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

As an I2C device this was a no brainer and didnt consume any pins on my Arduino since the I2C bus is shared with several other devices. Once you adjust the potentiometer for the brightness it is very nice to read. It needs a different library than its 16x2 cousin but that was a breeze to find and install.

I was skeptical that a yellow backlit LCD would be visually appealing, but the contrast between the yellow background and the black letters is the best I have seen of any other color combination. It is amazingly clear and bright. The unit I received has an I2C address of 0x27 just like the product description states. The LiquidCrystal_I2C and LiquidCrystal_PCF8574 libraries from GitHub both work equally well with this unit, so you can use either one. HOWEVER, both libraries turn the backlight off by default so having the backlight jumper on the I2C interface isnt enough, you must ALSO use lcd.setBacklight(1) in your program to activate the backlight.

Good product. Good seller.

Worked as expected.

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.

Needed to adjust the potentiometer on the back to get it to display but works good for the price.

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.

Easy to find existing libraries in Arduino

great buy

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?