homeostasis/src/main.cpp

#include "wlan.h"
#include <Arduino.h>
#include <DHT.h>

#define DHTTYPE DHT11
#define DHTPIN 4
DHT dht(DHTPIN, DHTTYPE);

const int fc28_pin = A0;
// TODO Tweak threshold to get good value
const int soil_threshold = 40;
const int num_topics = 3;
const int max_connection_attempts = 60;
const char *topics[] = {"homeostasis/temperature", "homeostasis/humidity",
                        "homeostasis/soil_humidity"};
const char *device_id = "homeostasis";
WiFiClient wlan_client;
PubSubClient mqtt_client(wlan_client);

bool check_valid_value(float value) {
  return (!isnan(value) && value >= 0 && value <= 100);
}

void setup() {
  Serial.begin(9600);
  dht.begin();
  connect_wlan(max_connection_attempts);
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int analog_val = analogRead(fc28_pin);
  int soil_percentage = map(analog_val, 0, 1023, 0, 100);
  float data[] = {temperature, humidity, static_cast<float>(soil_percentage)};
  if (check_valid_value(temperature) && check_valid_value(humidity)) {
    mqtt_transfer(mqtt_client, device_id, topics, data, num_topics);
  }
  disconnect_mqtt(mqtt_client, topics, num_topics);
  enter_deep_sleep(false);
}