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

Good product. Good seller.

Amazing product

You need female to male cables to hook it to the Arduino board. It powered up fine and shows the 4 lines you see in the picture of the product. However, I can not get it to write to line 4 ; lines 1,2,3 work fine but anything to line 4 over writes the data on line 2 ????? One day later and nothing will display; but the backlight is on and rows 1 and 3 have dark cursors in every column. Adjusting the POT does nothing. Got a replacement unit and it does the same thing; didt even show the original splash screen. Someone else had this same problem with two units. Arduino board works fine with the 16x2 screen that came with the kit. I give up.

It works nicely and seems to be good value for the low cost. I had to play around finding the right library file to get it to work-the one on Last Minute Engineers works fine, and they have a nice tutorial to help get it running.

The display arrived in a padded envelope but well protected by several layers of bubble wrap. Internet searching for 20x4 LCD Arduino I2C provided code for testing and hookup data. I used the newest library for LCD display on my Arduino: LiquidCrystal_I2C. My display had an I2C address of x3F. If yours doesnt just google I2C address sniffer for an app that will ferret out your LCDs address. Nice clean product that works fine-- word of advice.. if no display results be sure and adjust the pot on the back of the unit, also I had to put in a jumper on the back I2C board to get the backlight. Ordered 7/26/18 got it 7/30/18 - over a weekend!

I bought this display to use in a GPS clock that displays local time and date and UTC time and date. Here are my observations. 1. Its big! I should have read the specs more closely, but its much bigger than I expected. 2. The contrast is OK, but its nothing to write home about. 3. The viewing angle is very small. Once you get about 30-degrees off-axis, the contrast falls off rapidly. You have to be almost dead in front of the display to read it. 4. The default brightness of the backlight is very bright - too bright for me - harsh even. It lights up a room at night. I added a 330-ohm resistor to tone it down a bit. Otherwise, its a standard LCD display, and writing code for it is pretty simple. For what its worth, the hd44780.h display library is MUCH faster than other libraries (such as LiquidCrystal_I2C.h). I highly recommend it. I am undecided if I will use this display in my project. The viewing angle is just so small, and thats not great for a clock. A TFT display can be had for about the same price, and the viewing quality and versatility are much better. That being the case, I would not recommend this display.

No complaints. Does the job. Everything works

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.

I much prefer these green LCD displays with the yellow backlight because I can read them with the backlight off which saves about 40+ ma. Some of the projects put the Arduino to sleep as I am trying to minimize power draw. The blue LCDs are not really readable when the backlight is off.

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