![\"ESP8266](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/ESP8266-Door-status-monitor-Telegram-thumbnail.jpg?resize=1200%2C675&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nWe have a similar tutorial that sends emails instead of Telegram messages:<\/p>\n\n\n\n
- ESP8266 NodeMCU Door Status Monitor with Email Notifications (IFTTT)<\/a><\/li><\/ul>\n\n\n\n
Read the ESP32 Guide: Door Status Monitor with Telegram Notifications<\/a><\/p>\n\n\n\n
Project Overview<\/h2>\n\n\n\n
In this project, we’ll create a Telegram Bot that will send messages to your Telegram account whenever a door changes state. To detect the change, we’ll use a magnetic contact switch. <\/p>\n\n\n\n
A magnetic contact switch is basically a reed switch encased in a plastic shell so that you can easily apply it to a door, a window, or a drawer to detect if it is open or closed.<\/p>\n\n\n\n
![\"magnetic](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/reed-switch-door-status-monitor-sensor.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nThe electrical circuit is closed when a magnet is near the switch\u2014door closed. When the magnet is far away from the switch\u2014door open\u2014the circuit is open. See the figure below.<\/p>\n\n\n\n
![\"magnetic](\"https:\/\/i2.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2016\/02\/magnetic_reed_switch_howitworks.png?resize=665%2C374&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nWe can connect the reed switch to an ESP8266 GPIO to detect changes in its state.<\/p>\n\n\n\n
Introducing Telegram<\/h2>\n\n\n\n
Telegram<\/a> Messenger is a cloud-based instant messaging and voice over IP service. You can easily install it on your smartphone (Android and iPhone) or computer (PC, Mac, and Linux). It is free and without any ads. Telegram allows you to create bots that you can interact with.<\/p>\n\n\n\n
![\"Telegram](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/telegram-logo.png?resize=150%2C150&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n“Bots are third-party applications that run inside Telegram. Users can interact with bots by sending them messages, commands, and inline requests. You control your bots using HTTPS requests to Telegram Bot API<\/em>“.<\/p>\n\n\n\n
The ESP8266 will interact with the Telegram bot to send messages to your Telegram account. Whenever the door changes state, you’ll receive a notification on your smartphone (as long as you have access to the internet).<\/p>\n\n\n\n
Creating a Telegram Bot<\/h2>\n\n\n\n
Go to Google Play or App Store, download, and install Telegram<\/strong>.<\/p>\n\n\n\n
![\"Install](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/Install-Telegram.png?resize=354%2C269&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nOpen Telegram and follow the next steps to create a Telegram Bot. First, search for “botfather<\/strong>” and click the BotFather as shown below. Or open this link t.me\/botfather<\/a> on your smartphone.<\/p>\n\n\n\n
![\"botfather\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/Telegram-Botfather.png?resize=362%2C198&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nThe following window should open, and you’ll be prompted to click the start<\/strong> button.<\/p>\n\n\n\n
![\"Telegram](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/start-bot-father-telegram.png?resize=352%2C708&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nType \/newbot<\/strong> and follow the instructions to create your bot. Give it a name and username. Mine is called Door Sensor<\/span>, and the username is ESPDoorSensorBot<\/span>.<\/p>\n\n\n\n
![\"Telegram](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/Create-bot-Telegram-Botfather_f.png?resize=354%2C396&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nIf your bot is successfully created, you’ll receive a message with a link to access the bot and the bot token<\/strong>. Save the bot token because you’ll need it so that the ESP8266 can interact with the bot.<\/p>\n\n\n\n
![\"Telegram](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/Bot-Token-Telegram-Bot-Father.png?resize=356%2C537&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nSending a Message to the Bot<\/h2>\n\n\n\n
This step is very important. Don’t miss it. Otherwise, the project will not work.<\/p>\n\n\n\n
You must send a message to your Telegram Bot from your Telegram account before it can send you messages.<\/p>\n\n\n\n
1)<\/strong> Go back to the chats tab, and in the search field, type the username of your bot.<\/p>\n\n\n\n
![\"Telegram](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/Search-for-your-bot.png?resize=300%2C607&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n2)<\/strong> Select your bot to start a conversation.<\/p>\n\n\n\n
3)<\/strong> Click on the Start link.<\/p>\n\n\n\n
![\"Star](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/start-bot-conversation.jpg?resize=300%2C610&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nAnd that’s it! You can proceed to the next section.<\/p>\n\n\n\n
Get Your Telegram User ID<\/h2>\n\n\n\n
To send a message to your Telegram account, the bot needs to know your user ID.<\/p>\n\n\n\n
In your Telegram account, search for “myidbot<\/strong>” or open this link t.me\/myidbot<\/a> on your smartphone.<\/p>\n\n\n\n
![\"Telegram](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/Telegram-ID-Bot.png?resize=348%2C173&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nStart a conversation with that bot and type \/getid<\/strong>. You will get a reply back with your user ID. Save that user ID<\/strong>, because you’ll need it later in this tutorial.<\/p>\n\n\n\n
![\"Telegram](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/Telegram-Get-Chat-ID.png?resize=354%2C500&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nPreparing Arduino IDE<\/h2>\n\n\n\n
We’ll program the ESP8266<\/a> board using Arduino IDE, so make sure you have it installed in your Arduino IDE.<\/p>\n\n\n\n
- Installing ESP8266 Board in Arduino IDE (Windows, Mac OS X, Linux)<\/a><\/li><\/ul>\n\n\n\n
Universal Telegram Bot Library<\/h3>\n\n\n\n
To interact with the Telegram bot, we’ll use the Universal Telegram Bot Library<\/a> created by Brian Lough that provides an easy interface for the Telegram Bot API.<\/p>\n\n\n\n
Follow the next steps to install the latest release of the library.<\/p>\n\n\n\n
- Click here to download the Universal Arduino Telegram Bot library<\/a>.<\/li>
- Go to Sketch <\/strong>> Include Library<\/strong> > Add.ZIP Library..<\/strong>.<\/li>
- Add the library you’ve just downloaded.<\/li><\/ol>\n\n\n\n
Important: <\/strong> don’t install the library through the Arduino Library Manager because it might install a deprecated version.<\/p>\n\n\n\n
For all the details about the library, take a look at the Universal Arduino Telegram Bot Library GitHub page<\/a>.<\/p>\n\n\n\n
ArduinoJson Library<\/h3>\n\n\n\n
You also have to install the ArduinoJson<\/a> library. Follow the next steps to install the library.<\/p>\n\n\n\n
- Go to Skech <\/strong>> Include Library<\/strong> > Manage Libraries<\/strong>.<\/li>
- Search for “ArduinoJson”.<\/li>
- Install the library.<\/li><\/ol>\n\n\n\n
We’re using ArduinoJson library version 6.15.2.<\/p>\n\n\n\n
![\"Install](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2020\/06\/Install-ArduinoJson-Library.png?resize=786%2C443&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nParts Required<\/h2>\n\n\n\n
Here’s the hardware that you need to complete this project:<\/p>\n\n\n\n
- ESP8266<\/a> – read Best ESP8266 Development Boards<\/a><\/li>
- 1\u00d7 Magnetic Reed Switch <\/a><\/li>
- 1\u00d7 10k\u03a9 resistor<\/a><\/li>
- 1\u00d7 breadboard<\/a><\/li>
- Jumper wires<\/a><\/li><\/ul>\n\n\n
You can use the preceding links or go directly to MakerAdvisor.com\/tools<\/a> to find all the parts for your projects at the best price!<\/p>
![](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/10\/header-200.png?w=1200&quality=100&strip=all&ssl=1\")
<\/a><\/p>\n\n\n\nSchematic \u2013 ESP8266 with Reed Switch<\/h2>\n\n\n\n
We wired the reed switch to GPIO 4<\/span> (D2), but you can connect it to any suitable GPIO.<\/p>\n\n\n\n
![\"Schematic](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/ESP8266-Reed-Switch-door-sensor-circuit.png?resize=558%2C444&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nCode<\/h2>\n\n\n\n
Copy the sketch below to your Arduino IDE. Replace the SSID, password, BOT token, and user ID with your credentials.<\/p>\n\n\n
\/* \n Rui Santos & Sara Santos - Random Nerd Tutorials\n Complete project details at https:\/\/RandomNerdTutorials.com\/esp8266-nodemcu-door-status-telegram\/\n Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.\n The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.\n*\/\n\n#include <ESP8266WiFi.h>\n#include <WiFiClientSecure.h>\n#include <UniversalTelegramBot.h>\n#include <ArduinoJson.h>\n\n\/\/ Set GPIOs for LED and reedswitch\nconst int reedSwitch = 4;\nconst int led = 2; \/\/optional\n\n\/\/ Detects whenever the door changed state\nbool changeState = false;\n\n\/\/ Holds reedswitch state (1=opened, 0=close)\nbool state;\nString doorState;\n\n\/\/ Auxiliary variables (it will only detect changes that are 1500 milliseconds apart)\nunsigned long previousMillis = 0; \nconst long interval = 1500;\n\nconst char* ssid = "REPLACE_WITH_YOUR_SSID";\nconst char* password = "REPLACE_WITH_YOUR_PASSWORD";\n\n\/\/ Initialize Telegram BOT\n#define BOTtoken "XXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \/\/ your Bot Token (Get from Botfather)\n\n\/\/ Use @myidbot to find out the chat ID of an individual or a group\n\/\/ Also note that you need to click "start" on a bot before it can\n\/\/ message you\n#define CHAT_ID "XXXXXXXXXX"\n\nX509List cert(TELEGRAM_CERTIFICATE_ROOT);\nWiFiClientSecure client;\nUniversalTelegramBot bot(BOTtoken, client);\n\n\/\/ Runs whenever the reedswitch changes state\nICACHE_RAM_ATTR void changeDoorStatus() {\n Serial.println("State changed");\n changeState = true;\n}\n\nvoid setup() {\n \/\/ Serial port for debugging purposes\n Serial.begin(115200);\n configTime(0, 0, "pool.ntp.org"); \/\/ get UTC time via NTP\n client.setTrustAnchors(&cert); \/\/ Add root certificate for api.telegram.org\n \n\n \/\/ Read the current door state\n pinMode(reedSwitch, INPUT_PULLUP);\n state = digitalRead(reedSwitch);\n\n \/\/ Set LED state to match door state\n pinMode(led, OUTPUT);\n digitalWrite(led, state);\n \n \/\/ Set the reedswitch pin as interrupt, assign interrupt function and set CHANGE mode\n attachInterrupt(digitalPinToInterrupt(reedSwitch), changeDoorStatus, CHANGE);\n\n \/\/ Connect to Wi-Fi\n WiFi.mode(WIFI_STA);\n WiFi.begin(ssid, password);\n while (WiFi.status() != WL_CONNECTED) {\n delay(500);\n Serial.print(".");\n }\n Serial.println("");\n Serial.println("WiFi connected"); \n\n bot.sendMessage(CHAT_ID, "Bot started up", "");\n}\n\nvoid loop() {\n if (changeState){\n unsigned long currentMillis = millis();\n if(currentMillis - previousMillis >= interval) {\n previousMillis = currentMillis;\n \/\/ If a state has occurred, invert the current door state \n state = !state;\n if(state) {\n doorState = "closed";\n }\n else{\n doorState = "open";\n }\n digitalWrite(led, state);\n changeState = false;\n Serial.println(state);\n Serial.println(doorState);\n \n \/\/Send notification\n bot.sendMessage(CHAT_ID, "The door is " + doorState, "");\n } \n }\n}\n<\/code><\/pre>\n\tView raw code<\/a><\/p>\n\n\n\n
How the Code Works<\/h2>\n\n\n\n
Continue reading to learn how the code works, or proceed to the Demonstration <\/a>section.<\/p>\n\n\n\n
First, include the required libraries.<\/p>\n\n\n\n
#include <ESP8266WiFi.h>\n#include <WiFiClientSecure.h>\n#include <UniversalTelegramBot.h>\n#include <ArduinoJson.h><\/code><\/pre>\n\n\n\nSet the GPIOs for the reed switch and LED (the on-board LED is GPIO 2). We’ll light up the on-board LED when the door is open.<\/p>\n\n\n\n
const int reedSwitch = 4;\nconst int led = 2; \/\/optional<\/code><\/pre>\n\n\n\nThe changeState<\/span> boolean variable indicates whether the door has changed state.<\/p>\n\n\n\n
bool changeState = false;<\/code><\/pre>\n\n\n\nThe state<\/span> variable will hold the reed switch state, and the doorState<\/span>, as the name suggests, will hold the door state\u2014closed or opened.<\/p>\n\n\n\n
bool state;\nString doorState;<\/code><\/pre>\n\n\n\nThe following timer variables allow us to debounce the switch. Only changes that have occurred with at least 1500 milliseconds between them will be considered.<\/p>\n\n\n\n
unsigned long previousMillis = 0; \nconst long interval = 1500;<\/code><\/pre>\n\n\n\nInsert your SSID and password in the following variables so that the ESP8266 can connect to the internet.<\/p>\n\n\n\n
const char* ssid = \"REPLACE_WITH_YOUR_SSID\";\nconst char* password = \"REPLACE_WITH_YOUR_PASSWORD\";<\/code><\/pre>\n\n\n\nInsert your Telegram Bot Token\u2014the one you’ve gotten in this step<\/a>.<\/p>\n\n\n\n
#define BOTtoken \"XXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\"<\/code><\/pre>\n\n\n\nInsert your chat ID\u2014the one you’ve gotten in this step<\/a>.<\/p>\n\n\n\n
#define CHAT_ID \"XXXXXXXXXX\"<\/code><\/pre>\n\n\n\nCreate a new Wi-Fi client with WiFiClientSecure<\/span>.<\/p>\n\n\n\n
X509List cert(TELEGRAM_CERTIFICATE_ROOT);\nWiFiClientSecure client;<\/code><\/pre>\n\n\n\nCreate a bot with the token and client defined earlier.<\/p>\n\n\n\n
UniversalTelegramBot bot(BOTtoken, client);<\/code><\/pre>\n\n\n\nThe changeDoorStatus()<\/span> function will run whenever a change is detected on the door state. This function simply changes the changeState<\/span> variable to true<\/span>. Then, in the loop(),<\/span> we’ll handle what happens when the state changes (invert the previous door state and send a message to your Telegram account).<\/p>\n\n\n\n
ICACHE_RAM_ATTR void changeDoorStatus() {\n Serial.println(\"State changed\");\n changeState = true;\n}<\/code><\/pre>\n\n\n\nsetup()<\/h3>\n\n\n\n
In the setup()<\/span>, initialize the Serial Monitor for debugging purposes:<\/p>\n\n\n\n
Serial.begin(115200);<\/code><\/pre>\n\n\n\nAdd a root certificate for api.telegram.org.<\/p>\n\n\n\n
client.setTrustAnchors(&cert); \/\/ Add root certificate for api.telegram.org<\/code><\/pre>\n\n\n\nSet the reed switch as an INPUT<\/span>. And save the current state when the ESP8266 first starts.<\/p>\n\n\n\n
pinMode(reedSwitch, INPUT_PULLUP);\nstate = digitalRead(reedSwitch);<\/code><\/pre>\n\n\n\nSet the LED as an OUTPUT<\/span> and set its state to match the reed switch state (circuit closed and LED off; circuit opened and LED on).<\/p>\n\n\n\n
pinMode(led, OUTPUT);\ndigitalWrite(led, state);<\/code><\/pre>\n\n\n\n- door closed \u2013> the ESP8266 reads a HIGH signal \u2013> turn off on-board LED (send a HIGH signal*)<\/li>
- door open \u2013> the ESP8266 reads a LOW signal \u2013> turn on on-board LED (send a LOW signal*)<\/li><\/ul>\n\n\n\n
* the ESP8266 on-board LED works with inverted logic\u2014send a HIGH signal to turn it off and a LOW signal to turn it on.<\/p>\n\n\n\n
Setting an interrupt<\/h4>\n\n\n\n
Set the reed switch as an interrupt.<\/p>\n\n\n\n
attachInterrupt(digitalPinToInterrupt(reedSwitch), changeDoorStatus, CHANGE);<\/code><\/pre>\n\n\n\nTo set an interrupt in the Arduino IDE, you use the attachInterrupt()<\/span> function, which accepts as arguments: the GPIO interrupt pin, the name of the function to be executed, and mode.<\/p>\n\n\n\n
The first argument is a GPIO interrupt. You should use digitalPinToInterrupt(GPIO)<\/span> to set the actual GPIO as an interrupt pin.<\/p>\n\n\n\n
The second argument of the attachInterrupt()<\/span> function is the name of the function that will be called every time the interrupt is triggered \u2013 the interrupt service routine (ISR). In this case, it is the changeDoorStatus<\/span> function.<\/p>\n\n\n\n
The ISR function should be as simple as possible, so the processor gets back to the execution of the main program quickly.<\/p>\n\n\n\n
The third argument is the mode. We set it to CHANGE<\/span> to trigger the interrupt whenever the pin changes value \u2013 for example, from HIGH to LOW and LOW to HIGH.<\/p>\n\n\n\n
To learn more about interrupts with the ESP8266, read the following tutorial:<\/p>\n\n\n\n
- ESP8266 Interrupts and Timers using Arduino IDE<\/a><\/li><\/ul>\n\n\n\n
Initialize Wi-Fi<\/h4>\n\n\n\n
The following lines connect the ESP8266 to Wi-Fi.<\/p>\n\n\n\n
WiFi.mode(WIFI_STA);\nWiFi.begin(ssid, password);\nwhile (WiFi.status() != WL_CONNECTED) {\n delay(500);\n Serial.print(\".\");\n}\nSerial.println(\"\");\nSerial.println(\"WiFi connected\"); <\/code><\/pre>\n\n\n\nSend a message to your Telegram account informing you that the bot started.<\/p>\n\n\n\n
bot.sendMessage(CHAT_ID, \"Bot started up\", \"\");<\/code><\/pre>\n\n\n\nloop()<\/h3>\n\n\n\n
In the loop()<\/span>, we’ll read the changeState<\/span> variable, and if a change has occurred, we’ll send a message to your Telegram account.<\/p>\n\n\n\n
First, check if a change occurred:<\/p>\n\n\n\n
if (changeState){<\/code><\/pre>\n\n\n\nThen, check if at least 1500 milliseconds have passed since the last state change.<\/p>\n\n\n\n
if(currentMillis - previousMillis >= interval) {<\/code><\/pre>\n\n\n\nIf that’s true, reset the timer and invert the current switch state:<\/p>\n\n\n\n
state = !state;<\/code><\/pre>\n\n\n\nIf the reed switch state is 1<\/span>(true), the door is closed. So, we change the doorState<\/span> variable to closed<\/span>.<\/p>\n\n\n\n
if(state) {\n doorState = \"closed\";\n}<\/code><\/pre>\n\n\n\nIf it’s 0<\/span>(false), the door is opened. <\/p>\n\n\n\n
else{\n doorState = \"open\";\n}<\/code><\/pre>\n\n\n\nSet the LED state accordingly and print the door state in the Serial Monitor.<\/p>\n\n\n\n
digitalWrite(led, state);\nchangeState = false;\nSerial.println(state);\nSerial.println(doorState); <\/code><\/pre>\n\n\n\nFinally, the following line sends a notification to your Telegram account with the current door state.<\/p>\n\n\n\n
bot.sendMessage(CHAT_ID, \"The door is \" + doorState, \"\");<\/code><\/pre>\n\n\n\nDemonstration<\/h2>\n\n\n\n
After modifying the sketch to include your network credentials, bot token, and user ID, upload it to your ESP8266. Go to Tools <\/strong>> Board <\/strong>and select your ESP8266 board. Then, go to Tools <\/strong>> Port <\/strong>and select the COM port the ESP8266 is connected to.<\/p>\n\n\n\n
Open the Serial Monitor at a baud rate of 115200 to check if the changes are detected.<\/p>\n\n\n\n
![\"ESP8266](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/Door-Sensor-Monitoring-Serial-Monitor-ESP32.png?resize=601%2C445&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nFor prototyping\/testing, you can apply the magnetic reed switch to your door using Velcro.<\/p>\n\n\n\n
![\"Testing](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2016\/02\/esp8266-featured-image-e1456180240355.png?resize=600%2C312&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nNow when someone opens\/closes your door, you receive a message in your Telegram account.<\/p>\n\n\n\n
![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2021\/09\/ESP32-ESP8266-Door-Sensor-Telegram-Bot-Demonstration-f.jpg?resize=300%2C611&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\nWrapping Up<\/h2>\n\n\n\n
In this tutorial, you’ve learned how to send notifications to your Telegram account when the reed switch changes state. This can be useful to detect if a door, window, or drawer was opened or closed.<\/p>\n\n\n\n
We have similar tutorials that you may like:<\/p>\n\n\n\n
- ESP8266 NodeMCU Door Status Monitor with Email Notifications (IFTTT)<\/a><\/li>
- Telegram: ESP8266 NodeMCU Motion Detection with Notifications (Arduino IDE)<\/a><\/li><\/ul>\n\n\n\n
Learn more about the ESP8266 with our resources:<\/p>\n\n\n\n
- Home Automation Using ESP8266<\/a><\/li>
- Build Web Servers with ESP32 and ESP8266 eBook (2nd Edition)<\/a><\/li>
- More ESP8266 Projects and Tutorials\u2026<\/a><\/li><\/ul>\n\n\n\n
Thanks for reading.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this project, you’re going to monitor the status of a door using an ESP8266 NodeMCU board and a magnetic reed switch. You’ll receive a message in your Telegram account whenever the door … <\/p>\n
- Build Web Servers with ESP32 and ESP8266 eBook (2nd Edition)<\/a><\/li>
- Telegram: ESP8266 NodeMCU Motion Detection with Notifications (Arduino IDE)<\/a><\/li><\/ul>\n\n\n\n
- ESP8266 NodeMCU Door Status Monitor with Email Notifications (IFTTT)<\/a><\/li>
- ESP8266 Interrupts and Timers using Arduino IDE<\/a><\/li><\/ul>\n\n\n\n
- 1\u00d7 Magnetic Reed Switch <\/a><\/li>
- Go to Sketch <\/strong>> Include Library<\/strong> > Add.ZIP Library..<\/strong>.<\/li>
- Click here to download the Universal Arduino Telegram Bot library<\/a>.<\/li>
- Installing ESP8266 Board in Arduino IDE (Windows, Mac OS X, Linux)<\/a><\/li><\/ul>\n\n\n\n