SerLCD 20×4, RGB Backlight, Qwiic (LCD-16398)

£30.00 inc VAT

Out of stock

SKU: PPLCD-16398 Categories: ,
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The SparkFun SerLCD is an AVR-based, serial enabled LCD that provides a simple and cost-effective solution for adding a 20×4 Black on RGB Liquid Crystal Display into your project.

This version of the control board has been updated to include an ATmega328P to handle all of the screen control, which means that a separate backpack is no longer required!

This display can communicate using either serial, I2C, or SPI and comes equipped with a Qwiic connector, bringing serial LCDs into the Qwiic ecosystem, which simplifies the number of wires needed and allows your project to display all kinds of text and numbers.

The onboard 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 open source and allows for any customizations you may need.


  • 20×4, 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
  • Input voltage: 3.3V-9V (3.3V only via Qwiic connector and “+” pin)
  • I/O logic levels: 3.3V
  • Current consumption @ 3.3V
    • minimum with no characters
      • 4.5mA (LEDs off)
    • maximum with all character spaces filled
      • 21.7mA (red)
      • 17.2mA (green)
      • 15.5mA (blue)
      • 41.1mA (white)


  • Length: 97.67mm
  • Width: 60.23mm
  • Height: 15.32mm


  • 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.

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