Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards |
| Origin | - |
| Chip Model | MCP23017 |
| Interface Protocol | I2C |
| GPIO Pins | 16 Configurable I/O Pins |
| Operating Voltage | 3.3V / 5V Compatible |
| Max I2C Speed | 1.7 MHz |
| Interrupt Outputs | INTA and INTB Pins |
| Address Selection | 8 Configurable Addresses via Jumpers |
| Compatible Platforms | Raspberry Pi, Arduino, STM32, Micro:bit |
| PCB Dimensions | 43mm x 25mm |
| Mounting Holes | 4 x 3mm Standard Mounting Holes |
Anonymous
Mar 26, 2026
Rating: 5/5
Reliable for industrial prototyping
We used several of these for a control panel prototype. The interrupt features work reliably, and the ability to set different addresses allows us to chain multiple modules without conflict.
Anonymous
Mar 22, 2026
Rating: 5/5
Stable performance under load
Running 12 inputs and 4 outputs simultaneously with no lag or dropped signals. The MCP23017 chip handles the traffic well, and the Waveshare implementation is robust.
Anonymous
Mar 20, 2026
Rating: 4/5
Great value, clear documentation
Solid build quality and the wiki documentation is very detailed. I deducted one star only because the jumper caps were a bit tight, but otherwise, it's an excellent expansion board for STM32 projects.
Anonymous
Mar 20, 2026
Rating: 5/5
Perfect for expanding GPIO on Raspberry Pi
This module works flawlessly with my Raspberry Pi 4. The I2C setup was straightforward using the provided Python library, and having 16 extra pins solved my project bottleneck immediately.
Anonymous
Mar 19, 2026
Rating: 5/5
Easy to use for beginners
As someone new to I2C communication, this board made learning easy. The examples for Arduino worked out of the box, and the pin labeling on the PCB is very clear.
Anonymous
Mar 04, 2026
Rating: 4/5
Compact and functional
Fits perfectly in my robot chassis. The voltage selection jumper is a nice touch for switching between 3.3V and 5V logic levels depending on the sensor array being used.
Q: What is the maximum current each pin can source or sink?
A: Each I/O pin can typically source or sink up to 25mA, but we recommend keeping loads under 20mA per pin for optimal longevity and stability. For higher current devices, please use external transistors or relays.
Q: Is a separate library required for Micro:bit?
A: Yes, you will need to import a specific MCP23017 extension or write a custom driver using the I2C blocks available in the MakeCode editor. We provide example code on our product wiki.
Q: Does this support interrupt handling for button presses?
A: Absolutely. The module features two interrupt output pins (INTA and INTB) that can be configured to trigger when input states change, reducing the need for constant polling.
Q: Can this module be used with a 5V Arduino Uno?
A: Yes, the module supports both 3.3V and 5V logic levels. You can select the operating voltage using the onboard jumper header.
Q: How many of these modules can I connect to a single I2C bus?
A: You can connect up to 8 modules on a single I2C bus by configuring the address jumpers (A0, A1, A2) to unique combinations for each board.
Kunzite Loose Beads Donghai Crystal Agate Chalcedony Jade Gemstone Bracelet Pendant Single Bead Cat's Eye Accessories
$6.72
FAW J6P Wiper Arm Assembly for JH6/J6M/J6L, Large and Small J6 Trucks and Tractors
$11.00
Universal Front Mount Hook for E-Bikes and Motorcycles, No-Drill Helmet and Delivery Bag Hanger
$5.98
Huapu Haiyu Haixun Haishang Haiyue Haifeng 1.3L 1.XL 1.8L Clutch 5 Three-Piece Assembly
$436.00
Portable Oxygen Concentrator with Replaceable Batteries - Complete Set Including 4-Core, 8-Core, and 12-Core Batteries with Charging Base
$400.00
Custom 90° Right-Angle Hook Tool for Pulsator Washing Machine Base Removal
$2.36
MOMA Small Ma 4K Wireless Video Transmission System with HDMI and SDI for Filming and Live Streaming
$1,999.00
Youzhao Pai Creative Retro 3D Embossed House Number Plate – Custom Door Signs for Villas, Commercial Spaces, and Homes
$200.00
Tianzheng DZ15LE-100/3N901T 100A Transparent Leakage Circuit Breaker, Molded Case Circuit Breaker 3901T 63A
$278.00
![[Daimai Holds Micro-Needle Hair Transplant Patent] Little Red Cap Hydro Glow | Scalp Hydration and Repair](https://www.gosteppe.com/cache/small/product/270424/legacy-main-ecbdc6ee4688639f4a8ef150.webp)
[Daimai Holds Micro-Needle Hair Transplant Patent] Little Red Cap Hydro Glow | Scalp Hydration and Repair
$880.00
Pelican Rolling Case pelican1560 - Waterproof Shockproof Safety Case for Photography Equipment and Instruments
$1,550.00
Disipulai Hot Air Circulation Vertical Food Warmer Display Cabinet - Adjustable Temperature Countertop Cooked Food Warming Equipment
$2,023.00
Complete Pasteurization Production Line for Pomegranate, Grape, Orange, Apple Juice, and Mare's Milk
$6,048.00
Portable Tire Stone Removal Tool - Essential Handheld Hook for Car Owners
$13.73
Factory Direct Longan 160 Curved Hot Stamping Machine Fully Automatic Hot Foil Printer Pneumatic Heat Press Leather Embossing Machine
$10,000.00
Bean Sprout Germinator Tray, Hydroponic Vegetable Growing Container, Soil-Free Pea Sprouting Pot
$14.06
TOPTOY Crayon Shin-chan Memory Echo Series Blind Box - Anime Figure Collectible Toy and Birthday Gift
$47.20
Natural Lightning Cat's Eye Yellow Tiger Eye Loose Beads, Single Crystal Beads for DIY Bracelets and Accessories
$3.91
Pirelli Tire 235/55R19, Original Equipment for Mercedes-Benz GLC, Genuine Tire Compatible with Audi/Land Rover/etc.
$512.00
Biliansheng Hair Transplant: No-Shave Hairline Restoration, Top Thinning Density Enhancement, Nationwide Chain
$9,999.00
Luru Authentic 15-Note Steel Tongue Drum - Professional Grade for Beginners, Adults, and Children
$500.00
![MOOCAT [Postage Stamp Stub] Hand-Drawn Blank Irregular Wood Pulp Fine-Texture Paper for Cyanotype, OC Signing, and Collage](https://www.gosteppe.com/cache/small/product/270412/legacy-main-3037a70329c5379f7064bc16.webp)
MOOCAT [Postage Stamp Stub] Hand-Drawn Blank Irregular Wood Pulp Fine-Texture Paper for Cyanotype, OC Signing, and Collage
$9.90
Used Car Tires - Sizes 155/165/175/185/195/205/215 for 13/14/15/16 inch Rims
$140.00
Pin Puller Extractor Mechanical Repair Tool Bearing Puller and Locating Pin Extractor
$76.50
Water Brush Pen Set with Large Capacity - Essential Tools for Beginners Using Gouache, Solid Watercolor Paints, and Line Drawing; Perfect for Art Students
$32.00
C9335 Automotive Brake Disc Lathe – Resurfacing, Boring, Grinding & Polishing Machine
$16,005.00
Jaguar Tire Lug Nuts Compatible with XE/XF/XJL/F-TYPE/F-PACE - Wheel Hub Screw Caps for Modification
$118.00
Three-Hook Tire Stone Removal Tool, Wheel Groove Cleaner for Removing Stones from Vehicle Tires
$4.80
Pad Printer Accessories: 4-Inch Blade Clamp, Blade Holder, and Doctor Blade Assembly
$5.40
3M Industrial Scouring Pad 7447C, Metal Rust Removal, Stainless Steel Brushing and Polishing Cloth
$4.00
![[Youxin Electronics] GP2Y0E03 Infrared Distance Sensor Module 4-50cm Range](https://www.gosteppe.com/cache/medium/product/74667/legacy-main-4da8cadc5fc82afe91b124e3.webp)
![[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set](https://www.gosteppe.com/cache/medium/product/208273/legacy-main-9ec245ebf781f65a434ba854.webp)
