Product info states "for the backlight, just connect pin a to 3.3v and k to gnd, and then it will light up." how does one operate it from 5v?

If you are controlling with an Uno it has 3.3v pin

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💡 Illuminate Your Ideas with HiLetgo!

USER FRIENDLY DESIGN - Perfect for beginners, making complex projects feel like a breeze.
ELEVATE YOUR PROJECTS - Transform your electronic experiments with vibrant blue backlighting.
HIGH CONTRAST DISPLAY - Enjoy a wide viewing angle with crisp, clear characters.
VERSATILE COMPATIBILITY - Seamlessly integrates with Arduino UNO, MEGA2560, Nano Due, and Raspberry Pi.
COST EFFECTIVE INNOVATION - Achieve professional results without breaking the bank.

The HiLetgo 2pcs DC3.3V HD44780 1602 16x2 Character LCD Display Adapter Module features a stunning blue backlight and is designed for compatibility with popular platforms like Arduino and Raspberry Pi. Ideal for both beginners and seasoned developers, this module is perfect for a variety of electronic projects, offering a high-contrast display and user-friendly setup.

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Brand	HiLetgo
Item model number	3-01-0710-2pcs
Hardware Platform	Arduino
Item Weight	2.39 ounces
Package Dimensions	3.74 x 2.28 x 1.26 inches
Color	Blue
Manufacturer	HiLetgo
ASIN	B079M3GWFG
Is Discontinued By Manufacturer	No
Date First Available	February 5, 2018

HiLetgo 2pcs DC3.3V HD44780 1602 16x2 Character LCD Display Adapter Module Blue Backlight for Arduino UNO R3 MEGA2560 Nano Due Raspberry Pi

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