It it possible to change the address of the lcd to have multiple lcd on the same bus?

To further expand on Wes' answer (which is excellent!), you can have up to eight (8) on the same bus, per the chip datasheets. The chips have a portion of the address hard-code (which cannot be changed) and the three remaining address lines (A0, A1, and A2) can be jumpered to ground to set seven (7) other addresses - the 8th being no jumpers. IF you happen to get one with an 8574 chip and another with 8574A or 8574T, then you could potentially have up to 16 modules on the same bus as the A and T versions use a different hard-coded address than the 8574.

Has anyone run this display on 3.3 volts successfully? I'd like to use it on an 8266-12E to display the ip address.

It works on 3.3V, but just barely: it's unusably dim. I changed the supply voltage to 5V and was able to successfully drive it with 3.3V-level I2C signals, although the PCF8574 data sheet says that the minimum Vih level is 0.7 * Vcc = 3.5V. My scope says that the signals are rising to about 3.8V, so there must be some kind of pull-up to 5V on the I2C backpack board. I don't want to rely on that, so for my final design I'll use a PCA9306 I2C level shifter.

Do these come with an I2C backpack? I just ordered some of these and they came with no backpack in the package.

There are several product options on the page, some have I2C, some don't. If you chose one that has I2C, it should come with an I2C backpack.

Does this work for the old raspberry pis that have a 26 pin gpio?

This module uses an i2c serial interface rather than discrete gpio pins. If your rpi has an i2c, it should work.

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📟 Elevate your Arduino projects with sleek, smart display tech!

MINIMAL PIN USAGE - Frees up your Arduino ports with just 4 connections—VCC, GND, SDA, SCL.
WIDE COMPATIBILITY - Works flawlessly with Arduino Uno R3, Mega, and other I2C-enabled boards.
COMPACT EFFICIENT - 16x2 character display that maximizes info density without sacrificing space.
CUSTOMIZABLE DISPLAY - Adjust backlight and contrast effortlessly via built-in potentiometer for perfect visibility.
SEAMLESS I 2 C INTEGRATION - Plug-and-play compatibility with Arduino’s I2C protocol for hassle-free coding.

The SunFounder IIC I2C TWI 1602 Serial LCD Module is a compact 16x2 character display designed for Arduino boards, utilizing only four pins thanks to I2C protocol support. It features a built-in potentiometer for easy backlight and contrast adjustment, runs on a 5V power supply, and offers seamless integration to enhance your project’s interface without compromising controller I/O availability.

Reviews

T**K

Great premade product

I ordered this to hook up with an Arduino. The I2C bus was very attractive as only four wires needed to the display rather than twelve. Very easy to get working.And I was not expecting the bus to be presoldered to the display so an added bonus!Seems a very good product.

4.09.2018

B**N

it's ok

Works just fine. You need the right software library and you have to initialise the device before outputting to it otherwise you get rubbish displayed.

29.10.2016

R**F

Five Stars

great little display

30.07.2016

A**R

Four Stars

arrived on time, worked perfectly.

2.08.2016

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Standing screen display size	1 Centimeters
Screen Resolution	2560 x 1600 pixels
Max Screen Resolution	2560 x 1600 pixels
Processor	210
Card Description	Dedicated
Wireless Type	802.11b
Brand	SunFounder
Series	2004 20x4 LCD Module
Item model number	TS0351
Operating System	ios
Item Weight	1.41 ounces
Product Dimensions	4.9 x 1.7 x 0.4 inches
Item Dimensions LxWxH	4.9 x 1.7 x 0.4 inches
Color	16x2 I2C LCD
Processor Brand	ARM
Number of Processors	1
Voltage	5 Volts
Manufacturer	SunFounder
ASIN	B019K5X53O
Is Discontinued By Manufacturer	No
Date First Available	April 13, 2016

SunFounder IIC I2C TWI 1602 Serial LCD Module Display compatible with Arduino R3 Mega 16x2

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