Arduino + ESP8266
1. Rangkaian yang digunakan
Diagram :
2. Code
#include "WiFiEsp.h"
char ssid[] = "ArduinoMySQL"; // Isi dengan nama profil Wifi
char pass[] = "12345678"; // password wifi
//char server[] = "192.168.123.1"; // alamat access point yang telah terinstall XAMPP local host
char server[] = "semesin.com"; // alamat web hosting
char namaVariabel[] = "Variabel";
String text = "";
String Respon = "";
bool responDariServer = false;
bool statusKomunikasiWifi = false;
long waktuMulai;
long waktuMintaData = 5000; //minta data setiap 5000ms
WiFiEspClient client;
int status = WL_IDLE_STATUS;
void setup()
{
Serial.begin(9600);
Serial.println("Koneksi arduino dengan mySql menggunakan ESp8266 dan XAMPP");
Serial.println("Ketik pesan yang akan dikirim (pastikan setting serial ke \"both NL & CR\")");
Serial.println("http://www.semesin.com/project");
Serial.println();
Serial1.begin(115200);
WiFi.init(&Serial1);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
// you're connected now, so print out the data
Serial.println("You're connected to the network");
printWifiStatus();
waktuMulai = millis();
}
void loop()
{
//tunggu imputan nilai dari untuk dikirim ke server
while(Serial.available())
{
char c = Serial.read();
if((c != '\r') && (c != '\n'))
{
text += c;
}
if(c == '\n')
{
statusKomunikasiWifi = kirimKeDatabase("dataDariSerial",text);
text = "";
waktuMulai = millis();
}
}
if(waktuMintaData < millis() - waktuMulai)
{
statusKomunikasiWifi = ambilDatabase("perintah");
waktuMulai = millis();
}
// periksa respon dari server
if(statusKomunikasiWifi)
{
// if there are incoming bytes available
// from the server, read them and print them
while (client.available())
{
char c = client.read();
Respon += c;
}
// if the server's disconnected, stop the client
if (!client.connected()) {
Serial.println("Disconnecting from server...");
client.stop();
statusKomunikasiWifi = false;
responDariServer = true;
}
}
// penanganan data yang diretima dari server
if(responDariServer)
{
responDariServer = false;
//Serial.println(Respon);
int posisiData = Respon.indexOf("\r\n\r\n");
String Data = Respon.substring(posisiData+4);
Data.trim();
String variabel;
String nilai;
Serial.println("Data dari server");
posisiData = Data.indexOf('=');
if(posisiData > 0)
{
variabel = Data.substring(0,posisiData);
nilai = Data.substring(posisiData+1);
//===========Penanganan respon disini
Serial.print(variabel);
Serial.print(" = ");
Serial.println(nilai);
}
Respon = "";
}
}
bool ambilDatabase(String variabel)
{
Serial.println();
Serial.println("Starting connection to server...");
// if you get a connection, report back via serial
if (client.connect(server, 80)) {
Serial.println("Connected to server");
// Make a HTTP request
client.print("GET /arduino_mysql/keArduino.php?variabel=");
client.print(variabel);
client.println(" HTTP/1.1");
client.print("Host: ");
client.println(server);
client.println("Connection: close");
client.println();
long _startMillis = millis();
while (!client.available() and (millis() - _startMillis < 2000));
return true;
}
return false;
}
bool kirimKeDatabase(String namaVariabel, String nilai)
{
Serial.println();
Serial.println("Starting connection to server...");
// if you get a connection, report back via serial
if (client.connect(server, 80)) {
Serial.println("Connected to server");
// Make a HTTP request
// parameter 1
client.print("GET /arduino_mysql/dariArduino.php?");
client.print("variabel=");
client.print(namaVariabel);
// parameter 2 dan selanjutnya
client.print("&");
client.print("nilai=");
client.print(nilai);
client.println(" HTTP/1.1");
client.print("Host: ");
client.println(server);
client.println("Connection: close");
client.println();
return true;
}
return false;
}
void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength
long rssi = WiFi.RSSI();
Serial.print("Signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
IPAddress gateway = WiFi.gatewayIP();
Serial.print("gateway:");
Serial.print(gateway);
Serial.println(" ");
}
