Wemos D1 Boards

Ai-Thinker ESP8266 modules (ESP-12F, black color) soldered to breakout boards (white color)

This is the first series of modules made with the ESP8266 by the third-party manufacturer Ai-Thinker and remains the most widely available.[19] They are collectively referred to as "ESP-xx modules". To form a workable development system they require additional components, especially a serial TTL-to-USB adapter (sometimes called a USB-to-UART bridge) and an external 3.3 volt power supply.

Remotely controlling any devices with your mobile phone or your laptop are all made easy with ESP8266 module develop by Espressif Systems.

The ESP8266 offers a complete and self contained Wi-Fi network solution, allowing it to either host the application or to offload all Wifi networking functions from another application processor.

When ESP8266 host application boot up directly from the external flash. It has integrated cache to improve the performance of the system in such applications, and to minimize the memory requirements.

Alternately, serving as a Wifi adapter, wireless internet access can be added to any microcontroller-based design with simple connectivity through UART interface or the CPU AHB bridge interface.

ESP8266 on-board storage and processing capabilities allow it to be integrated with the sensors and other devices or other application specific devices through GPIOs with minimal development up-front and minimal loading runtime. With its high degree on-chip integration, which includes the antenna switch and power management converters, it is requires minimal external circuitry, and the entire solution, including front-end module is designed to occupy minimal PCB area.

ESP8266 has also sophisticated system-level features include fast sleep and awake context switching for energy efficient VoIP adaptable, radio biasing for low-power operation, advance signal processing, and spur cancellation and radio co-existence features for common cellular, Bluetooth, DDR, LVDR, LCD interference mitigation.

Features:

802.11 b/g/n protocol

Wifi direct (P2P), soft Access Point

Integrated TCP/IP protocol stack

Integrated TR switch, balun (Signal Balancer), LNA, Power Amp and Matching Network

Integrated PLL, regulators, and power management units.

+19.5dBm output power in 802.11b mode.

Integrated temperature sensor

Support antenna diversity

Power down leakage current of < 10uA

Integrated low power 32bit CPU could be used as application processor

SDIO 2.0, SPI, UART

STBC, 1 x 1 MIMO, 2X1 MIMO

A-MPDU & A-MSDU aggregation & 0.4ua guard interval

Wake up and transmit packets in < 2ms

Standby power consumption of < 1.0mW (DTIM3)

In this project we will going to wire the ESP8266 that works as stand alone.

Required Electronic Parts.

1x ESP8266 Wifi Module

1x 500 Ohms Resistor

3v Power Supply or 2 AA Batteries

Jumper Wire

Novice ESP8266 developers are encouraged to consider larger ESP8266 Wi-Fi development boards like the NodeMCU which includes the USB-to-UART bridge and a Micro-USB connector coupled with a 3.3 volt power regulator already built into the board. When project development is complete, those components are not needed and these cheaper ESP-xx modules are a lower power, smaller footprint option for production runs.

The reason for the popularity of many of these boards over the earlier ESP-xx modules is the inclusion of an on-board USB-to-UART bridge (like the Silicon Labs' CP2102 or the WCH CH340G) and a Micro-USB connector, coupled with a 3.3-volt regulator to provide both power to the board and connectivity to the host (software development) computer – commonly referred to as the console, making it an easy development platform.

Many ESP-xx modules include a small onboard LED which can be programmed to blink and thereby indicate activity. There are several antenna options for ESP-xx boards including a trace antenna, an onboard ceramic antenna, and an external connector that allows an external Wi-Fi antenna to be attached.

Since Wi-Fi communications generate a lot of RFI (Radio Frequency Interference), governmental bodies like the FCC like shielded electronics to minimize interference with other devices. Some of the ESP-xx modules come housed within a metal box with an FCC seal of approval stamped on it. First and second world markets will likely demand FCC approval and shielded Wi-Fi devices

With earlier ESP-xx modules, these two items (the USB-to-serial adapter and the regulator) had to be purchased separately and be wired into the ESP-xx circuit. Modern ESP8266 boards like the NodeMCU are easier to work with and offer more GPIO pins.

Most of the boards listed here are based on the ESP-12E module, but new modules are being introduced seemingly every few months.

code

gpio.write(4, gpio.LOW)

wifi.setmode(wifi.STATIONAP)

wifi.setmode(wifi.STATION)

wifi.sta.config("SSID","PASSWORD")

wifi.sta.setip({ip="192.168.200.100",netmask="255.255.255.0",gateway="192.168.200.1"})

srv=net.createServer(net.TCP)

srv:listen(80,function(conn)

    conn:on("receive", function(client,request)

        local buf = "";

        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");

        if(method == nil)then

            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP");

        end

        local _GET = {}

        if (vars ~= nil)then

            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do

                _GET[k] = v

            end

        end

        buf = buf.."<h1> www.14core.com <br/> Your first IOT LED Using Stand-alone ESP8266 WIFI via Web Browser.</h1><form src=\"/\">Turn<select name=\"pin\" onchange=\"form.submit()\">";

        local _on,_off = "",""

        if(_GET.pin == "ON")then

              _on = " selected=true";

              gpio.write(4, gpio.HIGH);

        elseif(_GET.pin == "OFF")then

              _off = " selected=\"true\"";

              gpio.write(4, gpio.LOW);

        end

        buf = buf.."<option".._on..">ON</opton><option".._off..">OFF</option></select></form>";

        client:send(buf);

        client:close();

        collectgarbage();

    end)

end)

Get one value from websites

The next code explain how to get the last value of a Ubidots value, the code will save the value inside “value” variable. If you want to use this example don’t forget to change TOKEN, WIFISSID and PASSWORD.

Setup

Download Arduino IDE.

Open you IDE and click on File -> Preferences.

In Aditional Boards Manager URLs add this line and click on “OK”: “http://arduino.esp8266.com/stable/package_esp8266com_index.json”

Go to Tools -> Board -> Boards Manager, type “ESP8266” and install it.

Go againt to Tools -> Board and select “Generic ESP8266 Module”.

Download the UbidotsMicroESP8266 library here

Go to the Arduino IDE, click on Sketch -> Include Library -> Add .ZIP Library

Select the .ZIP file of the ESP8266 library and then “Accept” or “Choose”

Close the Arduino IDE and open it again.

Requirements

An ESP8266 module.

An Arduino UNO , UARTbee or any UART to USB device.

Arduino IDE version 1.6.6 or higher.

Jumper wires.