ESP 8266 I2C LCD Example

You will need the USB Driver for you're ESP 8266 for Windows 7 or w.e you use.

Library

arduinolibraries.info/libraries/hd44780

and

github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library


Example Code (Detect I2C of LCD Board Address)

Code:

#include <Wire.h>

// I2C Scanner will detect your i2c address mines 0x38
// Written by Nick Gammon
// Date: 20th April 2011


void setup() {
  Serial.begin (115200);

  // Leonardo: wait for serial port to connect
  while (!Serial)
    {
    }

  Serial.println ();
  Serial.println ("I2C scanner. Scanning ...");
  byte count = 0;
 
  Wire.begin();
  for (byte i = 8; i < 120; i++)
  {
    Wire.beginTransmission (i);
    if (Wire.endTransmission () == 0)
      {
      Serial.print ("Found address: ");
      Serial.print (i, DEC);
      Serial.print (" (0x");
      Serial.print (i, HEX);
      Serial.println (")");
      count++;
      delay (1);  // maybe unneeded?
      } // end of good response
  } // end of for loop
  Serial.println ("Done.");
  Serial.print ("Found ");
  Serial.print (count, DEC);
  Serial.println (" device(s).");
}  // end of setup

void loop() {}

Example Display Code

Code:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// http://www.arduinolibraries.info/libraries/hd44780

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x38, 16, 2);

void setup()
{
    // initialize the LCD
    lcd.begin();

    // Turn on the blacklight and print a message.
    lcd.backlight();
    lcd.print("Subscribe 2 JNET!");
}

void loop()
{
    // Do nothing here...
}

Pins Used:

D1 (ESP NODE MCU 8266) = SCL I2C
D2 (ESP NODE MCU 8266) = SDA I2C

My address is 0x38 as I have bridged A0 & A1 & A2.

To use scanner make sure com port and serial broad rate is set correctly then reset the esp and look for address, then if you need it you have it, also set chars, mines 16, 2.

For USB Drivers search google

encrypted.google.com/search?q=usb+esp8266+windows+7+driver&oq=usb+esp8266+windows+7+driver&gs_l=psy-ab.3...92654.99132.0.99619.6.6.0.0.0.0.162.788.1j5.6.0....0...1.1.64.psy-ab..0.2.314...0i13k1j33i21k1.bleAZENtAec

Also turns out esp 8266 does have a 5v pin but my gsm module needs more amps than my usb 3 can provide, (2amp) usb3 only has 1.5 amps.

Serial To I2C LCD Example

Code:

/**
 * Displays text sent over the serial port (e.g. from the Serial Monitor) on
 * an attached LCD.
 */
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x38, 16, 2);

void setup()
{
    lcd.begin();
    lcd.backlight();
 
    // Initialize the serial port at a speed of 9600 baud
    Serial.begin(9600);
}

void loop()
{
    // If characters arrived over the serial port...
    if (Serial.available()) {
        // Wait a bit for the entire message to arrive
        delay(100);
        // Clear the screen
        lcd.clear();

        // Write all characters received with the serial port to the LCD.
        while (Serial.available() > 0) {
            lcd.write(Serial.read());
        }
    }
}


Scrolling LCD I2C

1 Line Static
1 Line Scroll

Code:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// http://www.arduinolibraries.info/libraries/hd44780

// Set the LCD address to 0x27 (Default) Or 0x38 for bridged i2c for a 16 chars and 2 line display

// initialize the library with the numbers of the interface pins
LiquidCrystal_I2C lcd(0x38, 16, 2);

//  lcd.print("Subscribe 2 JNET!");
String txtsc,txtnosc;
void setup(){
  txtnosc="Subscribe JNET";
  txtsc=" Scrolling Text Here.. jnet.forumotion.com";
  lcd.begin();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(txtnosc);
}

void loop(){
          lcd.setCursor(0,1);
          txtsc=ScrollTxt(txtsc);
          lcd.print(txtsc);
          delay(200);
}

String ScrollTxt(String txt){
return txt.substring(1,txt.length()) + txt.substring(0,1);
}

More examples:

arduino.cc/en/Tutorial/LiquidCrystalScroll

Scrolling Example