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).

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

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 0x27LCD 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.

These are great little units. They do not take much power, in fact I connected the power to an output pin of an Arduino and I can turn it off and on when I need to display something ( for extreme low power ). If you are just doing text, the LiquidCrystal_I2C arduino library has a minimal code footprint that works well. Don't forget that the small two pin header on the back needs a jumper ( or a resistor for less brightness ) in order for the display to work. The contrast adjustment pot on the back will optimize the contrast of the LCD.

I bought these displays for use on my Arduino Uno. The description clearly shows cables for both and Arduino and a Raspberry Pi, but what was delivered were eight cables for the Raspberry Pi. Since I have lots of extra cables, not a big deal, but not as advertised. I've checked both displays and they work fine.

I've tried one so far and it works as advertised!Pros:-The 2 pin I2C connection is so much easier than the alternatives you see with all sorts of wires trailing off.-The screen is bright and vibrant. Perfect for a simple menu or readout-The controller board is conveniently soldered to the display. Plug and play is painless.Cons (Sort of):-The wiki doesn't give much detail about which library to use or where to download it from. It says LiquidCrystal_I2C, but when you search for that, you get a bunch of different results. It took me 3 tries to find the right one. Search through Arduino IDE, scroll a ways, and you'll see one that matches verbatim. (Not a huge con honestly, it's just giving the author would have been nice).-The only other con is common to all displays like these. 16 character 2 line displays are pretty limiting to what you can do with them, but again, as long as you count out the letters you want before purchasing, you'll be fine. These things are great.

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.

These took a little more effort to figure out than the "same" screen purchased from Adafruit but once I got them working they seem to work fine in our escape room for a lot less cash. If you are comfortable with Arduino and microelectronics then you'll have no issue. Luckily most of these things are identical no matter who's brand name is on them.