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Implement temperature calculation

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This commit is contained in:
BlackMark 2020-03-29 06:20:21 +02:00
parent 3042194aa1
commit 8cf17dc774
2 changed files with 157 additions and 109 deletions
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48
thermistor/main.cpp
View File

@ -1,6 +1,8 @@
#include "clock.hpp" #include "clock.hpp"
#include <math.h>
#include <stdint.h> #include <stdint.h>
#include <stdio.h>
#include "flash/flash.hpp" #include "flash/flash.hpp"
#include "io/io.hpp" #include "io/io.hpp"
@ -12,6 +14,38 @@
#define UART0_INT_VECTORS #define UART0_INT_VECTORS
#include "uart/hardware0.hpp" #include "uart/hardware0.hpp"
static constexpr auto SERIES_RESISTOR = 9951;
static constexpr auto THERMISTOR_NOMINAL = 9270;
static constexpr auto BETA_COEFFICIENT = 3212;
static constexpr auto NOMINAL_TEMPERATURE = 25;
template <typename Adc>
double sampleAdc(Adc &adcPin, uint16_t numSamples = 100)
{
double samples = 0;
for (uint16_t i = 0; i < numSamples; ++i)
samples += adcPin.read();
return samples / numSamples;
}
double getResistance(double adcSample)
{
return SERIES_RESISTOR * adcSample / (1023 - adcSample);
}
double getTemperature(double resistance)
{
double steinhart = resistance / THERMISTOR_NOMINAL;
steinhart = log(steinhart);
steinhart /= BETA_COEFFICIENT;
steinhart += 1.0 / (NOMINAL_TEMPERATURE + 273.15);
steinhart = 1.0 / steinhart;
steinhart -= 273.15;
return steinhart;
}
int main() int main()
{ {
uart::Uart0<> serial; uart::Uart0<> serial;
@ -25,8 +59,18 @@ int main()
adcPin.init(); adcPin.init();
while (true) { while (true) {
auto adcSample = adcPin.read(); const auto adcSample = sampleAdc(adcPin, 1000);
serial << F("Read ADC: ") << adcSample << F("\r\n"); const auto thermistorResistance = getResistance(adcSample);
const auto temperature = getTemperature(thermistorResistance);
char floatBuffer[16];
sprintf(floatBuffer, "%.2f", adcSample);
serial << F("Read ADC: ") << floatBuffer << F("\r\n");
sprintf(floatBuffer, "%.2f", thermistorResistance);
serial << F("Resistance: ") << floatBuffer << F("\r\n");
sprintf(floatBuffer, "%.2f", temperature);
serial << F("Temperature: ") << floatBuffer << F(" C \r\n");
_delay_ms(1000); _delay_ms(1000);
} }

218
thermistor/thermistor.cppproj
View File

@ -61,118 +61,122 @@
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