TechDotTeach

 HTML HTML stands for  Hyper Text Markup Language  . HTML is the standard markup language for creating Web pages. HTML describes the structure of a Web pages. HTML consists of a series of elements. HTML elements tell the browser how to display the content. HTML elements label pieces of content such as "this is a heading", "this is a paragraph", "this is a link", etc. A Simple HTML Document < !DOCTYPE  html > < html > < head > < title >Title of webpage< /title > < /head > < body > < h1 >My first web page. < /h1 > < p > My first web page. < /p > < /body > < /html >

Introduction   The NodeMCU ( N ode  M icro C ontroller  U nit) i s an open-source development board having Lua based firmware that run on the ESP8266 Wi-Fi SoC, developed by Espressif System, and hardware based on the ESP-12 module. It is a low cost based which is mostly used in the field of IOT. Description NodeMCU is an open-source development board that is based on the ESP8266 microcontroller. It is designed for Internet of Things (IoT) applications and can be programmed using the Lua scripting language or the Arduino programming language. NodeMCU includes built-in Wi-Fi connectivity, which allows it to connect to the internet and to other devices. NodeMCU has a built-in microcontroller that can be programmed to perform various tasks such as reading sensor data, controlling actuators, and communicating with other devices. NodeMCU has a variety of input and output pins that can be used to connect to sensors, actuators, and other devices. NodeMCU is compatible with a wid...

  Z-Wave is a wireless communication protocol that is used for home automation and other low-power, low-data-rate applications. It is based on the ITU-T G.9959 standard and uses the 908.42 MHz frequency band. Z-Wave devices can be used to create a mesh network, in which each device can act as a relay for other devices, allowing for a larger coverage area. Z-Wave devices are typically used in home automation, industrial automation, healthcare, and other applications that require low-power, low-cost, and low-data-rate wireless communication. Z-Wave devices can be powered by batteries and have a longer battery life compared to other wireless technologies. Z-Wave networks can be secured using AES-128 encryption. Z-Wave Alliance is a group of companies that develop and promote Z-Wave technology. Z-Wave devices can be connected to other networks using Z-Wave-to-IP gateways, which allow for remote control and monitoring of Z-Wave devices over the Internet. Z-Wave devices can be integrated...

  NFC (Near Field Communication) is a short-range wireless technology that allows devices to communicate with each other when they are brought close together, typically within a distance of less than 10 centimeters. It is based on the ISO/IEC 18092 standard and uses the 13.56 MHz frequency band. NFC uses two different communication modes: Peer-to-peer mode, in which two devices can communicate with each other and exchange data. Reader/writer mode, in which a device, such as a smartphone or a point-of-sale terminal, can read data from a passive tag or a smart card. NFC devices, such as smartphones and smartwatches, can be used to make contactless payments, access public transportation, and share data with other NFC devices. NFC devices can also be used for access control, such as opening doors or starting cars. NFC tags are small, passive devices that can be placed on objects and can store a small amount of data, such as a web URL or a phone number. NFC tags can be read by any NFC-e...

  LoRaWAN (Long Range Wide Area Network) is a low-power, wide-area network (LPWAN) protocol that is designed to wirelessly connect battery-powered devices to the internet in regional, national, or global networks. It is based on the LoRa (Long Range) modulation technology, which uses a combination of spread-spectrum and chirp-spread-spectrum techniques to provide long-range communication and high resistance to interference. LoRaWAN networks use the unlicensed ISM (Industrial, Scientific, and Medical) bands, typically in the 868 MHz and 915 MHz frequency ranges, to provide wireless connectivity. LoRaWAN networks use a star-of-stars topology in which gateways, or base stations, connect to the network server and relay data between devices and the internet. LoRaWAN networks can cover a wide area and can provide a range of several kilometers in urban areas and up to several tens of kilometers in rural areas. LoRaWAN networks are designed for low-power devices, such as sensors and actuat...

  RFID (Radio-Frequency Identification) is a wireless technology that uses radio waves to communicate between a device, called a tag, and a reader. The tag, which can be in the form of a chip or a label, contains a microchip and an antenna, and can be attached to an object. The reader, which is a device that sends and receives radio waves, uses an antenna to send out radio waves and receives signals from the tag. RFID technology can be used for a wide range of applications such as inventory management, supply chain management, asset tracking, access control, and many more. RFID tags can store a small amount of data and can be used to identify and track items, such as products in a warehouse or livestock on a farm. RFID tags can be passive, meaning they do not have their own power source and rely on the energy from the reader's signal to power up and respond, or active, meaning they have their own power source and can transmit signals back to the reader. RFID readers can be handheld...