ESP8266

Params

802.11 b/g/n
Integrated low power 32-bit MCU
Integrated 10-bit ADC
Integrated TCP/IP protocol stack
Integrated TR switch, balun, LNA, power amplifier and matching network
Integrated PLL, regulators, and power management units
Supports antenna diversity
WiFi 2.4 GHz, support WPA/WPA2
Support STA/AP/STA+AP operation modes
Support Smart Link Function for both Android and iOS devices
SDIO 2.0, (H) SPI, UART, I2C, I2S, IR Remote Control, PWM, GPIO
STBC, 1×1 MIMO, 2×1 MIMO
A-MPDU & A-MSDU aggregation & 0.4s guard interval
Deep sleep power <10uA, Power down leakage current < 5uA
Wake up and transmit packets in < 2ms
Standby power consumption of < 1.0mW (DTIM3)
+20 dBm output power in 802.11b mode
Operating temperature range -40C ~ 125C
FCC, CE, TELEC, WiFi Alliance, and SRRC certified

Arduino IDE

Soubor → Vlastnosti: Additional Boards Manager URLs
http://arduino.esp8266.com/stable/package_esp8266com_index.json

Flash NodeMCU

https://github.com/nodemcu/nodemcu-flasher
https://github.com/marcelstoer/nodemcu-pyflasher (alternativa)

shell$ git clone https://github.com/nodemcu/nodemcu-flasher.git

Build NodeMCU

Vyplnit e-mail, kam přijdou odkazy ke stažení buildu NodeMCU. Dále vybrat moduly, které chceme mít ve zkompilovaném balíčku a potvrdit.

Zapojení ESP-12E

První program

first-program.ino

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
 
MDNSResponder mdns;
 
const char* ssid = "xxx";
const char* password = "xxx";
 
ESP8266WebServer server(80);
 
int ledState = 0;
 
void setup(){    
  delay(1000);
  Serial.begin(9600);  
 
  pinMode(D0, OUTPUT);
  digitalWrite(D0, LOW);
 
  Serial.println();
  Serial.print("Pripojuji k ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
 
  Serial.println();
  Serial.println("WiFi pripojena!");   
 
  Serial.print("Pouzij k pripojeni tuto adresu: ");
  Serial.print("http://");  
  Serial.println(WiFi.localIP());
 
  if (mdns.begin("esp8266", WiFi.localIP())) {
    Serial.println("MDNS responder started");
  }  
 
  server.on("/", [](){
    server.send(200, "text/html", returnWebPage(ledStateInfo(ledState)));
  });
 
  server.on("/ZapnoutSvetlo", [](){
    ledState = 1;
    server.send(200, "text/html", returnWebPage(ledStateInfo(ledState)));
    digitalWrite(D0, HIGH);
  });
 
  server.on("/VypnoutSvetlo", [](){
    ledState = 0;
    server.send(200, "text/html", returnWebPage(ledStateInfo(ledState)));
    digitalWrite(D0, LOW);
  });
 
  server.begin();
  Serial.println("HTTP server spusten");
}
 
void loop() {
  server.handleClient();
}
 
String returnWebPage(String message) {
  String webPage;
  webPage += "<!DOCTYPE html>";
  webPage += "<html>";
  webPage += "<head>";
  webPage += "<title>ESP8266 WebServer</title>";
  webPage += "<meta charset=\"UTF-8\">";
  webPage += "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">";
  webPage += "<link rel=\"stylesheet\" href=\"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css\" integrity=\"sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u\" crossorigin=\"anonymous\">";
  webPage += "</head>";
  webPage += "<body>";
  webPage += "<div class=\"container\">";
  webPage += "<h1 class=\"h3 text-center\">Wi-Fi LED</h1>";
  webPage += "<div class=\"row\">";
  webPage += "<div class=\"col-md-offset-4 col-md-4\">";
  webPage += "<div class=\"panel panel-default\">";
  webPage += "<div class=\"panel-heading\">";
  webPage += "<h3 class=\"panel-title\">Stav</h3>";
  webPage += "</div>";
  webPage += "<div class=\"panel-body text-center\">";
  webPage += message;
  webPage += "</div>";
  webPage += "</div>";
  webPage += "<div class=\"row\">";
  webPage += "<div class=\"col-xs-6\">";
  webPage += "<a class=\"btn btn-success btn-block\" href=\"/ZapnoutSvetlo\">ZAPNOUT</a>";
  webPage += "</div>";
  webPage += "<div class=\"col-xs-6\">";
  webPage += "<a class=\"btn btn-danger btn-block\" href=\"/VypnoutSvetlo\">VYPNOUT</a>";
  webPage += "</div>";
  webPage += "</div>";
  webPage += "</div>";             
  webPage += "</div>";
  webPage += "</div>";
  webPage += "</body>";
  webPage += "</html>";
 
  return webPage;
}
 
String ledStateInfo(int state) {
  if (state == 0) {
    return "VYPNUTO";
  } else {
    return "ZAPNUTO";
  }
}