GeeekPi 2-Pack I2C 1602 LCD Display Module 16X2 Character Serial Blue Backlight LCD Module for Raspberry Pi Arduino STM32 DIY Maker Project Nanopi BPI Tinker board Electrical IoT Internet of Things

I am using this for a little project I'm working on. No complaints at all, but here are a couple of things that might be good to know: 1. The LiquidCrystal_I2C library available from within the Arduino app works fine. You don't need any of the variant versions. Just go into the Library Manager and search for LiquidCrystal I2C. The default one by Frank deBrabander works great. The warning "THIS LIBRARY MIGHT NOT BE COMPATIBLE WITH EXISTING SKETCHES" is probably valid, but I had no issues. 2. Be sure to check the pin order on the I2C thing. They are labeled. Don't just trust pictures in tutorials. 3. The device ID on mine was indeed 0x27. Apparently there is at least one other commonly used value possible, 0x3F. I saw nothing on my display initially, so I tried the I2C scanner on Instructables, which confirmed mine was indeed 0x27. Moral of the story? The potentiometer on the back is very important! Once you're sure your device ID is correct, adjust brightness. Very good deal for what it is - 16x2 characters, nice and bright, and only requires 4 pins (2 of which are power and ground).

Very inexpensive screens that work well. Easy to connect thanks to the I2C backpack. The adjustable contrast is really nice as well. Works perfectly for my Arduino projects.

Got the 2 LCD screens! After connecting them to my Arduino and getting a code I can say that these work perfectly. They even came with the I2Cs soldered on the LCD screen. Highly recommend if you’re in need of some LCD screens.

Good display that can display any ASCII character as well as custom characters. It has a white background light that you can turn off by pulling a jumper on the back. I am using this display with a Raspberry Pi Pico. Initially I had difficulties because I confused the physical pin numbers with the logical pin numbers. I soldered SDA and SCL to the physical pins 4 and 5 on the left side of the RP Pico, and incorrectly used "Pin(4)" and "Pin(5)" in my MicroPython script. After changing the script to the logical pin numbers 2 and 3 it worked great. Here is the correct mapping: Solder pin 4: I2C1 SDA = GP2 = Python Pin(2) Solder pin 5: I2C1 SCL = GP3 = Python Pin(3) GeeekPi 16x2 LCD address = Python 0x27 LCD displays take time until the text becomes readable. As an experiment I tried to run several counters as fast as possible (write both display rows more than 3 times/sec). The text - particularly on the second line - was not recognizable. My recommendation is to update the display not more than once per second if you write both lines.

Cheap, bright, good contrast control w/backpack. Happy to use in future Pi Projects. Slightly finicky with power draw on Rpi3b at 5v 1.5amp cell phone charging brick and cable vs. OEM 2.1amp power supply wall wart.

very easy to setup and get going

Great Quality bright display easy setup using instructions provided on the link provided Preforms good for price and requires only 4 wire to use ! works with both Arduino and Raspberry

One of the two screens works intermittently whenever the contrast variable resistor gets touched, and since the colder joints are under the LCD screen, I can't get in there to reflow the cold solder joint(s). Probably just some bad luck, as I don't think this quality control issue is common. The screens are fantastic otherwise.