Merge branch 'thermistor-temp' into main

prosjekt.X/main.c

@@ -20,6 +20,8 @@
 #include "uart.h"
 #include <avr/io.h>
 #include <util/delay.h>
+#include <stdint.h>
+#include "themistor-temp.h"
 
 int main() {
   init_uart((uint16_t)9600);

prosjekt.X/nbproject/configurations.xml

@@ -6,10 +6,16 @@
                    projectFiles="true">
       <itemPath>command-handler.h</itemPath>
       <itemPath>i2c.h</itemPath>
+      <itemPath>themistor-temp.h</itemPath>
       <itemPath>uart.h</itemPath>
       <itemPath>eeprom.h</itemPath>
       <itemPath>voltage.h</itemPath>
     </logicalFolder>
+    <logicalFolder name="ExternalFiles"
+                   displayName="Important Files"
+                   projectFiles="true">
+      <itemPath>Makefile</itemPath>
+    </logicalFolder>
     <logicalFolder name="LinkerScript"
                    displayName="Linker Files"
                    projectFiles="true">
@@ -18,17 +24,10 @@
                    displayName="Source Files"
                    projectFiles="true">
       <itemPath>main.c</itemPath>
-      <itemPath>command-handler.c</itemPath>
-      <itemPath>i2c.c</itemPath>
       <itemPath>uart.c</itemPath>
       <itemPath>eeprom.c</itemPath>
       <itemPath>voltage.c</itemPath>
     </logicalFolder>
-    <logicalFolder name="ExternalFiles"
-                   displayName="Important Files"
-                   projectFiles="false">
-      <itemPath>Makefile</itemPath>
-    </logicalFolder>
   </logicalFolder>
   <projectmakefile>Makefile</projectmakefile>
   <confs>

prosjekt.X/themistor-temp.h

@@ -0,0 +1,47 @@
+/* 
+ * File:   themistor-temp.h
+ * Author: athamantis
+ *
+ * Created on 08 March 2024, 11:46
+ */
+
+#ifndef THEMISTOR_TEMP_H
+#define	THEMISTOR_TEMP_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <float.h>    
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <math.h>
+#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
+// Returns the thermistor themperature 
+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 alert_voltage_threshold_exceeded(bool voltage_threshold_bool);
+
+// Initialise led
+void init_led();
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* THEMISTOR_TEMP_H */
+

prosjekt.X/thermistor-temp.c

@@ -0,0 +1,49 @@
+#include "themistor-temp.h"
+
+
+void init_led(){
+    PORTB.DIRSET = ledpin;    
+}
+
+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; 
+    }
+}