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co sto
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Create ESP_Messenger_v1.0
Modified it for using OLED display with SDD1306 and with SH1106 controller added: on startup showing local IP of ESP-server
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‎ESP_Messenger_v1.0

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/*
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Version 1.0 supports OLED display's with either SDD1306 or with SH1106 controller
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*/
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#include <ESP8266WiFi.h>
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#include <ESP8266WebServer.h>
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#include <Wire.h>
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#include "font.h"
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//#define offset 0x00 // SDD1306 // offset=0 for SSD1306 controller
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#define offset 0x02 // SH1106 // offset=2 for SH1106 controller
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#define OLED_address 0x3c // all the OLED's I have seen have this address
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#define SSID "........" // insert your SSID
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#define PASS "........" // insert your password
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// ******************* String form to sent to the client-browser ************************************
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String form =
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"<p>"
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"<center>"
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"<h1>Talk to me :-)</h1>"
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"<img src='http://i.imgur.com/qu8lDEu.jpg'>"
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"<form action='msg'><p>Wassup? <input type='text' name='msg' size=50 autofocus> <input type='submit' value='Submit'></form>"
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"</center>";
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ESP8266WebServer server(80); // HTTP server will listen at port 80
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long period;
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/*
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handles the messages coming from the webbrowser, restores a few special characters and
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constructs the strings that can be sent to the oled display
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*/
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void handle_msg() {
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clear_display(); // clears oled
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server.send(200, "text/html", form); // Send same page so they can send another msg
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// Display msg on Oled
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String msg = server.arg("msg");
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Serial.println(msg);
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String decodedMsg = msg;
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// Restore special characters that are misformed to %char by the client browser
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decodedMsg.replace("+", " ");
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decodedMsg.replace("%21", "!");
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decodedMsg.replace("%22", "");
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decodedMsg.replace("%23", "#");
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decodedMsg.replace("%24", "$");
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decodedMsg.replace("%25", "%");
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decodedMsg.replace("%26", "&");
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decodedMsg.replace("%27", "'");
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decodedMsg.replace("%28", "(");
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decodedMsg.replace("%29", ")");
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decodedMsg.replace("%2A", "*");
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decodedMsg.replace("%2B", "+");
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decodedMsg.replace("%2C", ",");
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decodedMsg.replace("%2F", "/");
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decodedMsg.replace("%3A", ":");
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decodedMsg.replace("%3B", ";");
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decodedMsg.replace("%3C", "<");
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decodedMsg.replace("%3D", "=");
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decodedMsg.replace("%3E", ">");
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decodedMsg.replace("%3F", "?");
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decodedMsg.replace("%40", "@");
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//Serial.println(decodedMsg); // print original string to monitor
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unsigned int lengte = decodedMsg.length(); // length of received message
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for (int i=0;i<lengte;i++) // prints up to 8 rows of 16 characters.
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{
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char c = decodedMsg[i];
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Serial.print(c); //decodedMsg[i]);
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if (i<16) {sendCharXY(c,0,i);}
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else if (i<32) {sendCharXY(c,1,i-16);}
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else if (i<48) {sendCharXY(c,2,i-32);}
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else if (i<64) {sendCharXY(c,3,i-48);}
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else if (i<80) {sendCharXY(c,4,i-64);}
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else if (i<96) {sendCharXY(c,5,i-80);}
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else if (i<112) {sendCharXY(c,6,i-96);}
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else if (i<128) {sendCharXY(c,7,i-112);}
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}
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//Serial.println(' '); // new line in monitor
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}
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void setup(void) {
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//ESP.wdtDisable(); // used to debug, disable wachdog timer,
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Serial.begin(115200); // full speed to monitor
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Wire.begin(0,2); // Initialize I2C and OLED Display
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init_OLED(); //
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reset_display();
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WiFi.begin(SSID, PASS); // Connect to WiFi network
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while (WiFi.status() != WL_CONNECTED) { // Wait for connection
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delay(500);
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Serial.print(".");
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}
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// Set up the endpoints for HTTP server, Endpoints can be written as inline functions:
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server.on("/", []() {
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server.send(200, "text/html", form);
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});
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server.on("/msg", handle_msg); // And as regular external functions:
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server.begin(); // Start the server
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clear_display();
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Serial.print("SSID : "); // prints SSID in monitor
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Serial.println(SSID); // to monitor
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sendStrXY("SSID :" ,0,0); sendStrXY(SSID,0,7); // prints SSID on OLED
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char result[16];
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sprintf(result, "%3d.%3d.%3d.%3d", WiFi.localIP()[0], WiFi.localIP()[1], WiFi.localIP()[2], WiFi.localIP()[3]);
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Serial.println();Serial.println(result);
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sendStrXY(result,2,0);
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Serial.println("WebServer ready! ");
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sendStrXY("WebServer ready!",4,0); // OLED first message
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Serial.println(WiFi.localIP()); // Serial monitor prints localIP
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Serial.print(analogRead(A0));
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int test = 13;
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pinMode(test,OUTPUT);
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digitalWrite(test,HIGH);
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delay(1000);
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digitalWrite(test,LOW);
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}
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void loop(void) {
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server.handleClient(); // checks for incoming messages
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}
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//==========================================================//
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// Resets display depending on the actual mode.
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static void reset_display(void)
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{
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displayOff();
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clear_display();
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displayOn();
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}
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//==========================================================//
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// Turns display on.
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void displayOn(void)
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{
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sendcommand(0xaf); //display on
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}
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//==========================================================//
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// Turns display off.
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void displayOff(void)
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{
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sendcommand(0xae); //display off
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}
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//==========================================================//
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// Clears the display by sendind 0 to all the screen map.
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static void clear_display(void)
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{
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unsigned char i,k;
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for(k=0;k<8;k++)
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{
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setXY(k,0);
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{
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for(i=0;i<(128 + 2 * offset);i++) //locate all COL
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{
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SendChar(0); //clear all COL
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//delay(10);
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}
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}
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}
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}
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//==========================================================//
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// Actually this sends a byte, not a char to draw in the display.
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// Display's chars uses 8 byte font the small ones and 96 bytes
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// for the big number font.
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static void SendChar(unsigned char data)
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{
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//if (interrupt && !doing_menu) return; // Stop printing only if interrupt is call but not in button functions
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Wire.beginTransmission(OLED_address); // begin transmitting
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Wire.write(0x40);//data mode
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Wire.write(data);
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Wire.endTransmission(); // stop transmitting
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}
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//==========================================================//
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// Prints a display char (not just a byte) in coordinates X Y,
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// being multiples of 8. This means we have 16 COLS (0-15)
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// and 8 ROWS (0-7).
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static void sendCharXY(unsigned char data, int X, int Y)
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{
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setXY(X, Y);
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Wire.beginTransmission(OLED_address); // begin transmitting
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Wire.write(0x40);//data mode
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for(int i=0;i<8;i++)
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Wire.write(pgm_read_byte(myFont[data-0x20]+i));
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Wire.endTransmission(); // stop transmitting
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}
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//==========================================================//
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// Used to send commands to the display.
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static void sendcommand(unsigned char com)
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{
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Wire.beginTransmission(OLED_address); //begin transmitting
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Wire.write(0x80); //command mode
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Wire.write(com);
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Wire.endTransmission(); // stop transmitting
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}
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//==========================================================//
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// Set the cursor position in a 16 COL * 8 ROW map.
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static void setXY(unsigned char row,unsigned char col)
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{
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sendcommand(0xb0+row); //set page address
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sendcommand(offset+(8*col&0x0f)); //set low col address
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sendcommand(0x10+((8*col>>4)&0x0f)); //set high col address
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}
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//==========================================================//
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// Prints a string regardless the cursor position.
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static void sendStr(unsigned char *string)
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{
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unsigned char i=0;
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while(*string)
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{
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for(i=0;i<8;i++)
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{
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SendChar(pgm_read_byte(myFont[*string-0x20]+i));
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}
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*string++;
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}
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}
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//==========================================================//
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// Prints a string in coordinates X Y, being multiples of 8.
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// This means we have 16 COLS (0-15) and 8 ROWS (0-7).
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static void sendStrXY( char *string, int X, int Y)
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{
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setXY(X,Y);
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unsigned char i=0;
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while(*string)
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{
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for(i=0;i<8;i++)
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{
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SendChar(pgm_read_byte(myFont[*string-0x20]+i));
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}
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*string++;
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}
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}
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//==========================================================//
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// Inits oled and draws logo at startup
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static void init_OLED(void)
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{
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sendcommand(0xae); //display off
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sendcommand(0xa6); //Set Normal Display (default)
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// Adafruit Init sequence for 128x64 OLED module
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sendcommand(0xAE); //DISPLAYOFF
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sendcommand(0xD5); //SETDISPLAYCLOCKDIV
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sendcommand(0x80); // the suggested ratio 0x80
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sendcommand(0xA8); //SSD1306_SETMULTIPLEX
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sendcommand(0x3F);
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sendcommand(0xD3); //SETDISPLAYOFFSET
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sendcommand(0x0); //no offset
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sendcommand(0x40 | 0x0); //SETSTARTLINE
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sendcommand(0x8D); //CHARGEPUMP
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sendcommand(0x14);
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sendcommand(0x20); //MEMORYMODE
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sendcommand(0x00); //0x0 act like ks0108
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//sendcommand(0xA0 | 0x1); //SEGREMAP //Rotate screen 180 deg
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sendcommand(0xA0);
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//sendcommand(0xC8); //COMSCANDEC Rotate screen 180 Deg
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sendcommand(0xC0);
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sendcommand(0xDA); //0xDA
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sendcommand(0x12); //COMSCANDEC
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sendcommand(0x81); //SETCONTRAS
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sendcommand(0xCF); //
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sendcommand(0xd9); //SETPRECHARGE
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sendcommand(0xF1);
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sendcommand(0xDB); //SETVCOMDETECT
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sendcommand(0x40);
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sendcommand(0xA4); //DISPLAYALLON_RESUME
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sendcommand(0xA6); //NORMALDISPLAY
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clear_display();
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sendcommand(0x2e); // stop scroll
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//----------------------------REVERSE comments----------------------------//
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sendcommand(0xa0); //seg re-map 0->127(default)
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sendcommand(0xa1); //seg re-map 127->0
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sendcommand(0xc8);
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delay(1000);
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//----------------------------REVERSE comments----------------------------//
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// sendcommand(0xa7); //Set Inverse Display
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// sendcommand(0xae); //display off
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sendcommand(0x20); //Set Memory Addressing Mode
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sendcommand(0x00); //Set Memory Addressing Mode ab Horizontal addressing mode
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// sendcommand(0x02); // Set Memory Addressing Mode ab Page addressing mode(RESET)
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}
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