Handson Technology ESP8266 WiFi Manuale utente

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ESP8266 WiFi

The ESP8266 is the name of a micro controller designed by Espressif Systems. The

ESP8266 itself is a self-contained WiFi networking solution offering as a bridge from

existing micro controller to WiFi and is also capable of running self-contained applications.

This module comes with a built in USB connector and a rich assortment of pin-outs. With a

micro USB cable, you can connect NodeMCU devkit to your laptop and flash it without any

trouble, just like Arduino. It is also immediately breadboard friendly.

2
 
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Table ofContents 
1. 
Specification..........................................................................................................................................3 
2. 
Pin Definition .........................................................................................................................................3 
3. 
Using ArduinoIDE .................................................................................................................................3 
 Install the ArduinoIDE 1.6.4or greater..................................................................................................4 
 Installthe ESP8266Board Package................................................................................................4 
 SetupESP8266Support.................................................................................................................5 
 Blink Test........................................................................................................................................7 
 Connecting viaWiFi........................................................................................................................9 
4. 
FlashingNodeMCUFirmwareon theESP8266usingWindows............................................................12 
 PartsRequired...................................................................................................................................12 
 Pin Assignment..................................................................................................................................12 
 Wiring................................................................................................................................................13 
 Downloading NodeMCU FlasherforWindows ....................................................................................13 
 Flashing your ESP8266usingWindows..............................................................................................13 
5. 
Getting Started with the ESPlorerIDE ..................................................................................................15 
 Installing ESPlorer .............................................................................................................................15 
 Schematics........................................................................................................................................18 
 Writing YourLua Script.......................................................................................................................18 
6. 
NodeMCU GPIOfor Lua..........................................................................................................................22 
7. 
WebResources.......................................................................................................................................22

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Specification:

•

Voltage:3.3V.

•

Wi-Fi Direct (P2P), soft-AP.

•

Current consumption: 10uA~170mA.

•

Flash memory attachable: 16MB max (512K normal).

•

Integrated TCP/IP protocol stack.

•

Processor: Tensilica L106 32-bit.

•

Processor speed: 80~160MHz.

•

RAM: 32K + 80K.

•

GPIOs: 17 (multiplexed with other functions).

•

Analog to Digital: 1 input with 1024 step resolution.

•+19.5dBm output power in 802.11b mode

•

802.11 support: b/g/n.

•

Maximum concurrent TCP connections: 5.

Pin Definition:

Using ArduinoIDE

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8266

odu

transceiver. However, this is not convenient. What we recommend is using the very cool Arduino ESP8266 project,

which is a modified version of the Arduino IDE that you need to install on your computer. This makes it very

convenienttousetheESP8266chipaswewillbeusingthewell-knownArduinoIDE.Followingthebelowstepto

installESP8266librarytowork inArduinoIDEenvironment.

Install the Arduino IDE 1.6.4 or greater

Download Arduino IDE from Arduino.cc (1.6.4 or greater) - don't use 1.6.2 or lower version! You can use your

existing IDEif youhave alreadyinstalled it.

You can also try downloading the ready-to-go package from the ESP8266-Arduino project, if the proxy is giving you

problems.

Install the ESP8266 Board Package

266

abl

pack

age_

8266

Addi

ard

field in the Arduino v1.6.4+ preferences.

Click ‘File’ -> ‘Preferences’ to access this panel.

Next, use the Board manager to install the ESP8266 package.

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Click ‘Tools’ -> ‘Board:’ -> ‘Board Manager…’ to access this panel.

Scroll down to ‘esp8266 by ESP8266 Community ’and click “Install” button to install the ESP8266 library package.

Onceinstallationcompleted,closeandre-openArduinoIDEforESP8266librarytotakeeffect.

Setup ESP8266Support

Whenyou'verestartedArduinoIDE,select‘GenericESP8266Module’fromthe‘Tools’->‘Board:’dropdownmenu.

Select 80 MHz as the CPU frequency (you can try 160 MHz overclock later)

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Select‘115200’bauduploadspeedisagoodplacetostart-lateronyoucantryhigherspeedsbut115200isagood

safe place tostart.

GotoyourWindows‘Device Manager’ tofindoutwhichComPort‘USB-SerialCH340’ isassignedto.Selectthe

matchingCOM/serialportforyourCH340USB-Serialinterface.

void setup() {

pinMode(5, OUTPUT); // GPIO05, Digital Pin D1

}

void loop() {

digitalWrite(5, HIGH);

delay(900);

digitalWrite(5, LOW);

delay(500);

}

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Find out which Com Port is assign for CH340

SelectthecorrectComPortasindicatedon‘Device Manager”

Note: if this is your first time using CH340 “USB-to-Serial ”interface, please install the driver first before proceed

theaboveComPortsetting.TheCH340drivercanbedownloadfromthebelowsite:

b.c

t/tr

Blink Test

We'll begin with the simple blink test.

Enter this into the sketch window (and save since you'll have to). Connect a LED as shown in Figure3-1.

Nowyou'llneedtoputtheboardintobootloadmode.You'llhavetodothisbeforeeachupload.Thereisnotimeout

for bootloadmode, soyou don't haveto rush!

•Hold down the ‘Flash’ button.

•While holding down ‘Flash’, press the ‘RST’ button.

•Release‘RST’, then release‘Flash’

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•Whenyoureleasethe‘RST’ button,theblueindicationwillblinkonce,thismeansitsreadytobootload.

Once the ESP board is in bootload mode, upload the sketch via the IDE, Figure 3-2.

Figure3-1: Connection diagram for the blinking test

// key in your own SSID

// key in your own WiFi access point

const char* password = "abc1234";

password

= "handson";

const char* ssid

* Simple HTTP get webclient test

#include <ESP8266WiFi.h>

Figure 3.2: Uploading the sketch to ESP8266 NodeMCU module.

The sketch will start immediately - you'll see the LED blinking. Hooray!

Connecting via WiFi

OKonce you'vegotthe LEDblinking,let’s go straighttothe fun part, connecting toa webserver. Create anew sketch

with thiscode:

Don’t forget to update:

constchar*ssid = "yourssid";

const char* password = "yourpassword";

toyourWiFiaccesspointandpassword,thenuploadthesameway:getintobootloadmode,thenuploadcodevia

IDE.

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const char* host = "www.handsontec.com";

void setup() {

Serial.begin(115200);

delay(100);

// We start by connecting to a WiFi network

Serial.println();

Serial.print("Connecting to ");

Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println("");

Serial.println("WiFi connected");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

}

int value = 0;

void loop() {

delay(5000);

++value;

Serial.print("connecting to ");

Serial.println(host);

// Use WiFiClient class to create TCP connections

WiFiClient client;

const int httpPort = 80;

if (!client.connect(host, httpPort)) {

Serial.println("connection failed");

return;

}

// We now create a URI for the request

String url = "/projects/index.html";

Serial.print("Requesting URL: ");

Serial.println(url);

// This will send the request to the server

client.print(String("GET ") + url + " HTTP/1.1\r\n" +

"Host: " + host + "\r\n" +

"Connection: close\r\n\r\n");

delay(500);

// Read all the lines of the reply from server and print them to Serial

while(client.available()){

String line = client.readStringUntil('\r');

Serial.print(line);

}

Serial.println();

Serial.println("closing connection");

}

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