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 Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004)

SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004)

Product ID: 33978284

Details

Brand
SunFounder
CPU Manufacturer
Atmel
Connectivity Technology
I2C
Model Name
8541582407
Operating System
Linux

🔗I2C interface, 2 I/O pins only

🔢20x4 character display

🔧Adjustable contrast potentiometer

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Description

🚀 Elevate your Arduino projects with sleek, smart display power!

CRYSTAL CLEAR 20 X 4 DISPLAY - Showcase 80 characters in 4 vivid rows for ultimate project clarity.
EFFORTLESS CONTRAST CONTROL - Fine-tune your screen visibility with a simple back potentiometer twist.
CUSTOMIZABLE BACKLIGHT OPTIONS - Choose to glow or go dark by unplugging the jumper cap—your project, your vibe.
SEAMLESS ARDUINO COMPATIBILITY - Plug & play with Arduino R3, MEGA, and Uno boards for instant prototyping.
MINIMAL PIN USAGE MAXIMUM IMPACT - Leverage I2C tech to free up Arduino pins—just 2 I/O ports needed.

The SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield is a versatile, Arduino-compatible display featuring a 20x4 character screen, adjustable contrast, and an efficient I2C interface that uses only two I/O pins. Perfect for professionals and makers aiming to add vivid, customizable visual feedback to their electronics projects with minimal wiring complexity.

Specifications

ASIN	B01GPUMP9C
Best Sellers Rank	#51,761 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in LCD Character Modules
Brand	SunFounder
CPU Manufacturer	Atmel
Compatible Devices	Arduino R3, Arduino MEGA, Arduino Uno, Arduino Uno R3 USB Microcontroller, Mega 2560
Connectivity Technology	I2C
Customer Reviews	4.6 out of 5 stars 426 Reviews
Item Weight	86.4 g
Manufacturer	SunFounder
Mfr Part Number	I2C LCD
Model Name	8541582407
Model Number	8541582407
Number of Items	1
Number of Packs	1
Operating System	Linux
Processor Brand	Atmel
Processor Count	1
RAM Memory Technology	LPDDR
Total Usb Ports	4
UPC	701715368224 743447130144
Unit Count	1 Count
Warranty Description	1 Year Guarantee

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AED 80

Duties & taxes included

In stock

Sold byAmazon UAEDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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TrustScore 4.5 | 7,300+ reviews

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