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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Description

📟 Minimal pins, maximum impact—upgrade your DIY display game!

CUSTOMIZABLE DISPLAY - Built-in potentiometer lets you effortlessly adjust backlight and contrast to fit any environment or mood.
COMPACT LIGHTWEIGHT - Slim 4.9 x 1.7 x 0.4 inch design weighing just 1.41 ounces—perfect for sleek, space-conscious projects.
RELIABLE FUTURE PROOF - Powered by a stable 5V supply and backed by SunFounder’s trusted ARM-based processor for consistent performance.
STREAMLINED CONNECTIVITY - Only 4 pins needed—VCC, GND, SDA, SCL—freeing up your I/O ports for more innovation.
PLUG PLAY COMPATIBILITY - Seamlessly integrates with Arduino and Raspberry Pi using the provided I2C LCD1602 library for instant coding ease.

The SunFounder IIC/I2C/TWI LCD1602 Display Module is a compact, 16x2 character LCD designed for easy integration with Arduino and Raspberry Pi. Utilizing only four pins and supporting the I2C protocol, it minimizes wiring complexity while offering adjustable backlight and contrast via a built-in potentiometer. Powered by 5V and featuring a reliable ARM processor, this lightweight module is ideal for professional-grade prototyping and embedded projects.

Specifications

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

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