Prepare:
- Install ESP8266 Board to Arduino IDE
- Program standalone ESP8266/ESP-12 WiFi module with Arduino IDE
- Simple Web Server example of standalone ESP8266/ESP-12 WiFi Module
This example modify from the last example Simple Web Server example of standalone ESP8266/ESP-12 WiFi Module, to control on-board LED. You need a Terminal program (ex. Arduino IDE's Serial Monitor) to display the ESP8266's IP.
ESP12-WebControlLed.ino
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
const char* ssid = "testAP";
const char* password = "12345678";
MDNSResponder mdns;
ESP8266WebServer server(80);
const int led = 13;
void handleRoot() {
server.send(200, "text/plain",
"hello from esp8266!) \n/on: to tuen LED ON \n/off: to tuen LED OFF \n");
}
void handleNotFound(){
digitalWrite(led, 1);
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET)?"GET":"POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i=0; i<server.args(); i++){
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/plain", message);
digitalWrite(led, 0);
}
void setup(void){
pinMode(led, OUTPUT);
digitalWrite(led, 0);
Serial.begin(115200);
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (mdns.begin("esp8266", WiFi.localIP())) {
Serial.println("MDNS responder started");
}
server.on("/", handleRoot);
server.on("/on", [](){
digitalWrite(BUILTIN_LED, LOW);
server.send(200, "text/plain", "LED ON");
});
server.on("/off", [](){
digitalWrite(BUILTIN_LED, HIGH);
server.send(200, "text/plain", "LED OFF");
});
server.onNotFound(handleNotFound);
server.begin();
Serial.println("HTTP server started");
//delay a moment,
//for terminal to receive inf, such as IP address
delay(1000);
Serial.end();
pinMode(BUILTIN_LED, OUTPUT);
}
void loop(void){
server.handleClient();
}
Android App to test:
- Android App to control Standalone ESP8266/ESP-12 on-board LED, using HttpClient, with Android example code.
- Android App to control Standalone ESP8266/ESP-12 on-board LED, using HttpURLConnection, with Android example code and APK for test without coding.
