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ESP8266 - WiFi Module

  • ESP8266 - Wi-Fi Module
    ESP8266 - WiFi Module
    Content

    1
    Introduction
    2
    Features of ESP8266
    3
    How to Interface ESP8266 with Arduino Uno
    3.1
    Hardware and Software required
    3.2
    Circuit Diagram
    6
    Program for ESP8266

    Introduction to ESP8266

    The ESP8266 Wi-Fi Module is a self contained SOC with integrated TCP/IP protocol stack that can give any micro-controller access to your Wi-Fi network. The ESP8266 is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor.This module has a powerful enough on-board processing and storage capability that allows it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during run-time. Its high degree of on-chip integration allows for minimal external circuitry, including the0front-end module, is designed to occupy minimal PCB area. The ESP8266 supports APSD for VoIP applications and Bluetooth co-existence interfaces, it contains a self-calibrated RF allowing it to work under all operating conditions, and requires no external RF parts. The applications of ESP8266 are Smart power plugs, Home automation, Wi-Fi location-aware devices, Industrial wireless control, Security ID tags.

    Features of ESP8266
    · 802.11 b/g/n protocol
    · Wi-Fi Direct (P2P), soft-AP
    · Integrated TCP/IP protocol stack
    · Integrated TR switch, balun, LNA, power amplifier and matching network
    · Integrated PLL, regulators, and power management units
    · +19.5dBm output power in 802.11b mode
    · Integrated temperature sensor
    · Supports antenna diversity
    · Power down leakage current of < 10uA
    · Integrated low power 32-bit CPU could be used as application processor
    · Wake up and transmit packets in < 2ms
    · Standby power consumption of < 1.0mW (DTIM3)

    How to Interface ESP8266 with Arduino UNO?

    Hardware and Software required


    • Arduino IDE


    Circuit Diagram of ESP8266 with Arduino UNO
    The ESP8266 module should be connected to UNO as shown in the below image:

    ESP8266 - WiFi Module and Arduino Circuit Diagram

    Note:Sometimes the Arduino has power fluctuations which may cause damage to the ESP8266 module.In such case,it is better to use 3.3v regulator or Logic Level converter to power the ESP8266 module.

    Program for ESP8266

    Upload the program given below to the uno board.Open the serial monitor and type the AT commands which is attached here.The user will get the corresponding response for the AT commands in the serial monitor.

    #include
    SoftwareSerial ESPserial(2, 3); // RX | TX
    void setup()
    {
       Serial.begin(9600);     // communication with the host computer
       while (!Serial)   { ; }
       // Start the software serial for communication with the ESP8266
       ESPserial.begin(9600);  
       Serial.println("");
       Serial.println("Remember to to set Both NL & CR in the serial monitor.");
       Serial.println("Ready");
       Serial.println("");    
    }
    void loop()
    {
       // listen for communication from the ESP8266 and then write it to the serial monitor
       if ( ESPserial.available() )
      {  
       Serial.write( ESPserial.read() );
      }
      // listen for user input and send it to the ESP8266
       if ( Serial.available() )      
      {  
       ESPserial.write( Serial.read() );
      }
    }

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