NodeMCU ESP8266 ile WiFi Üzerinden OLED Mesaj Uygulaması
NodeMCU ESP8266 yazılarımıza yeni bir tanesini ekliyoruz. Bu yazımızda ESP8266 ile WiFi üzerinden OLED ekrana mesaj gönderme uygulaması yapıyoruz. Bu yazıya kadar yazdığımız tüm ESP8266 yazılarımızda Arduino IDE’ye NodeMCU desteği eklemeyi, IDE üzerinden program yüklemeyi, ve .BIN dosyasını flashlamayı incelemiştik. Bu yazımızdan itibaren bu kısımları atlayarak doğrudan içeriğe geçiyoruz. Bu adımları öğrenmek için daha önce ki NodeMCU yazılarımıza aşağıdaki bağlantılardan erişebilirsiniz.
Bu Yazının İçeriği;
göster
Devre Şeması
| OLED | NodeMCU |
|---|---|
| GND | GND |
| VCC | VCC |
| SCL | D1 |
| SDA | D2 |
Proje Görüntüleri
Bağlantıları ve kurulumu yaptıktan sonra, OLED ekran üzerindeki adresi, bir web tarayıcı yoluyla açtığınız zaman karşınıza gelen metin giriş yerine mesajını yazabilirsiniz.
Hazır Proje Dosyası
Birden fazla .h dosyasını birleştirmek ya da bir birine entegre etmek istemiyorsanız, kullanıma hazır olan bu proje dosyasını doğrudan indirebilirsiniz.
Proje Kodu – Ana Program
#pragma GCC diagnostic ignored "-Wwrite-strings"
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <Wire.h>
String form =
"<p>"
"<center>"
"<h1>Wifi Mesaj Uygulamasi</h1>"
"<img src='https://devreyakan.com/wp-content/uploads/2020/09/oNRdj.jpg'>"
"<form action='msg'><p>Mesaj yaz ... <input type='text' name='msg' size=50 autofocus> <input type='submit' value='Gonder'></form>"
"</center>";
long period;
#define SSID "WIFI-AG-ISMI" // Wifi İsmi
#define PASS "WIFI-SIFRESI" // Wifi Şifresi
ESP8266WebServer server(80); // HTTP sunucu portu 80
void setup(void)
{
//ESP.wdtDisable(); // hata ayıklayıcı kapat
Serial.begin(115200); // baudrate
Wire.begin(4, 5); // I2C pinleri SCL = D1 , SDA = D2
init_OLED(); // Oled başlat
reset_display();
WiFi.begin(SSID, PASS); // Wifi ağına bağlan
while (WiFi.status() != WL_CONNECTED) { // Bağlanmayı bekliyoruz
delay(500);
Serial.print(".");
SendChar('.');
}
// Sunucu için bitiş noktası
server.on("/", []()
{
server.send(200, "text/html", form);
});
server.on("/msg", handle_msg);
server.begin(); // Sunucuyu başlat
Serial.print("SSID : "); // Wifi adresi
Serial.println(SSID);
clear_display(); // Ekranı temizle
//sendStrXY("SSID:" , 0, 0); // Yazılacak satır
//sendStrXY(SSID, 0, 7);
// İp adres, yazdırma
char result[16];
sprintf(result, "%3d.%3d.%3d.%3d", WiFi.localIP()[0], WiFi.localIP()[1], WiFi.localIP()[2], WiFi.localIP()[3]);
sendStrXY("Sunucu Hazir:", 1, 0); // OLED satır 1
sendStrXY(result, 3, 0); // OLED satır 3
Serial.println("Sunucu Hazir: ");
Serial.println(WiFi.localIP()); // Serial ekrana yazdırma
Serial.println();
Serial.println(result);
sendStrXY("", 5, 0); // OLED satır 5
sendStrXY("", 6, 0); // OLED satır 6
sendStrXY("devreyakan wifi", 7, 0); // OLED satır 7
}
void loop(void) {
server.handleClient(); // checks for incoming messages
}
Proje Kodu – Ağ Yaması
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
/*
handles the messages coming from the webbrowser, restores a few special characters and
constructs the strings that can be sent to the oled display
*/
void handle_msg()
{
clear_display(); // clears oled
server.send(200, "text/html", form); // Send same page so they can send another msg
// Display msg on Oled
String msg = server.arg("msg");
Serial.println(msg);
String decodedMsg = msg;
// Restore special characters that are misformed to %char by the client browser
decodedMsg.replace("+", " ");
decodedMsg.replace("%21", "!");
decodedMsg.replace("%22", "");
decodedMsg.replace("%23", "#");
decodedMsg.replace("%24", "$");
decodedMsg.replace("%25", "%");
decodedMsg.replace("%26", "&");
decodedMsg.replace("%27", "'");
decodedMsg.replace("%28", "(");
decodedMsg.replace("%29", ")");
decodedMsg.replace("%2A", "*");
decodedMsg.replace("%2B", "+");
decodedMsg.replace("%2C", ",");
decodedMsg.replace("%2F", "/");
decodedMsg.replace("%3A", ":");
decodedMsg.replace("%3B", ";");
decodedMsg.replace("%3C", "<");
decodedMsg.replace("%3D", "=");
decodedMsg.replace("%3E", ">");
decodedMsg.replace("%3F", "?");
decodedMsg.replace("%40", "@");
//Serial.println(decodedMsg); // print original string to monitor
unsigned int lengte = decodedMsg.length(); // length of received message
for (int i = 0; i < lengte; i++) // prints up to 8 rows of 16 characters.
{
char c = decodedMsg[i];
Serial.print(c); //decodedMsg[i]);
if (i < 16) {
sendCharXY(c, 0, i);
}
else if (i < 32) {
sendCharXY(c, 1, i - 16);
}
else if (i < 48) {
sendCharXY(c, 2, i - 32);
}
else if (i < 64) {
sendCharXY(c, 3, i - 48);
}
else if (i < 80) {
sendCharXY(c, 4, i - 64);
}
else if (i < 96) {
sendCharXY(c, 5, i - 80);
}
else if (i < 112) {
sendCharXY(c, 6, i - 96);
}
else if (i < 128) {
sendCharXY(c, 7, i - 112);
}
}
//Serial.println(' '); // new line in monitor
}
Proje Kodu – OLED Ayarları
#include <Wire.h>
#include "font.h"
#define OLED_address 0x3c // all the OLED's I have seen have this address
//#define offset 0x00 // SDD1306 // offset=0 for SSD1306 controller
#define offset 0x02 // SH1106 // offset=2 for SH1106 controller
//==========================================================//
// Resets display depending on the actual mode.
static void reset_display(void)
{
displayOff();
clear_display();
displayOn();
}
//==========================================================//
// Turns display on.
void displayOn(void)
{
sendcommand(0xaf); //display on
}
//==========================================================//
// Turns display off.
void displayOff(void)
{
sendcommand(0xae); //display off
}
//==========================================================//
// Clears the display by sendind 0 to all the screen map.
static void clear_display(void)
{
unsigned char i, k;
for (k = 0; k < 8; k++)
{
setXY(k, 0);
{
for (i = 0; i < (128 + 2 * offset); i++) //locate all COL
{
SendChar(0); //clear all COL
//delay(10);
}
}
}
}
//==========================================================//
// Actually this sends a byte, not a char to draw in the display.
// Display's chars uses 8 byte font the small ones and 96 bytes
// for the big number font.
static void SendChar(unsigned char data)
{
Wire.beginTransmission(OLED_address); // begin transmitting
Wire.write(0x40);//data mode
Wire.write(data);
Wire.endTransmission(); // stop transmitting
}
//==========================================================//
// Prints a display char (not just a byte) in coordinates X Y,
// being multiples of 8. This means we have 16 COLS (0-15)
// and 8 ROWS (0-7).
static void sendCharXY(unsigned char data, int X, int Y)
{
setXY(X, Y);
Wire.beginTransmission(OLED_address); // begin transmitting
Wire.write(0x40);//data mode
for (int i = 0; i < 8; i++)
Wire.write(pgm_read_byte(myFont[data - 0x20] + i));
Wire.endTransmission(); // stop transmitting
}
//==========================================================//
// Used to send commands to the display.
static void sendcommand(unsigned char com)
{
Wire.beginTransmission(OLED_address); //begin transmitting
Wire.write(0x80); //command mode
Wire.write(com);
Wire.endTransmission(); // stop transmitting
}
//==========================================================//
// Set the cursor position in a 16 COL * 8 ROW map.
static void setXY(unsigned char row, unsigned char col)
{
sendcommand(0xb0 + row); //set page address
sendcommand(offset + (8 * col & 0x0f)); //set low col address
sendcommand(0x10 + ((8 * col >> 4) & 0x0f)); //set high col address
}
//==========================================================//
// Prints a string regardless the cursor position.
static void sendStr(unsigned char *string)
{
unsigned char i = 0;
while (*string)
{
for (i = 0; i < 8; i++)
{
SendChar(pgm_read_byte(myFont[*string - 0x20] + i));
}
*string++;
}
}
//==========================================================//
// Prints a string in coordinates X Y, being multiples of 8.
// This means we have 16 COLS (0-15) and 8 ROWS (0-7).
static void sendStrXY( char *string, int X, int Y)
{
setXY(X, Y);
unsigned char i = 0;
while (*string)
{
for (i = 0; i < 8; i++)
{
SendChar(pgm_read_byte(myFont[*string - 0x20] + i));
}
*string++;
}
}
//==========================================================//
// Inits oled and draws logo at startup
static void init_OLED(void)
{
sendcommand(0xae); //display off
sendcommand(0xa6); //Set Normal Display (default)
// Adafruit Init sequence for 128x64 OLED module
sendcommand(0xAE); //DISPLAYOFF
sendcommand(0xD5); //SETDISPLAYCLOCKDIV
sendcommand(0x80); // the suggested ratio 0x80
sendcommand(0xA8); //SSD1306_SETMULTIPLEX
sendcommand(0x3F);
sendcommand(0xD3); //SETDISPLAYOFFSET
sendcommand(0x0); //no offset
sendcommand(0x40 | 0x0); //SETSTARTLINE
sendcommand(0x8D); //CHARGEPUMP
sendcommand(0x14);
sendcommand(0x20); //MEMORYMODE
sendcommand(0x00); //0x0 act like ks0108
//sendcommand(0xA0 | 0x1); //SEGREMAP //Rotate screen 180 deg
sendcommand(0xA0);
//sendcommand(0xC8); //COMSCANDEC Rotate screen 180 Deg
sendcommand(0xC0);
sendcommand(0xDA); //0xDA
sendcommand(0x12); //COMSCANDEC
sendcommand(0x81); //SETCONTRAS
sendcommand(0xCF); //
sendcommand(0xd9); //SETPRECHARGE
sendcommand(0xF1);
sendcommand(0xDB); //SETVCOMDETECT
sendcommand(0x40);
sendcommand(0xA4); //DISPLAYALLON_RESUME
sendcommand(0xA6); //NORMALDISPLAY
clear_display();
sendcommand(0x2e); // stop scroll
//----------------------------REVERSE comments----------------------------//
sendcommand(0xa0); //seg re-map 0->127(default)
sendcommand(0xa1); //seg re-map 127->0
sendcommand(0xc8);
// delay(1000);
//----------------------------REVERSE comments----------------------------//
// sendcommand(0xa7); //Set Inverse Display
// sendcommand(0xae); //display off
sendcommand(0x20); //Set Memory Addressing Mode
sendcommand(0x00); //Set Memory Addressing Mode ab Horizontal addressing mode
// sendcommand(0x02); // Set Memory Addressing Mode ab Page addressing mode(RESET)
}
Proje Kodu – OLED Font
#include <pgmspace.h>
static const char myFont[][8] PROGMEM = {
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
{0x00,0x00,0x5F,0x00,0x00,0x00,0x00,0x00},
{0x00,0x00,0x07,0x00,0x07,0x00,0x00,0x00},
{0x00,0x14,0x7F,0x14,0x7F,0x14,0x00,0x00},
{0x00,0x24,0x2A,0x7F,0x2A,0x12,0x00,0x00},
{0x00,0x23,0x13,0x08,0x64,0x62,0x00,0x00},
{0x00,0x36,0x49,0x55,0x22,0x50,0x00,0x00},
{0x00,0x00,0x05,0x03,0x00,0x00,0x00,0x00},
{0x00,0x1C,0x22,0x41,0x00,0x00,0x00,0x00},
{0x00,0x41,0x22,0x1C,0x00,0x00,0x00,0x00},
{0x00,0x08,0x2A,0x1C,0x2A,0x08,0x00,0x00},
{0x00,0x08,0x08,0x3E,0x08,0x08,0x00,0x00},
{0x00,0xA0,0x60,0x00,0x00,0x00,0x00,0x00},
{0x00,0x08,0x08,0x08,0x08,0x08,0x00,0x00},
{0x00,0x60,0x60,0x00,0x00,0x00,0x00,0x00},
{0x00,0x20,0x10,0x08,0x04,0x02,0x00,0x00},
{0x00,0x3E,0x51,0x49,0x45,0x3E,0x00,0x00},
{0x00,0x00,0x42,0x7F,0x40,0x00,0x00,0x00},
{0x00,0x62,0x51,0x49,0x49,0x46,0x00,0x00},
{0x00,0x22,0x41,0x49,0x49,0x36,0x00,0x00},
{0x00,0x18,0x14,0x12,0x7F,0x10,0x00,0x00},
{0x00,0x27,0x45,0x45,0x45,0x39,0x00,0x00},
{0x00,0x3C,0x4A,0x49,0x49,0x30,0x00,0x00},
{0x00,0x01,0x71,0x09,0x05,0x03,0x00,0x00},
{0x00,0x36,0x49,0x49,0x49,0x36,0x00,0x00},
{0x00,0x06,0x49,0x49,0x29,0x1E,0x00,0x00},
{0x00,0x00,0x36,0x36,0x00,0x00,0x00,0x00},
{0x00,0x00,0xAC,0x6C,0x00,0x00,0x00,0x00},
{0x00,0x08,0x14,0x22,0x41,0x00,0x00,0x00},
{0x00,0x14,0x14,0x14,0x14,0x14,0x00,0x00},
{0x00,0x41,0x22,0x14,0x08,0x00,0x00,0x00},
{0x00,0x02,0x01,0x51,0x09,0x06,0x00,0x00},
{0x00,0x32,0x49,0x79,0x41,0x3E,0x00,0x00},
{0x00,0x7E,0x09,0x09,0x09,0x7E,0x00,0x00},
{0x00,0x7F,0x49,0x49,0x49,0x36,0x00,0x00},
{0x00,0x3E,0x41,0x41,0x41,0x22,0x00,0x00},
{0x00,0x7F,0x41,0x41,0x22,0x1C,0x00,0x00},
{0x00,0x7F,0x49,0x49,0x49,0x41,0x00,0x00},
{0x00,0x7F,0x09,0x09,0x09,0x01,0x00,0x00},
{0x00,0x3E,0x41,0x41,0x51,0x72,0x00,0x00},
{0x00,0x7F,0x08,0x08,0x08,0x7F,0x00,0x00},
{0x00,0x41,0x7F,0x41,0x00,0x00,0x00,0x00},
{0x00,0x20,0x40,0x41,0x3F,0x01,0x00,0x00},
{0x00,0x7F,0x08,0x14,0x22,0x41,0x00,0x00},
{0x00,0x7F,0x40,0x40,0x40,0x40,0x00,0x00},
{0x00,0x7F,0x02,0x0C,0x02,0x7F,0x00,0x00},
{0x00,0x7F,0x04,0x08,0x10,0x7F,0x00,0x00},
{0x00,0x3E,0x41,0x41,0x41,0x3E,0x00,0x00},
{0x00,0x7F,0x09,0x09,0x09,0x06,0x00,0x00},
{0x00,0x3E,0x41,0x51,0x21,0x5E,0x00,0x00},
{0x00,0x7F,0x09,0x19,0x29,0x46,0x00,0x00},
{0x00,0x26,0x49,0x49,0x49,0x32,0x00,0x00},
{0x00,0x01,0x01,0x7F,0x01,0x01,0x00,0x00},
{0x00,0x3F,0x40,0x40,0x40,0x3F,0x00,0x00},
{0x00,0x1F,0x20,0x40,0x20,0x1F,0x00,0x00},
{0x00,0x3F,0x40,0x38,0x40,0x3F,0x00,0x00},
{0x00,0x63,0x14,0x08,0x14,0x63,0x00,0x00},
{0x00,0x03,0x04,0x78,0x04,0x03,0x00,0x00},
{0x00,0x61,0x51,0x49,0x45,0x43,0x00,0x00},
{0x00,0x7F,0x41,0x41,0x00,0x00,0x00,0x00},
{0x00,0x02,0x04,0x08,0x10,0x20,0x00,0x00},
{0x00,0x41,0x41,0x7F,0x00,0x00,0x00,0x00},
{0x00,0x04,0x02,0x01,0x02,0x04,0x00,0x00},
{0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00},
{0x00,0x01,0x02,0x04,0x00,0x00,0x00,0x00},
{0x00,0x20,0x54,0x54,0x54,0x78,0x00,0x00},
{0x00,0x7F,0x48,0x44,0x44,0x38,0x00,0x00},
{0x00,0x38,0x44,0x44,0x28,0x00,0x00,0x00},
{0x00,0x38,0x44,0x44,0x48,0x7F,0x00,0x00},
{0x00,0x38,0x54,0x54,0x54,0x18,0x00,0x00},
{0x00,0x08,0x7E,0x09,0x02,0x00,0x00,0x00},
{0x00,0x18,0xA4,0xA4,0xA4,0x7C,0x00,0x00},
{0x00,0x7F,0x08,0x04,0x04,0x78,0x00,0x00},
{0x00,0x00,0x7D,0x00,0x00,0x00,0x00,0x00},
{0x00,0x80,0x84,0x7D,0x00,0x00,0x00,0x00},
{0x00,0x7F,0x10,0x28,0x44,0x00,0x00,0x00},
{0x00,0x41,0x7F,0x40,0x00,0x00,0x00,0x00},
{0x00,0x7C,0x04,0x18,0x04,0x78,0x00,0x00},
{0x00,0x7C,0x08,0x04,0x7C,0x00,0x00,0x00},
{0x00,0x38,0x44,0x44,0x38,0x00,0x00,0x00},
{0x00,0xFC,0x24,0x24,0x18,0x00,0x00,0x00},
{0x00,0x18,0x24,0x24,0xFC,0x00,0x00,0x00},
{0x00,0x00,0x7C,0x08,0x04,0x00,0x00,0x00},
{0x00,0x48,0x54,0x54,0x24,0x00,0x00,0x00},
{0x00,0x04,0x7F,0x44,0x00,0x00,0x00,0x00},
{0x00,0x3C,0x40,0x40,0x7C,0x00,0x00,0x00},
{0x00,0x1C,0x20,0x40,0x20,0x1C,0x00,0x00},
{0x00,0x3C,0x40,0x30,0x40,0x3C,0x00,0x00},
{0x00,0x44,0x28,0x10,0x28,0x44,0x00,0x00},
{0x00,0x1C,0xA0,0xA0,0x7C,0x00,0x00,0x00},
{0x00,0x44,0x64,0x54,0x4C,0x44,0x00,0x00},
{0x00,0x08,0x36,0x41,0x00,0x00,0x00,0x00},
{0x00,0x00,0x7F,0x00,0x00,0x00,0x00,0x00},
{0x00,0x41,0x36,0x08,0x00,0x00,0x00,0x00},
{0x00,0x02,0x01,0x01,0x02,0x01,0x00,0x00},
{0x00,0x02,0x05,0x05,0x02,0x00,0x00,0x00}
};