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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SunFounder IIC I2C TWI 1602 Serial LCD Module Display Compatible with Arduino R3 Mega 2560 16x2

Product ID: 531797983

Details

Brand
SunFounder
Model Name
IIC I2C TWI
Memory Storage Capacity
1 TB
Connectivity Technology
I2C
Wireless Communication Standard
802.11b

⚡Low power consumption - efficient operation

🔗I2C serial interface - minimal wiring

🔢16x2 character display - clear data visualization

SAR 138

Duties & taxes included

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Description

🔗 Elevate your Arduino projects with sleek, minimal wiring and maximum impact!

COMPACT EFFICIENT - Saves IO ports and power without compromising on display quality
TRUSTED PERFORMANCE - Highly rated with 4.5 stars and proven reliability for professional-grade projects
CRYSTAL CLEAR DISPLAY - 16x2 characters with high contrast for effortless readability in any project
PLUG PLAY SIMPLICITY - Easy wiring and compatibility with Arduino R3 Mega 2560 accelerates your build time
STREAMLINED CONNECTIVITY - Only 2 wires (SDA & SCL) free up your Arduino pins for more innovation

The SunFounder IIC I2C TWI 1602 Serial LCD Module is a 16x2 character display designed for Arduino R3 Mega 2560 compatibility. Featuring an I2C interface, it drastically reduces wiring complexity by using only two bidirectional data lines (SDA and SCL), freeing up valuable IO pins. This module offers high contrast readability, low power consumption, and easy integration, making it a top choice for efficient, professional-grade embedded display solutions.

Specifications

ASIN	B019K5X53O
Best Sellers Rank	#329,465 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #158 in LCD Character Modules
Brand	SunFounder
Brand Name	SunFounder
Compatible Devices	Arduino R3 Mega 2560
Connectivity Technology	I2C
Customer Reviews	4.5 out of 5 stars 459 Reviews
Importer Contact Information	ATM RETAIL 1st Floor Beside P and T Building Lakdi Ka Pul Hyderabad Telangana 500004
Manufacturer	SunFounder
Manufacturer Part Number	TS0351
Memory Storage Capacity	1 TB
Model Name	IIC I2C TWI 1602
Model Number	TS0351
Network Connectivity Technology	I2C
Processor Count	1
UPC	701715367685
Wireless Communication Standard	802.11b
Wireless Compability	802.11b

Reviews

J**4

Parfait !

Afficheur de qualité, la lisibilité des caractères est bonne ainsi que le contraste. La qualité des soudures est excellente. Je conseille ce produit

15.09.2016

B**O

Funciona perfecto y se ve bien

Funciona perfecto y fácil de implementar.

5.03.2026

W**D

Good Display for Projects

Worked perfectly for my esp32 project, shipped quickly, and I have nothing bad to say about the product!

28.04.2026

F**O

Improved Version of the LCD 1602

An improvement of the previous LCD 1602 I had. This one comes with only 4 connector pins from the I2C module. The I2C module has also been pre-soldered already to the LCD. Great buy for me.

14.12.2025

A**O

funziona bene

Accoppiato ad Arduino. Buon contrasto e buona illuminazione.

9.10.2019

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