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 LCD1602 Display Module Compatible with Arduino and Raspberry Pi

Product ID: 98403555

Details

Brand
SunFounder
CPU Model
210
Memory Storage Capacity
1 TB
Model Name
2004 20x4 LCD
Ram Memory Installed Size
1 MB

⚡5V power supply

📟I2C protocol support

🔌4-pin minimal wiring

155 kr

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Description

📟 Elevate your projects with sleek, smart display tech—don’t get left in the dark!

ROBUST I 2 C PROTOCOL - Reliable serial communication for smooth, lag-free data display.
CUSTOMIZABLE DISPLAY - Adjust backlight and contrast effortlessly with built-in potentiometer.
READY FOR MAKERS 14 - Perfect for young pros and seasoned developers alike—start building today.
STREAMLINED CONNECTIVITY - Only 4 pins needed—free up your I/O ports for more innovation.
PLUG PLAY COMPATIBILITY - Seamlessly integrates with Arduino and Raspberry Pi ecosystems.

The SunFounder IIC/I2C/TWI LCD1602 Display Module offers a compact, easy-to-use 16x2 character LCD with minimal wiring requirements, supporting the I2C protocol for efficient communication. Compatible with Arduino and Raspberry Pi, it features adjustable backlight and contrast, powered by a 5V supply, making it an ideal choice for hobbyists and professionals seeking reliable, customizable display solutions.

Specifications

ASIN	B019K5X53O
Best Sellers Rank	#4 in Desktop Barebones #330 in Single Board Computers (Computers & Accessories)
Brand	SunFounder
Built-In Media	I2C LCD1602
CPU Model	210
Compatible Devices	Arduino, Raspberry Pi
Connectivity Technology	I2C
Customer Reviews	4.6 4.6 out of 5 stars (487)
Item Dimensions L x W x H	4.9"L x 1.7"W x 0.4"H
Manufacturer	SunFounder
Memory Storage Capacity	1 TB
Mfr Part Number	TS0351
Model Name	2004 20x4 LCD Module
Model Number	TS0351
Number of Items	1
Number of Packs	1
Operating System	ios
Processor Brand	ARM
Processor Count	1
RAM Memory Installed	1 MB
RAM Memory Technology	LPDDR3
UPC	701715367685
Unit Count	1 Count
Warranty Description	1 Year Guarantee
Wireless Compability	802.11b

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155 kr

Duties & taxes included

In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Denmark.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Great experience from order to delivery. Highly recommended!

1 week ago

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2 weeks ago

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