From 0f080312ab683e69a3c7fc210ab572427761ca99 Mon Sep 17 00:00:00 2001
From: Brian Rogers <captbrogers@gmail.com>
Date: Tue, 5 Apr 2022 09:08:52 -0600
Subject: [PATCH] changed from json to csv

---
 src/main.c | 76 ++++++++++++++++--------------------------------------
 1 file changed, 22 insertions(+), 54 deletions(-)

diff --git a/src/main.c b/src/main.c
index 2617871..e63ebd0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -112,78 +112,44 @@ void print_sensor_data(struct bme280_data *sensor_readings_data)
 #endif
 }
 
-int8_t save_data_to_json_file(struct bme280_data *sensor_readings_data)
+int8_t save_data_to_csv_file(struct bme280_data *sensor_readings_data)
 {
     time_t rawtime = time(NULL);
     struct tm *timeinfo;
     char dateString[32];
-    char timeString[32];
+    char datetimeString[32];
     char filename[100];
-    char *jsonBuffer;
-    FILE *jsonFilePtr;
+    FILE *csvFilePtr;
 
-    double fahrenheit;
-    double celsius;
-    double pascals;
-    double millibars;
-    double humidity;
-
-    struct json_object *parsed_json;
-    struct json_object *latest_reading_object = json_object_new_object();
-    struct json_object *temperature_object = json_object_new_object();
-    struct json_object *pressure_object = json_object_new_object();
+    double celsius = sensor_readings_data->temperature;
+    double fahrenheit = celsius_to_fahrenheit(sensor_readings_data->temperature);
+    double pascals = sensor_readings_data->pressure;
+    double millibars = pascals_to_mbar(sensor_readings_data->pressure);
+    double humidity = sensor_readings_data->humidity;
 
     timeinfo = localtime(&rawtime);
     strftime(dateString, 32, "%F", timeinfo);
-    strftime(timeString, 32, "%F_%H-%M-%S", timeinfo);
+    strftime(datetimeString, 32, "%F %H:%M:%S", timeinfo);
 
-    snprintf(filename, sizeof(filename), "readings_%s.json", dateString);
+    snprintf(filename, sizeof(filename), "/home/pi/readings/readings_%s.csv", dateString);
 
     if (!check_file_exists(filename))
     {
         printf("File for today does not exist! Creating... \n");
-        FILE *jsonFile = fopen(filename, "w");
-        fputs("{}", jsonFile);
-        fclose(jsonFile);
+        FILE *csvFile = fopen(filename, "w");
+        fputs("Date,Celsius,Fahrenheit,Pascals,Millibars,Humidity Percent\n", csvFile);
+        fclose(csvFile);
     }
 
-    jsonFilePtr = fopen(filename, "r");
-    if (jsonFilePtr == NULL)
-    {
-        printf("Failed to open %s for reading...\n", filename);
-        exit(1);
-    }
-    jsonBuffer = parse_json_contents(jsonFilePtr, 10); // 10 as initial size
-    //fread(jsonBuffer, 1024, 1, jsonFilePtr);
-    fclose(jsonFilePtr);
-
-    parsed_json = json_tokener_parse(jsonBuffer);
-
-    fahrenheit = celsius_to_fahrenheit(sensor_readings_data->temperature);
-    celsius = sensor_readings_data->temperature;
-    pascals = sensor_readings_data->pressure;
-    millibars = pascals_to_mbar(sensor_readings_data->pressure);
-    humidity = sensor_readings_data->humidity;
-
-    json_object_object_add(temperature_object, "celsius", json_object_new_double(sensor_readings_data->temperature));
-    json_object_object_add(temperature_object, "fahrenheit", json_object_new_double(fahrenheit));
-    json_object_object_add(pressure_object, "pascals", json_object_new_double(sensor_readings_data->pressure));
-    json_object_object_add(pressure_object, "millibars", json_object_new_double(millibars));
-
-    json_object_object_add(latest_reading_object, "temperature", temperature_object);
-    json_object_object_add(latest_reading_object, "pressure", pressure_object);
-    json_object_object_add(latest_reading_object, "humidity_percent", json_object_new_double(humidity));
-
-    json_object_object_add(parsed_json, timeString, latest_reading_object);
-
-    jsonFilePtr = fopen(filename, "w");
-    if (jsonFilePtr == NULL)
+    csvFilePtr = fopen(filename, "a");
+    if (csvFilePtr == NULL)
     {
         printf("Failed to open %s for writing...\n", filename);
         exit(1);
     }
-    fputs(json_object_to_json_string_ext(parsed_json, JSON_C_TO_STRING_PRETTY), jsonFilePtr);
-    fclose(jsonFilePtr);
+    fprintf(csvFilePtr, "%s,%0.5f,%0.5f,%0.5f,%0.5f,%0.5f\n", datetimeString, celsius, fahrenheit, pascals, millibars, humidity);
+    fclose(csvFilePtr);
+    
     return 0;
 }
 
@@ -209,7 +175,7 @@ int8_t read_sensor_data_normal_mode(struct bme280_dev *dev)
     readings_result = bme280_set_sensor_mode(BME280_NORMAL_MODE, dev);
     readings_result = bme280_get_sensor_data(BME280_ALL, &sensor_readings_data, dev);
     //print_sensor_data(&sensor_readings_data);
-    save_data_to_json_file(&sensor_readings_data);
+    save_data_to_csv_file(&sensor_readings_data);
 
     return readings_result;
 }
@@ -236,9 +202,11 @@ int main(int argc, char* argv[])
     dev.delay_ms = user_delay_ms;
 
     init_result = bme280_init(&dev);
-    printf("\r\n BME280 Init Result is:%d \r\n", init_result);
+    printf("\n\nBME280 Init Result is: %d\n\n", init_result);
 
     read_sensor_data_normal_mode(&dev);
     
+    printf("Recorded readings.\n\n");
+
     return 0;
 }