Add sources

prosjekt.X/eeprom.h

@@ -19,6 +19,10 @@ extern "C" {
 #include <avr/eeprom.h>
 #include <stdbool.h>
 
+// The code is inspired by "EEPROM handling" form avr-libc
+// web link: https://www.nongnu.org/avr-libc/user-manual/group__avr__eeprom.html
+
+
 // Struct for information on the controller.
 typedef struct {
     uint16_t ms_fanspeed_sample_rate;

prosjekt.X/fan_speeeed.h

@@ -29,7 +29,6 @@ extern "C" {
      * and inspiration form practice 6 for TCA0 setup
      */
 
-    
     // INITALICE TIMER COUNTER
     void init_TCA0();
 

prosjekt.X/thermistor-temp.c

@@ -5,6 +5,9 @@ void init_led(){
     PORTB.DIRSET = ledpin;    
 }
 
+// The code is inspired by "Arduino thermistor guide" by valtentina Vogelman, 1 november 2023
+// https://www.build-electronic-circuits.com/arduino-thermistor/
+
 float calculate_thermistor_temp(float thermistor_voltage){
     float R_thermistor;
     float V_1;

prosjekt.X/thermistor-temp.c.save

@@ -0,0 +1,52 @@
+#include "themistor-temp.h"
+
+
+void init_led(){
+    PORTB.DIRSET = ledpin;    
+}
+
+
+https://www.build-electronic-circuits.com/arduino-thermistor/
+
+float calculate_thermistor_temp(float thermistor_voltage){
+    float R_thermistor;
+    float V_1;
+    float ln; 
+    float T_thermistor;
+    float V_thermistor;
+    #define V_TOT 5
+    // Calculate Voltage over thermistor
+    V_thermistor = (V_TOT/1024)*thermistor_voltage;
+    
+    // Voltage accross R_1
+    V_1 = V_TOT - V_thermistor; 
+    
+    // Calculate Thermistor resistanse
+    R_thermistor = (V_thermistor)/ (V_1 / R_1);
+    
+    // Steinhart-Harts formula
+    ln = log(R_thermistor/R_T0);
+    T_thermistor = (1/ ((ln/B) + (1/T_0)));
+    
+    // Temperatur in celcius
+    T_thermistor -= 273.15;
+    
+    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
+    return (thermistor_temp >= max_temp);
+}
+
+//print if the maximum threshold is exceeded. 
+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; 
+    }
+}

prosjekt.X/voltage.c

@@ -17,6 +17,7 @@ void ADC0_init(void) {
   VREF.ADC0REF = VREF_REFSEL_VDD_gc;  /* Internal reference */
   ADC0.CTRLA = ADC_ENABLE_bm          /* ADC Enable: enabled */
                | ADC_RESSEL_10BIT_gc; /* 10-bit mode */
+
   /* Select ADC channel */
   ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc;
 }