Ignore spurrious clang arguments

.gitignore

@@ -1,2 +1 @@
 .pio
-data/config.json

README.org

@@ -1,44 +1,13 @@
 * Homeostasis
 
-Temperature, air humidity and soil humidity sensor that communicates via MQTT. The project is implemented using a Wemos D1 mini board with the following components:
+Temperature, air humidity and soil humidity sensor that communicates via MQTT. The project is implemented using a Wemos D1 mini board with the following addons:
 
-- DHT22 temperature and humidity sensor
+- DHT11 temperature and humidity
 - FC-28 soil hygrometer sensor
 - Battery shield
 - 3.7V 1000mAh Lithium battery
 
-The sensor captures the data every 15 minutes and sends it to a MQTT broker and then enters deep sleep, it is important to save power as the device runs off a battery.
-
-#+ATTR_HTML: :width 60%
-[[./result.png]]
-
 ** Pinout of the board
 
-#+ATTR_HTML: :width 40%
+#+ATTR_HTML: :width 50%
 [[./pinout.png]]
-** Dependencies
-- [[https://github.com/adafruit/DHT-sensor-library][Adafruit DHT sensor library]]
-- [[https://github.com/adafruit/Adafruit_Sensor][Adafruit Unified Sensor Driver]]
-- [[https://github.com/knolleary/pubsubclient][PubSubClient]]
-- [[https://github.com/bblanchon/ArduinoJson][ArduinoJSON]]
-** Deployment
-
-The software uses the Arduino framework and the development environment of [[https://platformio.org/][PlatformIO]], which offers better tools than the Arduino IDE.
-
-1. Upload the configuration file to the board:
-
-#+begin_src shell
-pio run -t uploadfs
-#+end_src
-
-2. Compile the project
-
-#+begin_src shell
-pio run -t compile
-#+end_src
-
-3. Upload firmware
-
-#+begin_src shell
-pio run -t upload
-#+end_src

data/example.json

@@ -1,12 +0,0 @@
-{
-  "ssid": "",
-  "psk": "",
-  "mqtt_host": "",
-  "mqtt_user": "",
-  "mqtt_password": "",
-  "mqtt_port": 1883,
-  "mqtt_topic": "",
-  "device_id": "",
-  "sleep_time": 30,
-  "connection_attempts": 60
-}

include/config.h

@@ -1,27 +0,0 @@
-#ifndef CONFIG_H_
-#define CONFIG_H_
-
-#include "FS.h"
-#include "LittleFS.h"
-#include <ArduinoJson.h>
-
-typedef struct {
-  const char *ssid;
-  const char *psk;
-  const char *mqtt_host;
-  const char *mqtt_user;
-  const char *mqtt_password;
-  const char *topic;
-  const char *device_id;
-  int mqtt_port;
-  long sleep_time;
-  int connection_attempts;
-} Config;
-
-void initialize_config(Config *config, StaticJsonDocument<512> json);
-
-bool load_config_file(const char *file_path, Config *config);
-
-long minutes_to_microseconds(int minutes);
-
-#endif // CONFIG_H_

include/wlan.h

@@ -1,16 +0,0 @@
-#ifndef WLAN_H
-#define WLAN_H
-
-#include "config.h"
-#include <ESP8266WiFi.h>
-#include <PubSubClient.h>
-
-void initial_connection(const char *ssid, const char *psk);
-void connect_wlan(Config *config);
-void connect_mqtt(PubSubClient &client, Config *config);
-void disconnect_mqtt(PubSubClient &client, const char *topic);
-size_t construct_json(float *data, char *buffer, int buffer_size);
-void mqtt_transfer(PubSubClient &client, Config *config, float *data);
-void enter_deep_sleep(bool wifi_timeout, int sleep_time);
-
-#endif /* WLAN_H */

platformio.ini

@@ -11,10 +11,7 @@
 [env:d1_mini]
 platform = espressif8266
 board = d1_mini
-board_build.filesystem = littlefs
 framework = arduino
 lib_deps =
   adafruit/DHT sensor library@^1.4.4
   adafruit/Adafruit Unified Sensor@^1.1.9
-  knolleary/PubSubClient@^2.8
-  bblanchon/ArduinoJson@^6.21.1

src/config.cpp

@@ -1,30 +0,0 @@
-#include "config.h"
-
-void initialize_config(Config *config, StaticJsonDocument<512> json) {
-  config->ssid = strdup(json["ssid"]);
-  config->psk = strdup(json["psk"]);
-  config->mqtt_host = strdup(json["mqtt_host"]);
-  config->mqtt_user = strdup(json["mqtt_user"]);
-  config->mqtt_password = strdup(json["mqtt_password"]);
-  config->topic = strdup(json["mqtt_topic"]);
-  config->device_id = strdup(json["device_id"]);
-  config->mqtt_port = json["mqtt_port"];
-  config->sleep_time = minutes_to_microseconds(json["sleep_time"]);
-  config->connection_attempts = json["connection_attempts"];
-}
-
-bool load_config_file(const char *file_path, Config *config) {
-  if (!LittleFS.begin())
-    return false;
-  File config_file = LittleFS.open(file_path, "r");
-  if (!config_file)
-    return false;
-  StaticJsonDocument<512> json;
-  DeserializationError err = deserializeJson(json, config_file);
-  if (err)
-    return false;
-  initialize_config(config, json);
-  return true;
-}
-
-long minutes_to_microseconds(int minutes) { return (minutes * 6e7); }

src/main.cpp

@@ -1,41 +1,25 @@
-#include "config.h"
-#include "wlan.h"
 #include <Arduino.h>
 #include <DHT.h>
 
-#define DHTTYPE DHT22
+#define DHTTYPE DHT11
 #define DHTPIN 4
+
 DHT dht(DHTPIN, DHTTYPE);
 
-const int fc28_pin = A0;
+int fc28_pin = A0;
-const char *config_file_path = "/config.json";
+int soil_threshold = 40;
-Config *config;
-WiFiClient wifi_client;
-PubSubClient mqtt_client(wifi_client);
-
-bool check_valid_value(float value) {
-  return (!isnan(value) && value >= 0 && value <= 100);
-}
 
 void setup() {
   Serial.begin(9600);
   dht.begin();
-  config = (Config *)malloc(sizeof(Config));
-  if (!load_config_file(config_file_path, config))
-    Serial.println("ERROR: The config file could not be loaded");
-  connect_wlan(config);
 }
 
 void loop() {
-  float temperature = dht.readTemperature();
+  char buffer[200];
-  float humidity = dht.readHumidity();
   int analog_val = analogRead(fc28_pin);
   int soil_percentage = map(analog_val, 0, 1023, 0, 100);
-  float data[3] = {temperature, humidity, static_cast<float>(soil_percentage)};
+  sprintf(buffer, "Temperature: %.2f°C Humidity: %.2f%% Soil humidity: %i%%",
-  if (check_valid_value(temperature) && check_valid_value(humidity)) {
+          dht.readTemperature(), dht.readHumidity(), soil_percentage);
-    mqtt_transfer(mqtt_client, config, data);
+  Serial.println(buffer);
-  }
+  delay(30000);
-  disconnect_mqtt(mqtt_client, config->topic);
-  free(config);
-  enter_deep_sleep(false, config->sleep_time);
 }

src/wlan.cpp

@@ -1,63 +0,0 @@
-#include "wlan.h"
-#include <ArduinoJson.h>
-
-void initial_connection(const char *ssid, const char *psk) {
-  WiFi.begin(ssid, psk);
-  WiFi.persistent(true);
-  WiFi.setAutoConnect(true);
-  WiFi.setAutoReconnect(true);
-}
-
-void connect_wlan(Config *config) {
-  if (WiFi.SSID() != config->ssid)
-    initial_connection(config->ssid, config->psk);
-  int retries = 0;
-  while (WiFi.status() != WL_CONNECTED) {
-    if (retries == config->connection_attempts)
-      enter_deep_sleep(true, config->sleep_time);
-    retries++;
-    delay(1000);
-    Serial.print(".");
-  }
-  Serial.println("WiFi connected");
-}
-
-void connect_mqtt(PubSubClient &client, Config *config) {
-  if (!client.connected())
-    client.setServer(config->mqtt_host, config->mqtt_port);
-  if (client.connect(config->device_id, config->mqtt_user,
-                     config->mqtt_password)) {
-    Serial.println("MQTT connected");
-    client.subscribe(config->topic);
-  }
-}
-
-void disconnect_mqtt(PubSubClient &client, const char *topic) {
-  Serial.println("Disconnecting MQTT");
-  client.unsubscribe(topic);
-  client.disconnect();
-}
-
-size_t construct_json(float *data, char *buffer, int buffer_size) {
-  StaticJsonDocument<100> json;
-  json["temperature"] = data[0];
-  json["humidity"] = data[1];
-  json["soil_humidity"] = data[2];
-  size_t payload_size = serializeJson(json, buffer, buffer_size);
-  return payload_size;
-}
-
-void mqtt_transfer(PubSubClient &client, Config *config, float *data) {
-  char buffer[100];
-  connect_mqtt(client, config);
-  size_t payload_size = construct_json(data, buffer, 100);
-  client.publish(config->topic, buffer, payload_size);
-  Serial.println("Data transferred successfully");
-}
-
-void enter_deep_sleep(bool wifi_timeout, int sleep_time) {
-  Serial.println("Entering deep sleep");
-  if (wifi_timeout)
-    WiFi.disconnect();
-  ESP.deepSleep(sleep_time, WAKE_RF_DEFAULT);
-}