HiLetgo 2004 20X4 LCD Display LCD Screen Serial with IIC I2C Adapter Yellow Green Color LCD for Arduino Raspberry Pi

great buy

Amazing product

Displays seemed OK once the correct address was found. I ordered 2 in Feb. 2023, and both of them were at address 0x3F. This address is not even listed in the chart of possible addresses provided in the listing! I unsuccessfully tried all the addresses Id seen in previous reviews. (At that point I hadnt yet seen where a previous reviewer had reported that one of his two displays was found to be at 0x3F) I had to resort to an I2C address scanner for the Arduino that I found online. Note that one of the addresses the scanner reports may be the Arduino itself. Make a note of any addresses found, then unplug the display and scan again. The address that is now missing will be the displays address. Hope this helps someone.

Great product and works as designed. One screen came with a loose connection on the contrast potentiometer. At first one of the screens would not display the text and after looking into it I could get the I2C address but it wouldnt display any text. The green back light was fine and after testing the contrast pot I found that it was soldered enough, so I added solder and it works great now. Good price!

No issues with this. Using it with Arduino Uno. Almost plug and play.

The first was defective. The second is great. The I2C address in your program may need to be adjusted

Bought two screens and thought one was not working. HiLetgo was very quick to offer technical assistance. It turns out I just got two screens with different I2C addresses and I was trying to use the same address for both. I am now very happy with both. FYI the addresses for my screens were 0x27 and 0x3f. Or if you are smarter than me you can look up the PCF8574 datasheet and probe pins A0, A1, and A2 to determine exactly what your address is.

Worked as expected.

I like the LCD but I have found that if I even move my Audion or the wires around this LCD it will go nuts and start showing trash on the screen forcing me to have to reboot just to get back to working. I havent been able to pin down if its just the wares go to the Arduino or if there something on the display its self or the I2C board that is causing the drop outs. But besides that nit pick it a way better display then the blue 16x2 display I have. Much easier to read even with high sunlight due to the fact its a black text not a white text.

No complaints. Does the job. Everything works