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

great buy

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.

Good product. Good seller.

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.

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.

Replaced a 16x2 Lcd with this and I love it! Installing and modifications of the arduino code was a breeze. Used the LiquidCystal_I2 library. Example sketch included a scanner for finding the address. (0x27 on mine). If you are using a 16x2 this is a great upgrade!

No complaints. Does the job. Everything works

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?

It works as expected. Pretty easy to read once you adjust the contrast. Rated at 4 stars because it comes with zero documentation. They do seem to be pretty standard so I was able to get it working using an example for Arduino online.

I2C is the way to go to minimize the pin count used on your board. Love the contrast Black on Yellow display very bright and very easy to read, The Contrast control works great. Price point is about right for this product and Yes I will purchase more the next time I need more displays .