Initial working Telegram bot, LDR and LED

.gitignore

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+ESP8266/secrets.h 

Arduino/Arduino.ino

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+#define LEDPIN 8
+
+String incomingString;
+
+void setup() {
+  pinMode(LEDPIN, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  if (Serial.available() > 0) {
+    char cmd = Serial.read();
+    if (cmd == 'O') {
+      digitalWrite(LEDPIN, HIGH);  // Open
+    } else if (cmd == 'C') {
+      digitalWrite(LEDPIN, LOW);   // Close
+    } else if (cmd == 'R') {
+      int ldrValue = analogRead(A0);
+      Serial.println(ldrValue);
+    }
+  }
+  delay(50);
+}

Arduino/LDRtest/LDRtest.ino

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+/* LDR test measuring with A0 in middle of 10k Ohm resistor and LDR
+ * +5V ---[ LDR ]---+---[ Resistor ]--- GND
+                 |
+              Analog A0
+*/ 
+
+void setup() {
+  Serial.begin(9600);
+}
+
+void loop() {
+  int value = analogRead(A0);  // Reads value between 0 and 1023
+  Serial.println(value);
+  delay(500);
+}
+

ESP8266/ESP8266.ino

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+#include <ESP8266WiFi.h>
+#include <WiFiClientSecure.h>
+#include <ESP8266HTTPClient.h>
+#include <ArduinoJson.h>
+#include "secrets.h"
+
+// --- WiFi & Telegram Config ---
+const char* ssid = WIFI_SSID;
+const char* password = WIFI_PASS;
+const char* botToken = TELEGRAM_BOT_TOKEN;
+const char* chatID = TELEGRAM_CHAT_ID;
+
+WiFiClientSecure telegramClient;
+
+// --- Timing ---
+long lastUpdateId = 0;
+unsigned long lastTelegramCheck = 0;
+const unsigned long telegramCheckInterval = 10000;  // 10 seconds
+unsigned long lastLDRSend = 0;
+const unsigned long ldrSendInterval = 5UL * 60UL * 1000UL; // 5 minutes
+
+// --- Utility: URL Encode ---
+String urlencode(const String& str) {
+  String encoded = "";
+  char c;
+  char code0, code1;
+  for (unsigned int i = 0; i < str.length(); i++) {
+    c = str.charAt(i);
+    if (isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~') {
+      encoded += c;
+    } else {
+      code1 = (c & 0xf) + '0';
+      if ((c & 0xf) > 9) code1 = (c & 0xf) - 10 + 'A';
+      c = (c >> 4) & 0xf;
+      code0 = c + '0';
+      if (c > 9) code0 = c - 10 + 'A';
+      encoded += '%';
+      encoded += code0;
+      encoded += code1;
+    }
+  }
+  return encoded;
+}
+
+// --- Telegram Messaging ---
+void sendTelegramMessage(String message) {
+  if (WiFi.status() != WL_CONNECTED) return;
+  HTTPClient http;
+  String url = "https://api.telegram.org/bot" + String(botToken) +
+               "/sendMessage?chat_id=" + String(chatID) +
+               "&text=" + urlencode(message);
+  http.begin(telegramClient, url);
+  int httpCode = http.GET();
+  http.end();
+}
+
+// --- LDR Handling ---
+void sendLDRToTelegram() {
+  Serial.write('R');
+  unsigned long start = millis();
+  String ldrValue = "";
+  while (millis() - start < 2000) { // wait up to 2 seconds
+    if (Serial.available()) {
+      ldrValue = Serial.readStringUntil('\n');
+      ldrValue.trim();
+      break;
+    }
+  }
+  if (ldrValue.length() > 0) {
+    sendTelegramMessage("Current LDR value: " + ldrValue);
+  } else {
+    sendTelegramMessage("Failed to read LDR value from Arduino.");
+  }
+}
+
+// --- Telegram Command Handling ---
+void checkTelegramCommands() {
+  HTTPClient http;
+  String url = "https://api.telegram.org/bot" + String(botToken) +
+               "/getUpdates?offset=" + String(lastUpdateId + 1);
+  http.begin(telegramClient, url);
+  int httpCode = http.GET();
+  if (httpCode == HTTP_CODE_OK) {
+    String payload = http.getString();
+    DynamicJsonDocument doc(2048);
+    DeserializationError error = deserializeJson(doc, payload);
+    if (error) {
+      http.end();
+      return;
+    }
+    JsonArray results = doc["result"].as<JsonArray>();
+    for (JsonObject msg : results) {
+      lastUpdateId = msg["update_id"];
+      long fromId = msg["message"]["from"]["id"];
+      String text = msg["message"]["text"];
+      if (String(fromId) != chatID) {
+        continue;
+      }
+      if (text == "/open_chickencoop") {
+        Serial.write('O');
+        sendTelegramMessage("Opening chicken coop.");
+      } else if (text == "/close_chickencoop") {
+        Serial.write('C');
+        sendTelegramMessage("Closing chicken coop.");
+      } else if (text == "/ldr") {
+        sendLDRToTelegram();
+      } else {
+        sendTelegramMessage("Unknown command.");
+      }
+    }
+  }
+  http.end();
+}
+
+// --- Sync lastUpdateId on startup ---
+void syncLastUpdateId() {
+  HTTPClient http;
+  String url = "https://api.telegram.org/bot" + String(botToken) + "/getUpdates";
+  http.begin(telegramClient, url);
+  int httpCode = http.GET();
+  if (httpCode == HTTP_CODE_OK) {
+    String payload = http.getString();
+    DynamicJsonDocument doc(4096);
+    DeserializationError error = deserializeJson(doc, payload);
+    if (!error) {
+      JsonArray results = doc["result"].as<JsonArray>();
+      for (JsonObject msg : results) {
+        long updateId = msg["update_id"];
+        if (updateId > lastUpdateId) lastUpdateId = updateId;
+      }
+    }
+  }
+  http.end();
+}
+
+// --- Setup ---
+void setup() {
+  Serial.begin(9600);
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+  }
+  telegramClient.setInsecure();
+  syncLastUpdateId();
+  sendTelegramMessage("ESP8266 connected. IP: " + WiFi.localIP().toString());
+}
+
+// --- Main Loop ---
+void loop() {
+  unsigned long now = millis();
+  if (now - lastTelegramCheck >= telegramCheckInterval) {
+    lastTelegramCheck = now;
+    checkTelegramCommands();
+  }
+  if (now - lastLDRSend >= ldrSendInterval) {
+    lastLDRSend = now;
+    sendLDRToTelegram();
+  }
+}

ESP8266/secrets_template.h

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+#pragma once
+
+#define WIFI_SSID     "your_wifi_ssid"
+#define WIFI_PASS     "your_wifi_password"
+#define TELEGRAM_BOT_TOKEN "your_bot_token"
+#define TELEGRAM_CHAT_ID   "your_chat_id" 

README.md

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+# Automatic chicken coop door opener and closer with Telegram notifier
+
+## Setup Secrets
+
+1. Copy `ESP8266/secrets_template.h` to `ESP8266/secrets.h`:
+   ```sh
+   cp ESP8266/secrets_template.h ESP8266/secrets.h
+   ```
+2. Edit `ESP8266/secrets.h` and fill in your WiFi and Telegram bot credentials.
+
+**Do not commit `secrets.h` to version control.** 
+
+### Bdnugget 2025