Connected Tree Health Monitor

#include <WiFi.h>
#include <WebServer.h>
#include <Preferences.h>
#include <HTTPClient.h>
#include <Wire.h>
#include <Adafruit_BME280.h>
#include <Adafruit_seesaw.h>
#include <BH1750.h>

#define I2C_SDA_PIN 21
#define I2C_SCL_PIN 22

const char *AP_NAME = "SaudeArvore-Setup";
const char *AP_PASSWORD = "Arvore2026";
const unsigned long READ_INTERVAL_MS = 10000UL;
const unsigned long UPLOAD_INTERVAL_MS = 900000UL;

WebServer server(80);
Preferences preferences;
Adafruit_BME280 bme;
Adafruit_seesaw soil;
BH1750 luxMeter;

bool bmeReady = false;
bool soilReady = false;
bool lightReady = false;
float airTemperature = NAN;
float airHumidity = NAN;
float airPressure = NAN;
float lightLux = NAN;
uint16_t soilRaw = 0;
unsigned long lastReadMs = 0;
unsigned long lastUploadMs = 0;

String htmlEscape(const String &text) {
  String out;
  for (size_t i = 0; i < text.length(); i++) {
    char c = text[i];
    if (c == '&') out += "&amp;";
    else if (c == '<') out += "&lt;";
    else if (c == '>') out += "&gt;";
    else if (c == '\"') out += "&quot;";
    else out += c;
  }
  return out;
}

String numberOrDash(float value, uint8_t decimals) {
  return isnan(value) ? "--" : String(value, static_cast<unsigned int>(decimals));
}

String conditionText() {
  if (!soilReady || soilRaw == 0) return "Sensor de solo indisponivel";
  if (soilRaw < 350) return "Solo provavelmente muito seco";
  if (soilRaw > 900) return "Solo provavelmente muito umido";
  return "Umidade do solo em faixa intermediaria";
}

void readSensors() {
  if (bmeReady) {
    airTemperature = bme.readTemperature();
    airHumidity = bme.readHumidity();
    airPressure = bme.readPressure() / 100.0F;
  }
  if (soilReady) soilRaw = soil.touchRead(0);
  if (lightReady) lightLux = luxMeter.readLightLevel();
  Serial.printf("Solo:%u Temp:%.1fC Umidade:%.1f%% Pressao:%.1fhPa Luz:%.1flux\n", soilRaw, airTemperature, airHumidity, airPressure, lightLux);
}

String jsonPayload() {
  String body = "{";
  body += "\"soil_raw\":" + String(soilRaw) + ",";
  body += "\"air_temperature_c\":" + numberOrDash(airTemperature, 2) + ",";
  body += "\"air_humidity_percent\":" + numberOrDash(airHumidity, 2) + ",";
  body += "\"air_pressure_hpa\":" + numberOrDash(airPressure, 2) + ",";
  body += "\"light_lux\":" + numberOrDash(lightLux, 1);
  body += "}";
  return body;
}

void uploadIfConfigured() {
  String endpoint = preferences.getString("endpoint", "");
  if (WiFi.status() != WL_CONNECTED || endpoint.length() == 0) return;
  HTTPClient http;
  http.setTimeout(8000);
  http.begin(endpoint);
  http.addHeader("Content-Type", "application/json");
  int status = http.POST(jsonPayload());
  Serial.printf("Envio HTTP: %d\n", status);
  http.end();
}

void handleRoot() {
  String ssid = preferences.getString("ssid", "");
  String endpoint = preferences.getString("endpoint", "");
  String page = "<!doctype html><html><head><meta charset='utf-8'><meta name='viewport' content='width=device-width,initial-scale=1'>";
  page += "<style>body{font-family:Arial;max-width:680px;margin:24px auto;padding:0 16px;color:#173b22}h1{color:#27713a}.card{background:#eef8ef;padding:14px;margin:10px 0;border-radius:8px}input{width:100%;padding:9px;margin:5px 0 12px;box-sizing:border-box}button{padding:10px;background:#27713a;color:white;border:0;border-radius:5px}</style></head><body>";
  page += "<h1>Monitor da arvore</h1><div class='card'><b>Leitura atual</b><br>Solo (valor bruto): " + String(soilRaw) + "<br>Temperatura: " + numberOrDash(airTemperature, 1) + " C<br>Umidade do ar: " + numberOrDash(airHumidity, 1) + " %<br>Pressao: " + numberOrDash(airPressure, 1) + " hPa<br>Luz: " + numberOrDash(lightLux, 1) + " lux<br><b>Interpretacao:</b> " + conditionText() + "</div>";
  page += "<div class='card'><b>Configuracao de rede e envio</b><p>Deixe o endereco de envio vazio para usar somente esta pagina local.</p><form method='post' action='/save'>";
  page += "Nome da rede Wi-Fi<input name='ssid' value='" + htmlEscape(ssid) + "'>Senha Wi-Fi<input type='password' name='pass' placeholder='digite para alterar'>";
  page += "Endereco para receber JSON (HTTP/HTTPS)<input name='endpoint' value='" + htmlEscape(endpoint) + "' placeholder='https://seu-servidor/exemplo'>";
  page += "<button type='submit'>Salvar e reiniciar</button></form></div></body></html>";
  server.send(200, "text/html; charset=utf-8", page);
}

void handleSave() {
  if (server.hasArg("ssid")) preferences.putString("ssid", server.arg("ssid"));
  if (server.hasArg("pass") && server.arg("pass").length() > 0) preferences.putString("pass", server.arg("pass"));
  if (server.hasArg("endpoint")) preferences.putString("endpoint", server.arg("endpoint"));
  server.send(200, "text/html; charset=utf-8", "<p>Configuracao salva. O monitor vai reiniciar.</p>");
  delay(1000);
  ESP.restart();
}

void startNetwork() {
  String ssid = preferences.getString("ssid", "");
  String pass = preferences.getString("pass", "");
  if (ssid.length() > 0) {
    WiFi.mode(WIFI_STA);
    WiFi.begin(ssid.c_str(), pass.c_str());
    unsigned long started = millis();
    while (WiFi.status() != WL_CONNECTED && millis() - started < 20000UL) delay(250);
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.print("Conectado em: http://");
    Serial.println(WiFi.localIP());
  } else {
    WiFi.mode(WIFI_AP);
    WiFi.softAP(AP_NAME, AP_PASSWORD);
    Serial.print("Modo de configuracao: http://");
    Serial.println(WiFi.softAPIP());
  }
}

void setup() {
  Serial.begin(115200);
  preferences.begin("tree-monitor", false);
  Wire.begin(I2C_SDA_PIN, I2C_SCL_PIN);
  bmeReady = bme.begin(0x76);
  soilReady = soil.begin(0x36);
  lightReady = luxMeter.begin(BH1750::CONTINUOUS_HIGH_RES_MODE, 0x23, &Wire);
  startNetwork();
  server.on("/", HTTP_GET, handleRoot);
  server.on("/save", HTTP_POST, handleSave);
  server.begin();
  readSensors();
}

void loop() {
  server.handleClient();
  unsigned long now = millis();
  if (now - lastReadMs >= READ_INTERVAL_MS) {
    lastReadMs = now;
    readSensors();
  }
  if (now - lastUploadMs >= UPLOAD_INTERVAL_MS) {
    lastUploadMs = now;
    uploadIfConfigured();
  }
  delay(10);
}