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Description
SparkFun 20x4 SerLCD - RGB Backlight (Qwiic) 3.3v#LCD 16398 The SparkFun SerLCD is an AVR based, serial enabled LCD that provides a simple and cost effective solution for adding a 20x4 Black on RGB Liquid Crystal Display into your project. We've seriously overhauled the PCB design on the back of the screen by including an ATmega328P that handles all of the screen control, meaning a backpack is no longer needed! This display can now communicate in three different ways: serial, I2C, and SPI. This
#LCD-16398
The SparkFun SerLCD is an AVR-based, serial enabled LCD that provides a simple and cost effective solution for adding a 20x4 Black on RGB Liquid Crystal Display into your project. We've seriously overhauled the PCB design on the back of the screen by including an ATmega328P that handles all of the screen control, meaning a backpack is no longer needed! This display can now communicate in three different ways: serial, I2C, and SPI. This version comes equipped with a Qwiic connector, bringing serial LCDs into the Qwiic ecosystem. This simplifies the number of wires needed and allows your project to display all kinds of text and numbers.
The on-board ATmega328P AVR microcontroller utilizes 11.0592 MHz crystal for greater communication accuracy with adjustable baud rates of 1200 through 1000000 but is default set at 9600. The firmware for this SerLCD is fully opensource and allows for any customizations you may need.
Note: Since the SerLCD is a 3.3V device, please make sure you convert to 3.3V logic depending on your chosen microcontroller or single board computer. Otherwise, you may risk damaging your board.
Features
- 20x4, Black on RGB Display
- The AVR ATMega328p (with Arduino-compatible bootloader) is populated on the back of each LCD screen and handles all of the LCD control
- Three communication options: Serial, I2C and SPI
- Adjustable I2C address controlled via software special commands (0x72 default)
- Qwiic connection
- Emergency reset to factory settings (Jumper RX to GND on bootup)
- Operational backspace character
- Incoming buffer stores up to 80 characters
- Pulse width modulation of backlight allows direct control of backlight brightness and current consumption
- Pulse width modulation of contrast allows for software defined contrast amount.
- User definable splash screen
- Open-sourced firmware and Arduino-compatible bootloader enables updates via the Arduino IDE
- Dimensions (LxWxH): 97.67x60.23x15.32mm
- Weight: 68g
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4.3 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Stylish, Sturdy, and Simple to Put Together
Color: Black, Size: 23x29
The wall cabinet was very easy to put together and is good quality. It looks attractive, feels sturdy, and fit our needs perfectly. I’m very happy with the purchase.
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Reviewed in the United States on January 16, 2026
★★★★★ 5
Very nice cabinet
Very good quality and quite sturdy, although it is a bit heavy. It took some time and it was not easy but I put it together by myself. I love the color. It looks great in my bathroom that already has a lighted vanity mirror. Overall, I recommend this cabinet.
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Reviewed in the United States on April 23, 2026
★★★★★ 5
Great, Large sturdy cabinet
Color: Black, Size: 23x29, Color: Black, Size: 23x29
I was looking to add more storage to my tint bathroom, and so a cabinet for over the toilet was my first plan of attack. This cabinet is large, has a semi open niche (protected from hella dust), and the doors match the style of my builders vanity, so i went with it.
Assembly:
It was VERY easy to assemble. Some things you get off amazon are a nightmare, this was thankfully pretty quick and sturdy. It came with all the hardware I needed, and the only assembly tool was a Philips Head screwdriver, and the different pieces were labeled well.
Mounting:
THE WALL ANCHORS INCLUDED ARE TRASH. Thank you for attending my TED talk. The cleat for mounting is about a foot long, so while i couldnt get it mounted in 2 studs, i mounted one side in a stud and used a toggle bolt for the other side. I would HIGHLY RECOMMEND using a toggle bolt for something this heavy, and having one end directly in a stud. The french cleat mount meant i could slide the cabinet a bit to center it above the toilet, but with some lifting. That isnt gonna move at all with everyday use. I also like that i can take it down and put it back up easily.
Smell:
I didnt notice any weird smells on mine, tho it did sit in my hallway for about a week before i got around to assembling it.
I used some stick and peel tile to dress up mine, and ill also add some hardware to make it look more bespoke, but overall im super thrilled with it. Would recommend.
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Reviewed in the United States on October 10, 2023
★★★★★ 4
Beautiful and Sturdy
Color: Texture Grey, Size: 25x30, Color: Texture Grey, Size: 25x30
The cabinet relatively high quality and sturdy. Assembly was not difficult, it took less than an hour, and the color is beautiful and exactly as pictured. The soft close doors are such a big bonus as I tend to accidentally slam doors shut so these doors are me-proof. It arrived in well insulated packaging, there were no missing parts, and the instructions were not difficult to decipher. However, I do have a few items that bothered me enough to deduct a star from the rating
1) The wall mounting system, has predrilled holes that are not the standard 16 inch apart per house's studs. The mounting hardware was subpar and we ended up procuring more sturdy mounting hardware. The cabinet is fairly heavy when it's empty so we wanted to ensure adequate support. The cost of the cabinet is higher than many others I looked and would have liked better mounting hardware - minus one star
2) I wish I had paid closer attention to the shelf heights as the clearance from the middle shelf to the top shelf when it's in the top shelf is in the highest position (top shelf is the only shelf that can be moved) was not tall enough to hold my large industrial size shampoo and conditioner bottles so storage was a little disappointing but I consider it my mistake for not measuring before purchasing - no rating deduction
3) We tried multiple configurations to try and get the doors to perfectly align and could not make it happen. Alignment was disappointing but again I am going to blame that on operator error - no rating deduction
Overall, it is a nice cabinet and works well and looks good. I would absolutely recommend.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Lovely cabinet but needs time to put together!
Color: White, Size: 23x29
The overall cabinet is what I was looking for. Very sturdy and good looking. The main problem my husband had was with the directions to put it together. The pictures were hard to see and the majority of written directions were hard to understand. Definitely took longer to put together than should have taken. But when it was completed and hung, I have to say I love it. Be prepared to have patience and enough time set aside to put it together.
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Reviewed in the United States on January 10, 2026