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).

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.

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.

After working all day, I finally figured out why neither of my displays worked! The Listing says use address 0x27. That's wrong. I had to use 0x3F to get it to work! Neither does the documentation say which I2c library works. I kept trying different ones. Maybe they all worked, I don't know whch one I wound up with. Now that it works, it works great. One Added Note: Soldered ds1307 directly to the back pins which is a nice mount and space saver. Will buy again.

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.

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.

I have a picow, a rotary encoder and a popular LCD. This worked however the display so slow, the picow I was missing clicks on the encoder. I can not get ahead of this 1602 display with the rotary encoder. I can read this without my glasses. This can run on 5 volts which means you can bypass the pico and run it strait off your usb power supply. This 1602 does not need logic shifters from 3.3 to 5 volts. I wish I would have started with this display instead of killing a whole day with the led display. This is saving my project !!

very nice for the eyes and very readable.. easy to use with the I2C.. not great if on battery (because consumption is 20-25ma) but love this display and the next one will be 4x20 just for fun!!

Arrived quickly and well packed. Good display and easy to use

Utilisé pour divers projets DIY avec Arduino, reste à voir les boitiers et les rendre autonomes avec VCC, bcp utilisés pour différente programmation, semble bien efficace et solide!

If it doesn't work immediately, the LCD address might be "0x3f" or "0x27" so try both. Also try a couple different libraries and check for updates. I was having issues and was tinkering with these... but it just started working. I'd like to advise exactly as to what worked, but I don't know what did the trick.

It works, but hard to read, even after adjusting the potentiometer. Both of the ones I received are pretty much the same - the contrast between the blue background and the whitish lettering is very bad. I'd recommend going with an OLED module if you can - they are super sharp and you can't even see the refreshes when the screen renders.