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

It's good that the LCD is LED-backlit however, I have found that even moving simply Audion or wires around this LCD will cause it to go nuts and start displaying junk, forcing me to reboot just to get back to work.

Kaliyah Snider

| Feb 14, 2021

In Python, you can access LCDs using the i2c_lcd class. On version 3, I had no problems. There is a 3v version, but it needs a 5v version. It comes with a jumper cap, but I also swapped it out for a 10k pot, so now I can set brightness as well (see picture). In addition, it is larger than you expected, especially when you used tiny OLEDs.

Aspen Decker

| Sep 23, 2020

It's so nice to have a LCD panel on my wall. It has lots of room for the calender and the best part is that it is easy to connect since there is no need for a bunch of wires. It can be made to use only a few wires with just the PCB already attached. As well, I have accidentally dropped it a few times and no damage was done to it since it is well-built. There is a bright, even backlight that is of a nice color.

Keyla Becker

| May 10, 2021

I am trying to keep power consumption to a minimum with my projects, so I am sleeping the Arduino. Blue LCD displays are not really readable when they do not have a backlight.

Zev Blair

| Jan 08, 2021

It was very quick for HiLetgo to offer technical support. The problem was that I just got two screens with different I2C addresses, so I tried to use the same address for them These two aspects of my life are now very satisfying to me. I was using 0x27 and 0x3f for my screens. Alternatively, for those of you who are a lot smarter than I am, you can look up the PCF8574 datasheet and probe pins A0, A1, and A2 to find out your address.

Lana Jarvis

| Nov 29, 2020

Glad to see it's bright now. There were a lot of characters, but it did not last long. The display now has a 2x8 aspect ratio. A subsequent investigation revealed that damaged the display was caused by an over voltage condition. As a result, I restored the rating to 5 stars. Because this product comes with the serial interface already soldered, i was able to save a bit of time compared to the other sellers. A better price is also included.

Sloan Hammond

| May 26, 2021

Using the code for testing and hookup data from "20x4 LCD Arduino I2C"
was found by searching the Internet. On my Arduino I used LiquidCrystal_I2C, the newest library for LCD displays. I had an I2C address of x3F for my display. There are several apps that will give you the LCD's address, if not then just search for "I2C address sniffer" on Google. I like the clean look of it and it works well-- I have some advice for you. If you do not see anything, be sure and adjust the pot on the back of the unit. I also had to use a jumper on the back of the I2C board to get the backlight to work. I ordered on Jul 26 and got it on Jul 30 I'll be there over the.

Allie BUTCHER

| Nov 13, 2020

I was skeptical that a yellow LCD would be visually appealing, but this contrast between the yellow background and the black letters is better than any other I was amazed by how clear and bright it was. As the product description states, the unit on which I received it has an I2C address of 0x27. LiquidCrystal_I2C and LiquidCrystal_PCF8574 libraries from GitHub both work well with this unit, so you can choose which one you want to use. The I2C interface only requires a jumper for the backlight, but both libraries turn off the backlight by default, so if you also want to use the LCD then you need to also use the jumper for the backlight. Your program should contain a setBacklight(1) function to turn on.

Enzo Greer

| Jan 28, 2021