Descripción

Módulo inalámbrico de comunicación Serial a Wifi ESP8266-01

Te permitirá agregar conectividad inalámbrica wifi a todos tus proyectos electrónicos basados en microcontrolador a un costo muy bajo.

Alcance: Hasta 100mts
802.11 b/g/ n
Voltaje de trabajo: 3.3v
Corriente de trabajo: 240ma
Wi-Fi Direct (P2P), soft-AP (SAP)
Stack de protocolos integrado TCP / IP
Soporta 3 modos: AP, STA, AP + STA
PLL , reguladores, DCXO y unidades de administración de energía integrados.
Potencia de salida: 19.5dBm en modo 802.11b
Consumo en modo de baja energía: < 10ua

Diagrama de conexión arduino

Código Arduino

#include <SoftwareSerial.h>

SoftwareSerial wifiSerial(2, 3); // RX, TX for ESP8266

bool DEBUG = true; //show more logs
int responseTime = 10; //communication timeout

void setup()
{
pinMode(13,OUTPUT); //set build in led as output
// Open serial communications and wait for port to open esp8266:
Serial.begin(115200);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
wifiSerial.begin(115200);
while (!wifiSerial) {
; // wait for serial port to connect. Needed for Leonardo only
}
sendToWifi(«AT+CWMODE=2»,responseTime,DEBUG); // configure as access point
sendToWifi(«AT+CIFSR»,responseTime,DEBUG); // get ip address
sendToWifi(«AT+CIPMUX=1»,responseTime,DEBUG); // configure for multiple connections
sendToWifi(«AT+CIPSERVER=1,80»,responseTime,DEBUG); // turn on server on port 80

sendToUno(«Wifi connection is running!»,responseTime,DEBUG);

}

void loop()
{
if(Serial.available()>0){
String message = readSerialMessage();
if(find(message,»debugEsp8266:»)){
String result = sendToWifi(message.substring(13,message.length()),responseTime,DEBUG);
if(find(result,»OK»))
sendData(«\nOK»);
else
sendData(«\nEr»);
}
}
if(wifiSerial.available()>0){

String message = readWifiSerialMessage();

if(find(message,»esp8266:»)){
String result = sendToWifi(message.substring(8,message.length()),responseTime,DEBUG);
if(find(result,»OK»))
sendData(«\n»+result);
else
sendData(«\nErrRead»); //At command ERROR CODE for Failed Executing statement
}else
if(find(message,»HELLO»)){ //receives HELLO from wifi
sendData(«\\nHI!»); //arduino says HI
}else if(find(message,»LEDON»)){
//turn on built in LED:
digitalWrite(13,HIGH);
}else if(find(message,»LEDOFF»)){
//turn off built in LED:
digitalWrite(13,LOW);
}
else{
sendData(«\nErrRead»); //Command ERROR CODE for UNABLE TO READ
}
}
delay(responseTime);
}

/*
* Name: sendData
* Description: Function used to send string to tcp client using cipsend
* Params:
* Returns: void
*/
void sendData(String str){
String len=»»;
len+=str.length();
sendToWifi(«AT+CIPSEND=0,»+len,responseTime,DEBUG);
delay(100);
sendToWifi(str,responseTime,DEBUG);
delay(100);
sendToWifi(«AT+CIPCLOSE=5»,responseTime,DEBUG);
}

/*
* Name: find
* Description: Function used to match two string
* Params:
* Returns: true if match else false
*/
boolean find(String string, String value){
return string.indexOf(value)>=0;
}

/*
* Name: readSerialMessage
* Description: Function used to read data from Arduino Serial.
* Params:
* Returns: The response from the Arduino (if there is a reponse)
*/
String readSerialMessage(){
char value[100];
int index_count =0;
while(Serial.available()>0){
value[index_count]=Serial.read();
index_count++;
value[index_count] = ‘\0’; // Null terminate the string
}
String str(value);
str.trim();
return str;
}

 

/*
* Name: readWifiSerialMessage
* Description: Function used to read data from ESP8266 Serial.
* Params:
* Returns: The response from the esp8266 (if there is a reponse)
*/
String readWifiSerialMessage(){
char value[100];
int index_count =0;
while(wifiSerial.available()>0){
value[index_count]=wifiSerial.read();
index_count++;
value[index_count] = ‘\0’; // Null terminate the string
}
String str(value);
str.trim();
return str;
}

 

/*
* Name: sendToWifi
* Description: Function used to send data to ESP8266.
* Params: command – the data/command to send; timeout – the time to wait for a response; debug – print to Serial window?(true = yes, false = no)
* Returns: The response from the esp8266 (if there is a reponse)
*/
String sendToWifi(String command, const int timeout, boolean debug){
String response = «»;
wifiSerial.println(command); // send the read character to the esp8266
long int time = millis();
while( (time+timeout) > millis())
{
while(wifiSerial.available())
{
// The esp has data so display its output to the serial window
char c = wifiSerial.read(); // read the next character.
response+=c;
}
}
if(debug)
{
Serial.println(response);
}
return response;
}

/*
* Name: sendToUno
* Description: Function used to send data to Arduino.
* Params: command – the data/command to send; timeout – the time to wait for a response; debug – print to Serial window?(true = yes, false = no)
* Returns: The response from the esp8266 (if there is a reponse)
*/
String sendToUno(String command, const int timeout, boolean debug){
String response = «»;
Serial.println(command); // send the read character to the esp8266
long int time = millis();
while( (time+timeout) > millis())
{
while(Serial.available())
{
// The esp has data so display its output to the serial window
char c = Serial.read(); // read the next character.
response+=c;
}
}
if(debug)
{
Serial.println(response);
}
return response;
}