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/*
Detector Building v2
Code by Anthony Wang
Ladue High School Science Olympiad
*/
/*
TODO:
New calibration method using cubic regression
*/
#include <curveFitting.h>
#include <detectorBuilding.h>
const bool CALIB = false; // Calibration mode
const int n = 17; // Number of data points
const int m = 1; // Number of segments
const int deg = 2; // Regression degree
double V[n] = { // Voltage measurements
2.70, 3.39, 2.40, 2.31, 2.19, 1.94, 4.09, 4.11, 3.98, 3.92, 3.77, 3.53, 3.18, 3.07, 2.30, 2.53, 2.49
};
double T[n] = { // Temperature measurements
24.0, 44.4, 18.4, 13.9, 11.2, 8.6, 60.8, 62.0, 58.3, 53.9, 49.3, 44.9, 41.0, 37.3, 13.4, 19.1, 18.2
};
double coeff[m][deg + 1];
void setup() {
Serial.begin(9600);
pinMode(LED_R, OUTPUT);
pinMode(LED_G, OUTPUT);
pinMode(LED_B, OUTPUT);
sort(V, n);
sort(T, n);
double x[n], y[n];
for (int i = 0; i < n; i++) x[i] = log(v2r(V[i])) - 7;
for (int i = 0; i < n; i++) y[i] = 1000 / c2k(T[i]);
for (int i = 0; i < n; i++) {
Serial.print("(");
Serial.print(x[i], 12);
Serial.print(", ");
Serial.print(y[i], 12);
Serial.print(")");
Serial.println();
}
for (int i = 0; i < m; i++) {
int ret = fitCurve(deg, n / m, x + i * n / m, y + i * n / m, deg + 1, coeff[i]);
if (ret == 0){ //Returned value is 0 if no error
char c = 'A';
Serial.println("Coefficients are:");
for (int j = 0; j <= deg; j++){
Serial.print(c++);
Serial.print(": ");
Serial.print(coeff[i][j], 12);
Serial.println();
}
}
}
}
void loop() {
int V_raw = analogRead(THERM); // Read in raw analog value
double V_out = a2d(V_raw);
if (CALIB) {
// Calibration mode
Serial.print("Raw analog reading: ");
Serial.print(V_raw);
Serial.print(" Voltage (V): ");
Serial.print(V_out);
Serial.println();
delay(500);
return;
}
int s = 0;
while (s + 1 < m && V_out < (V[s * n / m - 1] + V[s * n / m]) / 2) s++; // Find correct segment
double logR = log(v2r(V_out)) - 7;
double sum = 0, prod = 1;
for (int i = 0; i <= deg; i++) {
sum += coeff[s][deg - i] * prod;
prod *= logR;
}
double K = 1000 / sum;
double C = k2c(K);
double F = c2f(C);
// LED stuff
if (C <= 30) { // Cold
digitalWrite(LED_R, LOW);
digitalWrite(LED_G, LOW);
digitalWrite(LED_B, HIGH);
}
else if (C <= 50) { // Medium
digitalWrite(LED_R, LOW);
digitalWrite(LED_G, HIGH);
digitalWrite(LED_B, LOW);
}
else if (C <= 75) { // Hot
digitalWrite(LED_R, HIGH);
digitalWrite(LED_G, LOW);
digitalWrite(LED_B, LOW);
}
else { // Something seriously wrong
digitalWrite(LED_R, HIGH);
digitalWrite(LED_G, HIGH);
digitalWrite(LED_B, HIGH);
}
// Output voltage, temperature
Serial.print("Raw analog reading: ");
Serial.print(V_raw);
Serial.print(" Voltage (V): ");
Serial.print(V_out);
Serial.print(" Temperature (°C): ");
Serial.print(C);
// For reference
/*Serial.print(" Temperature (°F): ");
Serial.print(F);
Serial.print(" s: ");
Serial.print(s);
Serial.print(" logR: ");
Serial.print(logR);*/
Serial.println();
delay(500);
return;
}
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