Fix variable name and led

prosjekt.X/themistor-temp.h

@@ -18,10 +18,12 @@ extern "C" {
 #include <stdlib.h>
 #include <stdint.h>
 #include <math.h>
-#define R_t0 10000
+#include <avr/io.h>
+#define R_T0 10000
 #define T_0 298.15
 #define B 3950
 #define R_1 1000
+#define ledpin PIN3_bm
     
 // Takes inn messured value 
 // Calculates the temperature in celcius
@@ -32,8 +34,10 @@ float calculate_thermistor_temp(float readValue);
 // Returns true if temperatur is higher than max_temp   
 bool voltage_threshold_bool(float thermistor_temp, uint8_t max_temp);
 
-void voltage_threshold_exceeded(bool voltage_threshold_bool);
+void alert_voltage_threshold_exceeded(bool voltage_threshold_bool);
 
+// Initialise led
+void init_led();
 
 #ifdef	__cplusplus
 }

prosjekt.X/thermistor-temp.c

@@ -1,46 +1,49 @@
 #include "themistor-temp.h"
 
+
+void init_led(){
+    PORTB.DIRSET = ledpin;    
+}
+
 float calculate_thermistor_temp(float thermistor_voltage){
-    float R_therm;
+    float R_thermistor;
     float V_1;
     float ln; 
-    float T_therm;
-    float V_therm;
-    uint8_t V_tot = 5;
+    float T_thermistor;
+    float V_thermistor;
+    #define V_TOT 5
     // Calculate Voltage over thermistor
-    V_therm = (V_tot/1024)*thermistor_voltage;
+    V_thermistor = (V_TOT/1024)*thermistor_voltage;
     
     // Voltage accross R_1
-    V_1 = V_tot - V_therm; 
+    V_1 = V_TOT - V_thermistor; 
     
     // Calculate Thermistor resistanse
-    R_therm = (V_therm)/ (V_1 / R_1);
+    R_thermistor = (V_thermistor)/ (V_1 / R_1);
     
     // Steinhart-Harts formula
-    ln = log(R_therm/R_t0);
-    T_therm = (1/ ((ln/B) + (1/T_0)));
+    ln = log(R_thermistor/R_T0);
+    T_thermistor = (1/ ((ln/B) + (1/T_0)));
     
     // Temperatur in celcius
-    T_therm -= 273.15;
+    T_thermistor -= 273.15;
     
-    return T_therm;
+    return T_thermistor;
 }
 
 // returns error message if the messured thermistor temp is higher than
 // Choosen max_temp
 bool voltage_threshold_bool(float thermistor_temp, uint8_t max_temp){
     // Return true if temp is higher then max value
-    if (thermistor_temp >= max_temp){
-        return true;
-    }
-    else {
-        return false;
-    }
+    return (thermistor_temp >= max_temp);
 }
 
 //print if the maximum threshold is exceeded. 
-void voltage_threshold_exceeded(bool voltage_threshold_bool){
+void alert_voltage_threshold_exceeded(bool voltage_threshold_bool){
     if (voltage_threshold_bool){
         printf("Error: maximum temperature exceeded");
+        PORTB.OUTSET = ledpin; 
+    }  else{
+        PORTB.OUTCLR = ledpin; 
     }
 }