feat(nodes): adding thermometer and hygrometer

Changed sensor value retrieval to return error_code

nodes/prj.conf

@@ -1 +1,3 @@
 CONFIG_GPIO=y
+CONFIG_SENSOR=y
+CONFIG_I2C=y

nodes/src/ble_advertiser.c

@@ -4,6 +4,11 @@ enum error_code ble_init(){
     return success;
 }
 
-enum error_code ble_advertise(){
+enum error_code ble_advertise(
+    int co2_lvl_value_ptr, 
+    int hygro_value_ptr, 
+    int thermo_value_ptr, 
+    enum window_status window_value_ptr
+){
     return success;
 }

nodes/src/ble_advertiser.h

@@ -2,8 +2,14 @@
 #define BLE_ADVERTISER_H
 
 #include "error_code.h"
+#include "window_status.h"
 
 enum error_code ble_init();
-enum error_code ble_advertise();
+enum error_code ble_advertise(
+    int co2_lvl_value_ptr, 
+    int hygro_value_ptr, 
+    int thermo_value_ptr, 
+    enum window_status window_value_ptr
+);
 
 #endif //BLE_ADVERTISER_H

nodes/src/co2_level.c

@@ -6,6 +6,6 @@ enum error_code co2_lvl_init(){
     return success;
 }
 
-int co2_lvl_get_value(){
+enum error_code co2_lvl_get_value(int* holder){
-    return 0;
+    return success;
 }

nodes/src/co2_level.h

@@ -6,6 +6,6 @@
 extern const int CO2_LEVEL_EMPTY_ROOM;  // [ppm]
 
 enum error_code co2_lvl_init();
-int co2_lvl_get_value();
+enum error_code co2_lvl_get_value(int* holder);
 
 #endif //CO2_LEVEL_H

nodes/src/error_code.h

@@ -1,9 +1,12 @@
 #ifndef ERROR_CODE_H
 #define ERROR_CODE_H
 
+#include <limits.h>
+
 enum error_code{
     success = 0,
     init_failed,
+    read_failed,
     error_unknown,
     error_code_last,    // iteration purpose
 };

nodes/src/hygrometer.c

@@ -1,9 +1,21 @@
 #include "hygrometer.h"
 
+static const struct device* dev = DEVICE_DT_GET_ONE(st_hts221);
+
 enum error_code hygro_init(){
-    return success;
+    enum error_code ret = init_failed;
+    if(device_is_ready(dev)){
+        ret = success;
+    }else{}
+    return ret;
 }
 
-int hygro_get_value(){
+enum error_code hygro_get_value(int* holder){
-    return 0;
+    enum error_code ret = read_failed;
+    struct sensor_value humidity;
+    if(sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &humidity) >= 0){
+        *holder = sensor_value_to_deci(&humidity);
+        ret = success;
+    }else{}
+    return ret;
 }

nodes/src/hygrometer.h

@@ -1,9 +1,13 @@
 #ifndef HYGROMETER_H
 #define HYGROMETER_H
 
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/sensor.h>
+
 #include "error_code.h"
 
 enum error_code hygro_init();
-int hygro_get_value();
+enum error_code hygro_get_value(int* holder);
 
 #endif //HYGROMETER_H

nodes/src/supervisor.c

@@ -28,15 +28,16 @@ enum error_code supervisor_run(){
     int hygro_value = -1;
     int thermo_value = -1;
     enum window_status window_value = unknown;
+    enum error_code co2_lvl_status, hygro_status, thermo_status, window_status;
     int current_sleep_time = SLEEP_MIN_DURATION;
     while(1){
-        co2_lvl_value = co2_lvl_get_value();
+        co2_lvl_status = co2_lvl_get_value(&co2_lvl_value);
-        hygro_value = hygro_get_value();
+        hygro_status = hygro_get_value(&hygro_value);
-        thermo_value = thermo_get_value();
+        thermo_status = thermo_get_value(&thermo_value);
-        window_value = window_get_value();
+        window_status = window_get_value(&window_value);
         // maybe change arguments order
         // todo : manage special values
-        ble_advertise(co2_lvl_value, hygro_value, thermo_value, window_value);
+        ble_advertise(co2_lvl_value, hygro_value, thermo_value, window_status);
         if((co2_lvl_value > CO2_LEVEL_EMPTY_ROOM) || (window_value == open)){
             // there are people in the room, or someone forgot to close the window
             current_sleep_time = SLEEP_MIN_DURATION;

nodes/src/thermometer.c

@@ -1,9 +1,21 @@
 #include "thermometer.h"
 
+static const struct device* dev = DEVICE_DT_GET_ONE(st_hts221);
+
 enum error_code thermo_init(){
-    return success;
+    enum error_code ret = init_failed;
+    if(device_is_ready(dev)){
+        ret = success;
+    }else{}
+    return ret;
 }
 
-int thermo_get_value(){
+enum error_code thermo_get_value(int* holder){
-    return 0;
+    enum error_code ret = read_failed;
+    struct sensor_value temp;
+    if(sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp) >= 0){
+        *holder = sensor_value_to_deci(&temp);
+        ret = success;
+    }else{}
+    return ret;
 }

nodes/src/thermometer.h

@@ -1,9 +1,13 @@
 #ifndef THERMOMETER_H
 #define THERMOMETER_H
 
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/sensor.h>
+
 #include "error_code.h"
 
 enum error_code thermo_init();
-int thermo_get_value();
+enum error_code thermo_get_value(int* holder);
 
 #endif //THERMOMETER_H

nodes/src/window_status.c

@@ -4,6 +4,6 @@ enum error_code window_init(){
     return success;
 }
 
-int window_get_value(){
+enum error_code window_get_value(enum window_status* holder){
     return 0;
 }

nodes/src/window_status.h

@@ -11,6 +11,6 @@ enum window_status{
 };
 
 enum error_code window_init();
-int window_get_value();
+enum error_code window_get_value(enum window_status* holder);
 
 #endif //WINDOW_STATUS_