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

Display works. Sometimes. It will go from being perfectly readable to blackboxes and gibberish simply by looking at the display for too long. Contrast potentiometer does not stay set somehow. Spend the extra $4 to get a similar display from a better seller.

Worked as expected.

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.

After wasting time testing with the wrong address that was stated in the Amazon product description (no documentation came with the module) and finding out the right one (0x47) the display works nicely. Several pins were bent on the connector and jumper. What more to expect for that low price?

Nice bright display. Unfortunately it didnt last- it lost most of the characters. Now it is a 2x8 display. I restored the rating to 5 stars because further investigation showed it was an over voltage condition that damaged the display. Would recommend this product over the other sellers because the serial interface is already soldered in place, so saved a few minutes. Plus, a better price.

I received the LCD display like a couple of months ago and its still working and is way better than the led display that comes with the elegoo Arduino kit. also I am a human and also um...I forgot what I was gonna say. OH YEAH to get the library for the display you just look for LiquidCrystal_I2C by Frank de Brabander and you should be good. Again goof luck, this is a good product.

Follow Up: I just received the 2nd screen that I ordered to replace the broken one. This one is defective as well. This time it is detected on the I2C bus 1/5th of the time if that, and when sending data to it it similarly only works a small percentage of the time. Most of the time is doesnt respond at all - just the white blocks on 2nd and 4th rows. I should mention that I2C sensors and an OLED screen on the same I2C bus (same pins, wires) work 100% of the time. Will not be buying screens from HiLetGo anymore. Go with another brand for a few dollars more. Did not work. I scanned all I2C addresses and it did not show up at all - tried different wires, different spots on breadboard, etc to no avail. I also tried sending data to the two addresses suggested by others - but nothing happened. All it would do when connected to power is show the backlight and two rows (row 2 and 4) of white blocks. Contract adjustment did not help.

These are nice display modules with 2 wire I2c interface. Display is sharp and bright. Easy to read with or without the backlight. I tried to get a picture but my phone camera did not do it justice.

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

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.