Arduino-er

Tuesday, May 3, 2016

NodeMCU/ESP8266 act as AP (Access Point) and web server to control GPIO

Further works on previous exercise "NodeMCU/ESP8266 act as AP (Access Point) and simplest Web Server"; this example of NodeMCU/ESP8266 act as AP and implement a web server to control GPIO (on-board LED) using HTML interface.

ESP_AP_WebServer.ino

/*
 * NodeMCU/ESP8266 act as AP (Access Point) and simplest Web Server
 * to control GPIO (on-board LED)
 * Connect to AP "arduino-er", password = "password"
 * Open browser, visit 192.168.4.1
 */
#include <ESP8266WiFi.h>
#include <WiFiClient.h> 
#include <ESP8266WebServer.h>

const char *ssid = "arduino-er";
const char *password = "password";
int stateLED = LOW;

ESP8266WebServer server(80);

void handleRoot() {
    response();
}

void handleLedOn() {
  stateLED = LOW;
  digitalWrite(LED_BUILTIN, stateLED);
  response();
}

void handleLedOff() {
  stateLED = HIGH;
  digitalWrite(LED_BUILTIN, stateLED);
  response();
}

const String HtmlHtml = "<html><head>"
    "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\" /></head>";
const String HtmlHtmlClose = "</html>";
const String HtmlTitle = "<h1>Arduino-er: ESP8266 AP WebServer exercise</h1><br/>\n";
const String HtmlLedStateLow = "<big>LED is now <b>ON</b></big><br/>\n";
const String HtmlLedStateHigh = "<big>LED is now <b>OFF</b></big><br/>\n";
const String HtmlButtons = 
    "<a href=\"LEDOn\"><button style=\"display: block; width: 100%;\">ON</button></a><br/>"
    "<a href=\"LEDOff\"><button style=\"display: block; width: 100%;\">OFF</button></a><br/>";

void response(){
  String htmlRes = HtmlHtml + HtmlTitle;
  if(stateLED == LOW){
    htmlRes += HtmlLedStateLow;
  }else{
    htmlRes += HtmlLedStateHigh;
  }

  htmlRes += HtmlButtons;
  htmlRes += HtmlHtmlClose;

  server.send(200, "text/html", htmlRes);
}

void setup() {
    delay(1000);
    Serial.begin(9600);
    Serial.println();

    WiFi.softAP(ssid, password);

    IPAddress apip = WiFi.softAPIP();
    Serial.print("visit: \n");
    Serial.println(apip);
    server.on("/", handleRoot);
    server.on("/LEDOn", handleLedOn);
    server.on("/LEDOff", handleLedOff);
    server.begin();
    Serial.println("HTTP server beginned");
    pinMode(LED_BUILTIN, OUTPUT);
    digitalWrite(LED_BUILTIN, stateLED);
}

void loop() {
    server.handleClient();
}

Next:
- NodeMCU/ESP8266 implement WebSocketsServer to control RGB LED

- more example of "ESP8266 core for Arduino".

2WD Smart Robot Car

2WD Smart Car, can be controlled by Arduino/Genuino, NodeMCU/ESP8266, Raspberry Pi...etc.

This timelapse video of assembling 2WD Smart Car made with Raspberry Pi Camera Module without alignment for close focus, so...it's little bit out focus!

Monday, May 2, 2016

NodeMCU/ESP8266 act as AP (Access Point) and simplest Web Server

NodeMCU/ESP8266 example act as AP (Access Point) and simplest Web Server:

ESP_AP_WebServer.ino

/*
 * NodeMCU/ESP8266 act as AP (Access Point) and simplest Web Server
 * Connect to AP "arduino-er", password = "password"
 * Open browser, visit 192.168.4.1
 */
#include <ESP8266WiFi.h>
#include <WiFiClient.h> 
#include <ESP8266WebServer.h>

const char *ssid = "arduino-er";
const char *password = "password";

ESP8266WebServer server(80);

void handleRoot() {
    server.send(200, "text/html", "<h1>Hello! from arduino-er!</h1>");
}

char* htmlBody_help = "<h1>Help</h1><br/>\n"
  "Visit http://192.168.4.1/ to access web server.<br/>\n"
  "Visit http://192.168.4.1/help to access this page.<br/>\n";

void handleHelp(){
  server.send(200, "text/html", htmlBody_help);
}

void setup() {
    delay(1000);
    Serial.begin(9600);
    Serial.println();

    WiFi.softAP(ssid, password);

    IPAddress apip = WiFi.softAPIP();
    Serial.print("visit: \n");
    Serial.println(apip);
    server.on("/", handleRoot);
    server.on("/help", handleHelp);
    server.begin();
    Serial.println("HTTP server beginned");
}

void loop() {
    server.handleClient();
}

Next:
- NodeMCU/ESP8266 act as AP (Access Point) and web server to control GPIO

- more example of "ESP8266 core for Arduino".