16 Output I/O Expander Breakout - SX1509

Overview

Expand your microcontroller's I/O capabilities effortlessly with the SX1509 16-Channel I/O Expander Breakout. This compact board, built around the powerful SX1509 chip, provides 16 additional GPIO pins via a simple I2C interface, freeing up your main controller for more complex tasks. Beyond basic I/O, it doubles as a fully programmable LED driver, capable of controlling up to 16 LEDs with individual brightness control, blinking, and breathing effects—all without taxing your main processor.

Key Features

• 16 Extra I/O Pins: Add 16 GPIOs to any I2C-enabled microcontroller (Arduino, ESP32, Raspberry Pi, etc.).
• I2C Interface: Easy 2-wire connection (SDA & SCL) with selectable addresses (up to 8 boards on one bus).
• Programmable LED Driver: Each pin can be configured as an LED driver with 8-bit PWM (256 steps) for smooth dimming, blinking, and breathing effects.
• Interrupt Output: Dedicated interrupt pin alerts your MCU when input states change, reducing polling overhead.
• Wide Voltage Range: Operates from 2.0V to 5.5V, compatible with 3.3V and 5V logic levels.
• On-Board Level Shifting: Built-in level shifting makes it safe to use with both 3.3V and 5V systems.
• Compact Design: Small breakout board with standard 0.1" header spacing, breadboard-friendly.

Technical Specifications

• Chip: SX1509 (Semtech)
• Number of I/O: 16 (configurable as inputs or outputs)
• Interface: I2C (up to 400 kHz)
• I2C Addresses: 7 selectable via address jumpers (0x3E to 0x70)
• Operating Voltage: 2.0V - 5.5V
• PWM Resolution: 8-bit (0-255)
• LED Driver Modes: On, Off, Blink, Breathing (with configurable rise/fall times)
• Interrupt Output: Active low, open-drain
• Dimensions: 25.4mm x 22.9mm (1.0" x 0.9")
• Weight: 3.5g
• RoHS Compliant: Yes

Applications & Use Cases

• LED Control: Create stunning LED matrices, mood lighting, or status indicators with individual brightness and effects.
• Button Matrix: Read multiple buttons or switches without consuming all your MCU pins.
• Sensor Interfacing: Connect multiple digital sensors (e.g., PIR, IR, limit switches) with interrupt-driven detection.
• Relay Control: Drive multiple relays for home automation projects.
• Prototyping: Expand your breadboard projects without rewiring.
• Wearables: Manage multiple LEDs and sensors in compact designs.

What's Included

• 1x SX1509 16-Channel I/O Expander Breakout Board
• 1x 16-pin header (unsoldered)
• 1x 2-pin JST connector (for battery or power input)

Compatibility

• Microcontrollers: Arduino (Uno, Mega, Nano, etc.), ESP32, ESP8266, Raspberry Pi (via I2C), STM32, Teensy, and more.
• Libraries: Use Adafruit's SX1509 Arduino library (easy to install via Library Manager) or write custom code for other platforms.
• Logic Levels: 3.3V and 5V compatible.

MOKWN Recommendation

Whether you're a hobbyist or a professional, the SX1509 expander is an essential tool for any project that needs more I/O pins or sophisticated LED control. It's perfect for Egyptian makers working on robotics, home automation, or creative lighting projects. Pair it with any of our Arduino or ESP32 boards for a seamless experience. Add it to your cart today and unlock the full potential of your microcontroller!