[EOL] ESP32 GRAY Development Kit with 9-Axis Sensor


Regular price $44.90


Shipping calculated at checkout.


M5Stack GRAY Kit is one of the M5Stack development kit series, which is a upgrade from the Basic kits. In comparison, Gray kit provides an extra IMU sensor, BMM150 + MPU6886. Gray kit is a nice choice for users who just get started or in progress.

With a IMU posture sensor, there are a lot of situations which u can apply this kit to: detecting acceleration, angulation, and trajectory. You can make relative products like sports data collector, 3D remote gesture controller and more base on the above functions.

GRAY is M5 Core device. Its modular, stackable, scalable, and portable device is powered with an ESP32 core, which makes it open source, low cost, full-function, and easy for developers to handle new product development on all stages include circuit design, PCB design, software, mold design and production.

If you want to explore the fastest way of IoT prototyping, M5Stack development board is the perfect solution. Not like others, M5Stack development board is highly efficient, covered with industrial grade case and ESP32-based development board. It integrates with Wi-Fi modules and contains a dual-core and 16MB of SPI Flash . Together with 30+ M5Stack stackable modules , 40+ extendable units and different levels of program language, you can create and verify your IoT product in a very short time.

Supportive development platforms and programming languages: Arduino, Blockly language with UIFlow , Micropython. Regardless of what level programming skill you have, M5Stack would guide you in every step of the way to realize your idea as well as to the final productization.

If you ever played with ESP8266, you would realize that ESP32 is a perfect upgrade out of ESP8266. In comparison, ESP32 has more GPIOs, more analog inputs and two analog outputs, multiple extra peripherals( like a spare UART ). Official developing platform ESP-IDF has transplanted with FreeRTOS. With dual-core and real time OS you can get more organized code and much high speed processor.

Power on/off:
Power on: click the red power button on the left
Power off: Quickly double-click the red power button on the left
Note: By default, when USB is powered, it cannot be shut down**

This product is EOL now.

Product Features

  • ESP32-based
  • Built-in Speaker, Buttons, LCD
  • TF card slot (Up to 16GB support)
  • Battery Socket & Lithium Polymer Battery
  • Extendable Pins & Holes
  • M-Bus Socket & Pins
  • Compatible with multi-platform development:


  • 1x Gray
  • 10x Female-male Dupont
  • 1x Type-C USB(20cm)
  • 1x User Manual
  • 1x Sticker


  • Internet of things terminal controller
  • Stem education product
  • DIY creation


Resources Parameter
ESP32 240MHz dual core, 600 DMIPS, 520KB SRAM, Wi-Fi
Flash Memory 16MB (old: 4MB)
Power Input 5V @ 500mA
Port TypeC x 1, GROVE(I2C+I/0+UART) x 1
IPS Screen 2 inch, 320x240 Colorful TFT LCD, ILI9342C, max brightness 853nit
Speaker 1W-0928
Button Custom button x 3
Core Bottom Port PIN (G1,G2,G3,G16, G17, G18, G19, G21, G22, G23, G25, G26, G35, G36)
MEMS BMM150 + MPU6886
Battery 110mAh @ 3.7V
Antenna 2.4G 3D Antenna
Operating Temperature 0°C to 60°C
Net weight 49.2g
Gross weight 93g
Product Size 54 x 54 x 18.9 mm
Package Size 95 x 65 x 25mm
Case Material Plastic ( PC )


  • This tutorial will show you how to control Gray devices through the UIFlow graphical programming platform
    This tutorial will show you how to program and control Gray devices through Arduino IDE
    This tutorial will show you how to control Gray devices through Micropython programming
    How to control Dji Tello drone by M5stack and Uiflow blocks at your wrist!. A base for STEM projects
    Simple GPS tracker for M5Stack with informative display and several display options using the Tiny GPS ++ library.
    Using the M5Stack to visualize time series data of the Covid-19 pandemic.
    Modern times make modern solutions possible. Therefore, the step to a digital snow globe is not that far.
    The objective is to decompress clinics and hospitals to reduce the time of exposure of health personnel to the COVID-19 virus(Based M5Stack)
    Based on a LEGO NXT Mindstorm base for movement, and a M5Stack Grey Core for brains. Controlled by a simple web interface
    A project to prevent access of suspect Covid-19 positive in office or community. M5Stack Core Grey, RFID unit and NCIR body temp measure
    GPS logger that stores your location into a GPX file with a back end web server to view daily rides, add comments and multi-media files.
    Change relationship between plants and human and make much deeper relationship.
    An indoor positioning system based on Wi-Fi RSSI data to return to the right room of a hotel corridor. Maybe useless, but it works just fine!
    Building a smart planting system using M5Stack to monitor the lights, humidity, temperature, watering your plant automatically.
    Pretty accurate port of Sonic the Hedgehog from Sega Mega Drive to M5Stack. (But only first act of first zone.)
    M5Stick V + Adafruit Thermal Printer + M5Stack Gray = Instant Camera Printer
    A project to monitor Covid-19 disease, based on M5Stack Core Grey, show data rolling the relevant informations for each Italy region.
    An ultimate low cost device to track symptoms of menopause and keep data in the cloud allowing doctors to have a better patient history.

    Customer Reviews

    Based on 30 reviews
    Matthew Perez
    Awesome Product

    I have been happy with the M5Stack Core Grey so far. I think the design, details and functionality are excellent. I only gave it a 4/5 star because I have had some issues getting the GPS unit to work and finding the documentation or examples that work has been hard. The preloaded examples and the ones on the site(which are the same) don't seem to recognize the sensor. Some of the references I have found online for things like Power.getBatteryLevel() aren't actually in the M5Stack.h. I am using it purely with Arduino so far as I have more experience with that over Python or UIFlow. Since Purchase I have shown it to a few people who also purchased them. Keep making these great development products, but I would love some more help/guidance troubleshooting. I have recently joined the forum and hope to get some help there.

    I would certainly buy again!


    Funciona perfecto

    Gábor Káli

    ESP32 GREY Development Kit with 9-Axis Sensor

    Keanu Braun

    All is well!

    Great hardware great price!

    This entire eco system is very complete and well built out. You can get started very quickly with the Flow environment and switch to Arduino or Micropython at any time. There really are no limits or proprietary anything.

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