Compact I2C/SPI Character LCD Backpack Featuring STEMMA QT and Qwiic Compatibility

Description

The Character LCD Backpack is an add-on circuit that makes it easier to integrate character LCDs into your microcontroller projects. It’s perfect for projects that need a simple display without consuming a lot of I/O pins. By using I2C and SPI input/output expanders, this backpack reduces the pin count to just 2 pins for I2C or 3 pins for SPI, freeing up your microcontroller for other tasks.

Key Features:

• Easy to Use: This backpack works with standard 16-pin character LCDs, from 8×1 to 20×4 sizes, making it versatile for various display needs. It is backward compatible with projects using the traditional 6-pin wiring and includes pre-soldered 2-pin and 3-pin terminal blocks for easy connection.
• Compatible with Arduino & CircuitPython: Whether you’re using an Arduino or CircuitPython, we’ve created an easy-to-use library that simplifies integration.
• Not Compatible with OLEDs: While it works perfectly with standard character LCDs, the backpack does not support 16×2 OLED displays. It can work with RGB 16×2 or 20×4 LCDs, but only for controlling the 14 digital I/O pins (pins #1-14); RGB backlighting requires additional wiring.

Recent Updates:

• Boost Circuit: A 3-5V boost circuit has been added, allowing you to control 5V LCDs even when using 3V power and logic.
• Improved Contrast Potentiometer: The contrast potentiometer has been upgraded for easy adjustment with a small screwdriver.
• STEMMA QT Connectors: Added SparkFun qwiic-compatible STEMMA QT connectors for I2C, making it even easier to interface with microcontrollers. Simply use a STEMMA QT adapter cable for a solderless connection (cable sold separately).
• Drop-in Replacement: The backpack’s functionality, size, and shape remain the same, so it’s a drop-in replacement with no code changes required.
• Updated Silkscreen: The updated PCB now features a clear and legible silkscreen, making assembly and use even easier.

Advanced Usage:

• General-Purpose I/O Expansion: Advanced users can repurpose the backpack for general-purpose I/O expansion. The MCP23008 I/O expander offers 8 I/O pins (7 connected) with optional pull-ups, and the SPI 74HC595 provides 7 connected outputs.

This Character LCD Backpack is a must-have for anyone looking to simplify their LCD project setup and free up microcontroller pins for other tasks.

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