> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Adafruit 16x9 Charlieplexed PWM LED Matrix Driver - IS31FL3731

**Type:** Product page · **SKU:** ADA2946 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/adafruit-16x9-charlieplexed-pwm-led-matrix-driver-is31fl3731.html ([markdown](https://core-electronics.com.au/adafruit-16x9-charlieplexed-pwm-led-matrix-driver-is31fl3731.html.md))

The IS31FL3731 will let you get back to that classic LED matrix look, with a nice upgrade! This I2C LED driver chip has the ability to PWM each individual LED in...

## Pricing

- **Price:** $10.90 (inc GST) — $9.91 AUD, exc GST
- **Quantity discounts:** 10+ $9.61 (exc GST) · 50+ $9.42 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 02 and Sep 07.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA2946:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA2946:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

The IS31FL3731 will let you get back to that classic LED matrix look, with a nice upgrade! **This I2C LED driver chip has the ability to PWM each individual LED in a 16x9 grid** so you can have beautiful LED lighting effects, without a lot of pin twiddling. Simply tell the chip which LED on the grid you want lit, and what brightness and it's all taken care of for you.

The IS31FL3731 is a nice little chip - it can use 2.7-5.5V power and logic so its flexible for use with any microcontroller. You can set the address so up to 4 matrices can share an I2C bus. Inside is enough RAM for 8 seperate frames of display memory so you can set up multiple frames of an animation and flip them to be displayed with a single command.

This chip is great for making small LED displays, and Adafruit even designed the breakout to match up with Adafruit's ready-to-go LED grids in red, yellow, green, blue and white. Sandwich the driver and matrix breakout, solder together for a compact setup. Or you can DIY your own setup, just follow the LED grid schematic in the IS31FL3731 datasheet.

**Please note this does not come with any LEDs, you can pick up a matching LED matrix from Adafruit or DIY your own.**

Pick up a driver board and your favorite color LEDs to match. You'll need to do some basic soldering to attach the driver backpack and matrix together, and run wires to your microcontroller, but its not too hard. Then install Adafruit's Arduino code to get some LEDs blinking immediately. Adafruit's library is Adafruit\_GFX compatible so you can draw lines, circles, text, and small bitmaps if you want more graphics control

[Check out Adafruit's detailed tutorial for pinouts, assembly, wiring, and more!](https://learn.adafruit.com/i31fl3731-16x9-charliplexed-pwm-led-driver)

## Technical Details

- 43.3mm x 27.9mm x 2.4mm / 1.7" x 1.1" x 0.09"
- Weight: 4.2g
- [Schematic, Datasheet, EagleCAD PCB files, and Fritzing available in the product tutorial](https://learn.adafruit.com/i31fl3731-16x9-charliplexed-pwm-led-driver/downloads)

 ![](https://core-electronics.com.au/attachments/localcontent/rohs_icon_8216055e11.jpg)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/2/9/2946-00.jpg)