pridany zdrojak pre arduino a AGENTS.md

arduino/arduino.ino

@@ -0,0 +1,245 @@
+#if defined(ESP8266)
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+#include <WiFiClientSecureBearSSL.h>
+#elif defined(ESP32)
+#include <WiFi.h>
+#include <HTTPClient.h>
+#include <WiFiClientSecure.h>
+#include <esp_sleep.h>
+#else
+#error "This sketch supports ESP8266 and ESP32 boards only."
+#endif
+
+const int PIN_COMMON_ELECTRODE = 13;  // GPIO13 / D7
+const int PIN_LEVEL1 = 5;             // GPIO5  / D1 - najnizsia hladina
+const int PIN_LEVEL2 = 4;             // GPIO4  / D2
+const int PIN_LEVEL3 = 14;            // GPIO14 / D5
+const int PIN_LEVEL4 = 12;            // GPIO12 / D6 - najvyssia hladina
+
+const int DEBUG = 1;
+
+const char WIFI_SSID[] = "TP-Link_DD1E";
+const char WIFI_PASS[] = "33784120";
+const unsigned long SLEEP_TIME_SEC = 1800;
+const char URL_LOG[] = "https://vihorlat.tpsoft.org/hladinac/server/log.php";
+
+const unsigned long WIFI_TIMEOUT_MS = 15000;
+const unsigned long MEASUREMENT_STABILIZE_MS = 50;
+
+struct WaterLevels {
+  int level1;
+  int level2;
+  int level3;
+  int level4;
+};
+
+void initPins();
+WaterLevels readLevels();
+void printLevels(const WaterLevels &levels);
+String buildPostBody(const WaterLevels &levels);
+bool connectWifi();
+bool sendLevelsToServer(const WaterLevels &levels);
+void enterDeepSleep();
+void setupLevelPin(int pin);
+void setCommonElectrodeOn();
+void setCommonElectrodeOff();
+int readLevelPin(int pin);
+
+void setup() {
+  Serial.begin(115200);
+  delay(200);
+  Serial.println("Hladinac v0.3 started.");
+
+  initPins();
+
+  if (DEBUG == 0) {
+    WaterLevels levels = readLevels();
+    printLevels(levels);
+
+    if (connectWifi()) {
+      sendLevelsToServer(levels);
+      WiFi.disconnect(true);
+      WiFi.mode(WIFI_OFF);
+    } else {
+      Serial.println("WiFi connection failed, skipping upload.");
+    }
+
+    enterDeepSleep();
+  } else if (DEBUG == 2) {
+    connectWifi();
+  }
+}
+
+void loop() {
+  if (DEBUG == 1) {
+    WaterLevels levels = readLevels();
+    printLevels(levels);
+    delay(1000);
+  } else if (DEBUG == 2) {
+    WaterLevels levels = readLevels();
+    printLevels(levels);
+
+    if (WiFi.status() != WL_CONNECTED) {
+      connectWifi();
+    }
+
+    sendLevelsToServer(levels);
+    delay(5000);
+  }
+}
+
+void initPins() {
+  pinMode(PIN_COMMON_ELECTRODE, OUTPUT);
+  setCommonElectrodeOff();
+
+  setupLevelPin(PIN_LEVEL1);
+  setupLevelPin(PIN_LEVEL2);
+  setupLevelPin(PIN_LEVEL3);
+  setupLevelPin(PIN_LEVEL4);
+}
+
+void setupLevelPin(int pin) {
+#if defined(ESP32)
+  pinMode(pin, INPUT_PULLDOWN);
+#else
+  // ESP8266 pouziva externe pull-down rezistory na GND.
+  pinMode(pin, INPUT);
+#endif
+}
+
+void setCommonElectrodeOn() {
+#if defined(ESP8266)
+  digitalWrite(PIN_COMMON_ELECTRODE, HIGH);
+#else
+  digitalWrite(PIN_COMMON_ELECTRODE, HIGH);
+#endif
+}
+
+void setCommonElectrodeOff() {
+#if defined(ESP8266)
+  digitalWrite(PIN_COMMON_ELECTRODE, LOW);
+#else
+  digitalWrite(PIN_COMMON_ELECTRODE, LOW);
+#endif
+}
+
+int readLevelPin(int pin) {
+#if defined(ESP8266)
+  return digitalRead(pin) == HIGH ? 1 : 0;
+#else
+  return digitalRead(pin) == HIGH ? 1 : 0;
+#endif
+}
+
+WaterLevels readLevels() {
+  WaterLevels levels;
+
+  // Spolocna elektroda je zapnuta iba pocas merania, aby sa znizila korozia.
+  setCommonElectrodeOn();
+  delay(MEASUREMENT_STABILIZE_MS);
+
+  levels.level1 = readLevelPin(PIN_LEVEL1);
+  levels.level2 = readLevelPin(PIN_LEVEL2);
+  levels.level3 = readLevelPin(PIN_LEVEL3);
+  levels.level4 = readLevelPin(PIN_LEVEL4);
+
+  setCommonElectrodeOff();
+
+  return levels;
+}
+
+void printLevels(const WaterLevels &levels) {
+  Serial.print("level1=");
+  Serial.print(levels.level1);
+  Serial.print(" level2=");
+  Serial.print(levels.level2);
+  Serial.print(" level3=");
+  Serial.print(levels.level3);
+  Serial.print(" level4=");
+  Serial.println(levels.level4);
+}
+
+String buildPostBody(const WaterLevels &levels) {
+  String body = "level1=" + String(levels.level1);
+  body += "&level2=" + String(levels.level2);
+  body += "&level3=" + String(levels.level3);
+  body += "&level4=" + String(levels.level4);
+  return body;
+}
+
+bool connectWifi() {
+  if (WiFi.status() == WL_CONNECTED) {
+    return true;
+  }
+
+  Serial.print("Connecting to WiFi");
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(WIFI_SSID, WIFI_PASS);
+
+  unsigned long startedAt = millis();
+  while (WiFi.status() != WL_CONNECTED && millis() - startedAt < WIFI_TIMEOUT_MS) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  if (WiFi.status() == WL_CONNECTED) {
+    Serial.println();
+    Serial.print("WiFi connected, IP=");
+    Serial.println(WiFi.localIP());
+    return true;
+  }
+
+  Serial.println();
+  Serial.println("WiFi connection timeout.");
+  return false;
+}
+
+bool sendLevelsToServer(const WaterLevels &levels) {
+  if (WiFi.status() != WL_CONNECTED) {
+    Serial.println("Cannot send data, WiFi is not connected.");
+    return false;
+  }
+
+#if defined(ESP8266)
+  BearSSL::WiFiClientSecure client;
+#else
+  WiFiClientSecure client;
+#endif
+  client.setInsecure();
+
+  HTTPClient http;
+  if (!http.begin(client, URL_LOG)) {
+    Serial.println("HTTP begin failed.");
+    return false;
+  }
+
+  String body = buildPostBody(levels);
+  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
+
+  int httpCode = http.POST(body);
+  if (httpCode > 0) {
+    Serial.print("POST sent, HTTP code=");
+    Serial.println(httpCode);
+  } else {
+    Serial.print("POST failed: ");
+    Serial.println(http.errorToString(httpCode));
+  }
+
+  http.end();
+  return httpCode > 0 && httpCode < 400;
+}
+
+void enterDeepSleep() {
+  Serial.print("Entering deep sleep for ");
+  Serial.print(SLEEP_TIME_SEC);
+  Serial.println(" seconds.");
+  Serial.flush();
+
+#if defined(ESP8266)
+  ESP.deepSleep((uint64_t)SLEEP_TIME_SEC * 1000000ULL);
+#else
+  esp_sleep_enable_timer_wakeup((uint64_t)SLEEP_TIME_SEC * 1000000ULL);
+  esp_deep_sleep_start();
+#endif
+}