Implement temperature calculation
This commit is contained in:
parent
3042194aa1
commit
8cf17dc774
@ -1,6 +1,8 @@
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#include "clock.hpp"
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#include <math.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "flash/flash.hpp"
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#include "io/io.hpp"
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@ -12,6 +14,38 @@
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#define UART0_INT_VECTORS
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#include "uart/hardware0.hpp"
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static constexpr auto SERIES_RESISTOR = 9951;
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static constexpr auto THERMISTOR_NOMINAL = 9270;
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static constexpr auto BETA_COEFFICIENT = 3212;
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static constexpr auto NOMINAL_TEMPERATURE = 25;
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template <typename Adc>
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double sampleAdc(Adc &adcPin, uint16_t numSamples = 100)
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{
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double samples = 0;
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for (uint16_t i = 0; i < numSamples; ++i)
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samples += adcPin.read();
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return samples / numSamples;
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}
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double getResistance(double adcSample)
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{
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return SERIES_RESISTOR * adcSample / (1023 - adcSample);
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}
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double getTemperature(double resistance)
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{
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double steinhart = resistance / THERMISTOR_NOMINAL;
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steinhart = log(steinhart);
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steinhart /= BETA_COEFFICIENT;
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steinhart += 1.0 / (NOMINAL_TEMPERATURE + 273.15);
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steinhart = 1.0 / steinhart;
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steinhart -= 273.15;
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return steinhart;
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}
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int main()
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{
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uart::Uart0<> serial;
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@ -25,8 +59,18 @@ int main()
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adcPin.init();
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while (true) {
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auto adcSample = adcPin.read();
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serial << F("Read ADC: ") << adcSample << F("\r\n");
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const auto adcSample = sampleAdc(adcPin, 1000);
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const auto thermistorResistance = getResistance(adcSample);
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const auto temperature = getTemperature(thermistorResistance);
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char floatBuffer[16];
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sprintf(floatBuffer, "%.2f", adcSample);
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serial << F("Read ADC: ") << floatBuffer << F("\r\n");
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sprintf(floatBuffer, "%.2f", thermistorResistance);
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serial << F("Resistance: ") << floatBuffer << F("\r\n");
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sprintf(floatBuffer, "%.2f", temperature);
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serial << F("Temperature: ") << floatBuffer << F(" C \r\n");
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_delay_ms(1000);
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}
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@ -61,118 +61,122 @@
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