,0.000002135133,-0.000000005672},
{6,3528,0.5,-12.0596,3687.667,-7617.13,-5914730,0.003354016,0.000290967,0.000001632136,0.000000071922},
{6,3528,0.5,-21.0704,11903.95,-2504699,247033800,0.003354016,0.0002933908,0.000003494314,-0.000000771269},
{7,3560,1.5,-13.0723,4190.574,-47158.4,-11992560,0.003354016,0.0002884193,0.000004118032,0.000000178679},
{8,3740,2,-13.8973,4557.725,-98275,-7522357,0.003354016,0.0002744032,0.000003666944,0.0000001375492},
{9,3977,0.75,-14.6337,4791.842,-115334,-3730535,0.003354016,0.000256985,0.000002620131,0.00000006383091},
{10,4090,1.5,-15.5322,5229.973,-160451,-5414091,0.003354016,0.0002519107,0.000003510939,0.0000001105179},
{11,4190,1.5,-16.0349,5459.339,-191141,-3328322,0.003354016,0.0002460382,0.000003405377,0.000000103424},
{12,4370,2.5,-16.8717,5759.15,-194267,-6869149,0.003354016,0.000236772,0.00000358514,0.0000001255349},
{13,4570,1.5,-17.6439,6022.726,-203157,-7183526,0.003354016,0.0002264097,0.000003278184,0.0000001097628}
};
class Thermistor {
public:
Thermistor(double B25=3977);
double getTempF(float Resistance);
double getTempC(float Resistance);
double getTempK(float Resistance);
double getTempR(float Resistance);
void setConstants(double ConstA1, double ConstB1, double ConstC1, double ConstD1);
void setNominalResistance(double R1);
void getConstants(double &ConstA1, double &ConstB1, double &ConstC1, double &ConstD1);
private:
void ComputeTemps(double Resistance);
double consta1, constb1, constc1, constd1, tempk, tempc, tempf, tempr, r1;
bool found;
};
#endif
Code:
/*
*/
#include "Thermistor.h"
Thermistor::Thermistor(double B25) {
int i = 0;
r1 = 10000.0;
found = false;
for (i = 0; i < 13; i++) {
if (tc[i][1] == B25) {
consta1 = tc[i][7];
constb1 = tc[i][8];
constc1 = tc[i][9];
constd1 = tc[i][10];
found = true;
}
}
}
double Thermistor::getTempF(float Resistance){
ComputeTemps(Resistance);
return tempf;
}
double Thermistor::getTempC(float Resistance){
ComputeTemps(Resistance);
return tempc;
}
double Thermistor::getTempK(float Resistance){
ComputeTemps(Resistance);
return tempk;
}
double Thermistor::getTempR(float Resistance){
ComputeTemps(Resistance);
return tempk;
}
void Thermistor::ComputeTemps(double Resistance){
if (found) {
tempk = 1.0 / (consta1 + (constb1 * (log(Resistance / r1))) + (constc1 * pow(log(Resistance / r1), 2)) + (constd1 * pow(log(Resistance / r1), 3)));
tempc = tempk - 273.15;
tempf = (tempc * 1.8f) + 32.0f;
tempr = tempk;
}
else {
// constants found report some error loooking temperature
tempk = -999999.99;
tempc = -999999.99;
tempf = -999999.99;
tempr = -999999.99;
}
}
void Thermistor::setConstants(double ConstA1, double ConstB1, double ConstC1, double ConstD1){
consta1 = ConstA1;
constb1 = ConstB1;
constc1 = ConstC1;
constd1 = ConstD1;
}
void Thermistor::setNominalResistance(double R1){
r1 = R1;
}
void Thermistor::getConstants(double &ConstA1, double &ConstB1, double &ConstC1, double &ConstD1){
ConstA1 = consta1;
ConstB1 = constb1;
ConstC1 = constc1;
ConstD1 = constd1;
}. ino file
Code:
#include "Thermistor.h"
int b = 0;
float volts = 0.0;
float rest = 0.0;
unsigned long t = 0;
unsigned long count;
Thermistor RoomTemp(3977);
void setup() {
Serial.begin(115200);
analogReadResolution(12);
}
void loop() {
b = b + analogRead(A0);
count ++;
if ((millis() - t) > 500) {
b = b / count;
volts = (float) b / 4096.0;
rest = ( volts * 10000) / (3.3f - volts);
Serial.print("Room Temp ");
//Serial.println(RoomTemp.getTempF(rest), 4);
count = 0;
b = 0;
t = millis();
}
}