To connect an external sensor to an M5Stack Core2, match the sensor’s protocol and wiring to the Core2’s port pin mapping before connecting it. The standard Grove ports are not interchangeable: PORT.A is I2C, PORT.B is DAC/ADC, and PORT.C is UART. A Grove connector that fits physically does not guarantee electrical or software compatibility.
Check the sensor protocol and Core2 port first
Start with the sensor’s documentation. Identify whether it communicates over I2C, UART, GPIO, or an analog input, then confirm its voltage and wiring requirements and choose a Core2 port with the matching pins. M5Stack describes the Core2 Grove interface as supporting I2C, I/O, and UART. Its product documentation lists these standard port mappings:
| Core2 port | Documented function | GPIO mapping |
|---|---|---|
| PORT.A | I2C | GPIO32/33 |
| PORT.B | DAC/ADC | GPIO26/36 |
| PORT.C | UART | GPIO13/14 |
These are the standard Core2 port assignments in M5Stack’s Core2 documentation. Verify the sensor’s required signals against the exact pin mapping rather than relying on the connector shape.
Use port colors as a clue, not a compatibility guarantee
M5Stack’s Grove guidance associates red with I2C, blue with UART, black with GPIO, and white with custom or undefined connections. The Grove terminal order is GND, 5V, and two communication I/Os. However, M5Stack cautions that GPIO mappings vary by unit; the Core2’s product-specific pin map is the decisive reference. See M5Stack’s Grove port documentation.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Determine whether you need an external sensor
The Core2 already contains sensing and control components on an internal I2C connection using GPIO21/22. M5Stack lists an MPU6886 IMU, AXP192 power-management IC, BM8563 RTC, and FT6336U touch controller on that bus. If your project only needs measurements or functions from those onboard components, an external sensor may not be necessary.
Do not treat GPIO21/22 as spare external pins: they are documented for internal I2C devices, and using them externally requires a separate hardware and firmware analysis. The internal bus and components are described in the Core2 documentation.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Add Grove connections with the Core2 ExtPort module
If your project needs more Grove connections, M5Stack documents the Module ExtPort For Core2, SKU M123, as a Core2-specific expansion that provides four Grove interfaces: ports B, C, D, and E. The module’s pin table lists B as GPIO26/36 and C as GPIO14/13.
Ports D and E use switch-selectable GPIO mappings. The documented alternatives include GPIO21/22, GPIO1/3, and GPIO0/2/25, which may overlap with internal I2C, serial-download, audio-related, or general functions. Check the module’s switch table and your board revision before wiring. M5Stack warns to turn on only one position per DIP switch; multiple positions may damage the device. Follow the instructions in the Module ExtPort For Core2 documentation.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
The module also has a physical-fit consideration: if preserving the Core2 bottom cover, its documentation notes that a mechanical modification and attention to screw length may be needed.
Set up the software for your sensor
Choose a development environment and confirm that it has a driver or example for the specific sensor. M5Stack’s Core2 documentation links resources for Arduino, UiFlow, PlatformIO, and ESP-IDF. Its technical overview recommends moving older individual product drivers to M5Unified for Arduino, while describing M5UnitUnified as alpha-stage; check the current library status before depending on it.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Software support does not remove the need to match electrical signaling and GPIOs. A working setup requires both compatible wiring and code configured for the sensor’s protocol and selected pins. M5Stack’s overview of its interface and software ecosystem is at What is M5Stack? — Intro.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Account for Core2 hardware revisions when compiling
M5Stack’s product page records that on 2026-08-07 the Core2 LCD model changed from ILI9342C to ILI9342E. For programs compiled for that display revision, M5Stack specifies M5GFX 0.2.27 or later. This is a display setup requirement, not evidence that the sensor-port mappings changed. The same page says units may ship with either a CP2104 or CH9102F USB bridge chip, with no functional or usage difference stated.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Choose a sensor by its measurement and interface
There is no single universally compatible sensor list for the Core2: suitability depends on what you need to measure and the module’s protocol, wiring, and pin requirements. Before selecting a Grove-compatible sensor, check:
- Measurement: Does it measure the quantity you need, over the required range?
- Protocol: Does it use I2C, UART, GPIO, or analog signaling?
- Port and pins: Does its interface match a Core2 port’s documented mapping?
- Electrical requirements: Do its voltage and wiring requirements match the connection?
- Expansion and conflicts: Do you need additional Grove ports, and could the selected pins conflict with onboard functions?
- Software: Is there a driver or example for your development environment?
M5Stack describes Grove as a modular interface for connecting sensors and actuators without soldering, but that convenience does not make every Grove module compatible with every Grove port. Check the individual module and Core2 documentation before connecting it.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
