diff options
| -rw-r--r-- | Detector_Building.ino | 168 | ||||
| -rw-r--r-- | Detector_Building/Detector_Building.ino | 4 |
2 files changed, 2 insertions, 170 deletions
diff --git a/Detector_Building.ino b/Detector_Building.ino deleted file mode 100644 index 9d53145..0000000 --- a/Detector_Building.ino +++ /dev/null @@ -1,168 +0,0 @@ -/* - * Detector Building - * Code by Anthony Wang - * Ladue High School Science Olympiad - */ - - -/* - * TODO: - * BUG FIXING: Expect bugs! - */ - - -// Constants -const int LED_R = 4, LED_G = 3, LED_B = 2, THERM = 0; // Device component pins -const double R_k = 10000, V_in = 5, analog_max = 1023; // Device constants - - -// Temperature conversions -inline double f2c(double f) { return (f - 32) * 5 / 9; } // Fahrenheit to Celsius -inline double c2f(double c) { return c * 9 / 5 + 32; } // Celsius to Fahrenheit -inline double k2c(double k) { return k - 273.15; } // Kelvin to Celsius -inline double c2k(double c) { return c + 273.15; } // Celsius to Kelvin -inline double f2k(double f) { return c2k(f2c(f)); } // Fahrenheit to Kelvin -inline double k2f(double k) { return c2f(k2c(k)); } // Kelvin to Fahrenheit - - -// Analog to digital conversion -inline double a2d(int a) { return V_in * a / analog_max; } -inline int d2a(double d) { return d * analog_max / V_in; } - - -// Utility functions -// No C++ standard library :( -void sort(double a[], int n) { - // Bubble sort - // Slow but n < 30 so OK - // Too lazy to implement a fast sort - for (int i = 0; i < n; i++) { - for (int j = 0; j < n - 1; j++) { - if (a[j] > a[j + 1]) { - double tmp = a[j]; - a[j] = a[j + 1]; - a[j + 1] = tmp; - } - } - } -} - - -// Calibration data -const int n = 3, m = n / 3; // Number of data points, MUST be multiple of 3 -double V[n] = { 2.5, 3.26, 3.96 }; // Voltage measurements -double T[n] = { 25, 39.15, 60 }; // Temperature measurements -double V_mid[m]; // Stores each piecewise segment for binary search -double A[m], B[m], C[m]; // Coefficients for each piecewise component - - -// Calculations -// Steinhart-hart stuff -void calculate() { - sort(V, n); - sort(T, n); - double R[n], L[n], Y[n], G[n]; - for (int i = 0; i < n; i++) R[i] = R_k * (V_in / V[i] - 1); - for (int i = 0; i < n; i++) L[i] = log(R[i]); - for (int i = 0; i < n; i++) Y[i] = 1 / c2k(T[i]); - for (int i = 0; i < n; i += 3) { - G[i + 1] = (Y[i + 1] - Y[i]) / (L[i + 1] - L[i]); - G[i + 2] = (Y[i + 2] - Y[i]) / (L[i + 2] - L[i]); - } - for (int i = 0; i < n; i += 3) { // Don't ask how this works - C[i / 3] = (G[i + 2] - G[i + 1]) / (L[i + 2] - L[i + 1]) / (L[i] + L[i + 1] + L[i + 2]); - B[i / 3] = G[i + 1] - C[i / 3] * (L[i] * L[i] + L[i] * L[i + 1] + L[i + 1] * L[i + 1]); - A[i / 3] = Y[i] - L[i] * (B[i / 3] + L[i] * L[i] * C[i / 3]); - } - for (int i = 0; i < n; i += 3) V_mid[i / 3] = (i ? (V[i - 1] + V[i]) / 2 : V[i]); -} - - -// Arduino stuff -void blink(int pin) { - digitalWrite(pin, HIGH); - delay(1000); - digitalWrite(pin, LOW); -} -void setup() { - Serial.begin(9600); - pinMode(LED_R, OUTPUT); - pinMode(LED_G, OUTPUT); - pinMode(LED_B, OUTPUT); - - // blink(LED_R); - // blink(LED_G); - // blink(LED_B); - - // Debug stuff - /*for (int i = 0; i < m; i++) { - Serial.print("Segment lower bound: "); - Serial.print(i ? V_mid[i - 1] : 0); - Serial.print(" Segment upper bound: "); - Serial.print(V_mid[i]); - Serial.print(" A: "); - Serial.print(A[i], 12); - Serial.print(" B: "); - Serial.print(B[i], 12); - Serial.print(" C: "); - Serial.print(C[i], 12); - Serial.println(); - }*/ -} - - -// Main loop -void loop() { - int V_raw = analogRead(THERM); // Read in raw analog value - double V_out = a2d(V_raw); // Convert analog to digital - double R_t = R_k * (V_in / V_out - 1); // Thermistor resistance - - int s = 0; - while (s < m && V_out > V_mid[s + 1]) s++; // Find correct segment - - double logR_t = log(R_t); - double K = 1.0 / (A[s] + B[s] * logR_t + C[s] * logR_t * logR_t * logR_t); // Steinhart-hart - double C = k2c(K); - double F = c2f(C); - - // LED stuff - if (C <= 25) { - digitalWrite(LED_R, LOW); - digitalWrite(LED_G, LOW); - digitalWrite(LED_B, HIGH); - } - else if (C <= 50) { - digitalWrite(LED_R, LOW); - digitalWrite(LED_G, HIGH); - digitalWrite(LED_B, LOW); - } - else if (C <= 75) { - digitalWrite(LED_R, HIGH); - digitalWrite(LED_G, LOW); - digitalWrite(LED_B, LOW); - } - else { - 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); - Serial.print(" Temperature (°F): "); // For reference - Serial.print(F); - - // Debug stuff - /*Serial.print(" Segment lower bound: "); - Serial.print(s ? V_mid[s - 1] : 0); - Serial.print(" Segment upper bound: "); - Serial.print(V_mid[s]);*/ - - Serial.println(); - delay(500); -} diff --git a/Detector_Building/Detector_Building.ino b/Detector_Building/Detector_Building.ino index e9e71f1..9d53145 100644 --- a/Detector_Building/Detector_Building.ino +++ b/Detector_Building/Detector_Building.ino @@ -32,14 +32,14 @@ inline int d2a(double d) { return d * analog_max / V_in; } // Utility functions // No C++ standard library :( -void sort(int& a[], int n) { +void sort(double a[], int n) { // Bubble sort // Slow but n < 30 so OK // Too lazy to implement a fast sort for (int i = 0; i < n; i++) { for (int j = 0; j < n - 1; j++) { if (a[j] > a[j + 1]) { - int tmp = a[j]; + double tmp = a[j]; a[j] = a[j + 1]; a[j + 1] = tmp; } |