LCDDisplay

Introduction

The ESP8266 module can be used to control an I2C LCD Display.

Hardware

Connect the LCD Display to the I2C interface. This display works with 5 volt VCC, but the I2C connections should be "floating". The 2004 display from "Funduino" that we used in our testlab could be connected without levelshifters.

Connections

WARNING: Some LCD Modules might have pullup resistors to 5 volts VCC. In that case a levelshifter should be used

 LCD 	 	ESP-01
 GND 	 	GND
 VCC    	-
 SDA		GPIO 0
 SCL		GPIO 2

Software

ESP Easy

Use the device tab on the ESP Easy webinterface and create a new task by editing one of the available tasks. Select "LCD Display" from the dropdown box.

Enter template texts into lines 1 to 4. Plain text will be shown on the display exactly as entered. If you want to show a value, enclose <task name> and <value name> between brackets, separated by a hashtag.

So if you have a dallas sensor running, with taskname "Dallas", to get the temperature value, use this:

 [Dallas#Temperature]

Check this sample on how to get it done:

(The IDX field will be stuffed with '1', because it's needs a value. But nothing will be send with this device)

ESP Connexio

Command:

LCDI2CWrite <line>,<column position>, <data command>, <data option>

Parameter:	Description:	Range:	Comments:
Line	Linenumber	1-2 (of 1-4)
Column	Column position	1-16 (1-20)
data command		Message, Clock, IP, PortInput, Variable, Event
data option	In case of Message: label id of text to be shown	Message:1-20

Sample

LCDWrite 1,1,Message,1