This repository documents a detailed exploration of the M5Stack hardware ecosystem, focusing on building small interactive devices that combine motion sensing, audio playback, LEDs, haptics, RFID, and ultra-low-power operation.
The research compares different families of M5Stack devices, evaluates their expandability, and maps out which modules, batteries, and accessories are compatible with each hardware form factor.
Device and accessory reference tables are included below.
M5Stack provides a diverse range of ESP32-based development devices organised into several hardware families:
- Core series (classic 5×5 cm) — modular stackable controllers
- CoreS3 series (new generation) — advanced multimedia controllers
- Stick series — compact wearable-style devices
- ATOM series — ultra-small modular cubes
- STAMP modules — embedded boards for custom wiring
Each family has unique strengths and constraints, especially regarding audio, IMU functionality, battery integration, module compatibility, and power management.
Advanced multimedia devices with touchscreens, dual microphones, camera, IMU, and (on CoreS3) a magnetometer. Uses a new 30-pin base connector and does not support classic stack modules.
Designed around the 57×57 mm, 12-pin M-Bus form factor. Support stackable modules including:
- Battery modules
- Relay modules
- Audio Module (STM32G030)
- M5GO Bottom bases with 10 RGB LEDs
Small rectangular devices with integrated battery, IMU, small LCD, and optional Hats (speaker, sensors, buttons). The PLUS2 model adds a vibration motor and improved PMIC.
Ultra-small cubes featuring minimal ESP32 boards, often with add-ons:
- Matrix: 25 NeoPixels + IMU
- Echo: speaker + microphone
- Lite: minimal I/O
- Use via Grove connectors or direct wiring.
Classic stack modules (battery, audio, relay, proto, etc.) only attach to:
- Core (Original)
- Core2
- Core Fire
- M5GO
- Core2 AWS EduKit
CoreS3 does not use the classic M-Bus; Stick and ATOM devices rely on Grove and wiring instead of stacking.
Selecting hardware requires understanding this difference, especially when combining power modules or expansion modules.
Many M5Stack devices include inertial measurement units (IMUs) that provide accelerometer and gyroscope data. Devices with IMU capabilities include:
- ATOM Matrix (IMU)
- StickC PLUS2 (IMU)
- CoreS3 (IMU)
- Core2 (IMU)
- Core Fire (IMU)
- M5GO (IMU)
These sensors enable motion detection, orientation tracking, shake detection, and gesture recognition.
Only a few devices include a magnetometer:
- CoreS3
- Core Fire
Devices based on the MPU6886 (Stick series, ATOM Matrix, etc.) include only accelerometer + gyroscope.
Magnetometers enable compass features, orientation-corrected sensor fusion, and magnetic field detection.
Many M5Stack boards lack onboard speakers. To play audio, consider:
- StickC PLUS2 + Speaker Hat (MAX98357)
- ATOM Echo
- CoreS3 (built-in full I²S audio subsystem)
- MAX98357 I²S amplifier modules wired to ATOM or Stick devices
- Audio Module (STM32G030) for classic Core stackable devices
Short WAV/MP3 audio playback is feasible across the entire ecosystem when an appropriate amplifier is present.
RGB LED capabilities vary by device:
- ATOM Matrix offers a 25-pixel NeoPixel matrix
- Core Fire, M5GO, Core2 AWS EduKit include 10-pixel LED bars in their M5GO bottoms
- StickC PLUS2, ATOM Lite, ATOM Echo each include a single RGB LED
- CoreS3 has no onboard NeoPixels but works with M5GO Bottom3
These can be used for icons, animations, interaction cues, and visual feedback.
To add vibration feedback, consider devices with built-in motors:
- Core2
- M5StickC PLUS2
Other boards require wiring a coin-cell vibration motor.
RFID support is not built into any M5Stack Core or ATOM device. Use the RFID Unit 2 (WS1850S) over Grove (I²C/UART).
Compatible with:
- Core / Core2 / Fire
- CoreS3
- Stick series
- ATOM series
This enables actions such as sound or LED effects triggered by specific tags.
To create devices that run for long periods and only wake occasionally, true power gating is required — not just ESP32 deep sleep.
The M5Stamp Timer Power (BM8563) enables:
- RTC alarms
- timed wake-ups
- fully powering the ESP32 board off (microamp consumption)
- timed reactivation
It requires manual wiring and is independent of M5Stack form factors, making it ideal for embedded low-power projects.
Physical construction can be supported using:
- SandwichC Bricks (LEGO-compatible mounting plates)
- M3 screw kits
- M5 Box for storage and prototyping
These allow embedding M5Stack hardware into toys, enclosures, and kinetic experiments.
To build compact interactive devices (e.g., "cubes") that respond to shaking, rotation, or tapping, pair:
- a device with a 6-axis or 9-axis IMU
- either a built-in speaker or an I²S audio amplifier
- optional RGB LEDs for visual effects
- a small battery base (e.g., Atomic Battery Base or TailBat)
Useful hardware options include:
- ATOM Matrix (25 NeoPixels, IMU)
- StickC PLUS2 (IMU, vibration motor, small display)
- ATOM Echo (speaker onboard, needs external IMU)
- CoreS3 (more advanced but larger)
These devices can play short sounds when moved, light up LEDs, vibrate, or react to orientation.
The research identifies several patterns for building interactive devices:
- shake-to-sound cubes
- direction-aware toys using magnetometers
- RFID-triggered responses
- sound/light objects embedded in LEGO structures
- wearable sound/noise devices
- low-power IoT nodes waking briefly to perform tasks
- touchscreen audio-visual gadgets using CoreS3
These patterns benefit from selecting the right combination of IMU, speaker, LEDs, and power hardware.
The following devices and modules form a versatile experimental toolkit:
- CoreS3
- M5StickC PLUS2 + Speaker Hat
- ATOM Matrix
- M5Stamp Timer Power (RTC power gating)
- RFID Unit 2
- Atomic Battery Base
- Mini Dual Button Unit
- SandwichC Bricks
- M3 Screw Kit
This selection enables building portable sound toys, motion-reactive cubes, RFID-aware devices, and long-life low-power systems.
Device and accessory reference tables have been placed below.
These tables include detailed information on:
- footprints
- battery types
- IMU and magnetometer
- audio capabilities
- LED systems
- vibration motors
- camera and microphones
- RTC presence
- module compatibility
- whether an item is in the current hardware basket
| Device | Family | 12-pin M-Bus | IMU | Mag | Display | Speaker | Battery | SD | Vib | Camera | Mics | RTC | Extra LEDs | Where the pixels live | PiHut Link |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CoreS3 | Core (new) | ✘ | ✔ | ✔ | 2.0" touch | ✔ | ✔ | ✔ | ✘ | ✔ | ✔ dual | ✔ | 0 | None (unless adding Bottom3) | Search |
| CoreS3 SE | Core (new) | ✘ | ✘ | ✘ | 2.0" touch | ✔ | ✘ | ✔ | ✘ | ✔ | ✔ dual | ✔ | 0 | None | Search |
| Core (Original) | Core classic | ✔ | ✘ | ✘ | 2.0" LCD | ✔ | ✘ | ✔ | ✘ | ✘ | ✘ | ✔ | 0 | None | Search |
| Core2 | Core classic | ✔ | ✔ | ✘ | 2.0" touch | ✔ | ✔ | ✔ | ✔ | ✘ | ✔ | ✔ | 0 (10 w/ Bottom2) | LEDs in Bottom2 only | Search |
| Core Fire | Core classic | ✔ | ✔ | ✔ | 2.0" LCD | ✔ | ✔ | ✔ | ✘ | ✘ | ✘ | ✔ | 10 SK6812 | In M5GO base | Search |
| M5GO (Core kit) | Core classic | ✔ | ✔ | ✘ | 2.0" IPS | ✔ | ✔ | ✘ | ✘ | ✘ | ✔ | ✔ | 10 LEDs | In M5GO base | Search |
| Core2 AWS EduKit | Core classic | ✔ | ✔ | ✘ | 2.0" touch | ✔ | ✔ | ✔ | ✔ | ✘ | ✔ | ✔ | 10 LEDs | In M5GO Bottom2 | Search |
| M5StickC PLUS | Stick | ✘ | ✔ | ✘ | Small TFT | Buzzer | ✔ | ✘ | ✘ | ✘ | ✔ | ✔ | 0 | None | Search |
| M5StickC PLUS2 | Stick | ✘ | ✔ | ✘ | IPS TFT | Buzzer | ✔ | ✘ | ✔ | ✘ | ✔ | ✔ | 1 RGB | On StickC PLUS2 main board | Search |
| ATOM Matrix | ATOM | ✘ | ✔ | ✘ | 5×5 LEDs | ✘ | ✘ | ✘ | ✘ | ✘ | ✘ | ✘ | 25 WS2812 | On front LED matrix | Search |
| ATOM Lite | ATOM | ✘ | ✘ | ✘ | None | ✘ | ✘ | ✘ | ✘ | ✘ | ✘ | ✘ | 1 RGB | On main board | Search |
| ATOM Echo | ATOM | ✘ | ✘ | ✘ | None | ✔ | ✘ | ✘ | ✘ | ✘ | ✔ | ✘ | 1 RGB | On main board | Search |
| Accessory | What it does | Footprint compatibility | Where used | PiHut Link |
|---|---|---|---|---|
| M5Stamp Timer Power | RTC + timed power gating | Universal (wired) | Ultra-low-power / wake control | Search |
| M5StickC PLUS Speaker Hat (MAX98357) | Adds digital speaker | Stick family | Audio output | Search |
| Atomic Battery Base | 200 mAh battery | ATOM footprint | Portable ATOM builds | Search |
| SandwichC Brick (x3) | Lego-compatible adapter | Universal mechanical | Mounting | Search |
| RFID Unit 2 (WS1850S) | RFID reader | Any Grove-enabled device | NFC-like reading | Search |
| M5 Box | Storage | Universal | Storage | Search |
| M3 Screw Kit | Mounting hardware | Universal | Assembly | Search |
| Mini Dual Button Unit | 2-button Grove input | Universal | Input device | Search |
| Audio Module (STM32G030) | Stereo codec | Classic Core stack | External audio | Search |
| Core Battery Modules (13.2 etc.) | Extra battery | Classic 5×5 | Stackable | Search |
| M5GO bottom (RGB) | LED bar + battery | Core2 / Core Fire / CoreS3 versions | Adds 10 LEDs | Search |
| TailBat | Battery | ATOM | Portable | Search |
| M5StickC 18650 Base | 18650 battery holder | Stick family | Extended runtime for StickC | Product |
| M5Stack Base AAA Battery Holder | AAA battery holder | Classic Core stack | Alternative power for Core | Product |
| Generic I²S amp | Speaker amp | Any wired | External audio | Search |
flowchart TD
note1["ClassicCore<br/>• 57×57 mm footprint<br/>• 12-pin M-Bus on bottom<br/>• Compatible with stack modules:<br/> – Battery modules<br/> – Audio Module (STM32G030)<br/> – Relay / IO modules<br/>• Good for modular, stackable builds"]
subgraph ClassicCore["Classic Core Series (5×5 cm, 12-pin M-Bus)"]
C0["Core (Gray)<br/>• 57×57 mm classic Core<br/>• ESP32<br/>• 12-pin M-Bus stack<br/>• LCD, speaker, SD<br/>• No IMU / no magnetometer"]
C1["Core2<br/>• 57×57 mm classic Core<br/>• Touchscreen, speaker<br/>• Battery, SD<br/>• 6-axis IMU (no mag)<br/>• Vibration motor<br/>• 12-pin M-Bus stack"]
C2["Core Fire<br/>• Classic Core + IMU<br/>• 9-axis (MPU9250 with mag)<br/>• 10 RGB LEDs in M5GO base<br/>• Battery, SD, speaker<br/>• 12-pin M-Bus stack"]
C3["Core2 AWS EduKit<br/>• Core2 + M5GO Bottom2<br/>• 10 RGB LEDs in base<br/>• Battery, SD, speaker<br/>• 6-axis IMU (no mag)<br/>• 12-pin M-Bus stack"]
C4["M5GO (Core kit)<br/>• Core-style controller<br/>• 6-axis IMU<br/>• 10 RGB LEDs in M5GO base<br/>• Battery, speaker, mic<br/>• 12-pin M-Bus stack"]
end
note1 -.-> C0 note1 -.-> C1 note1 -.-> C2 note1 -.-> C3 note1 -.-> C4 flowchart TD
noteS3["CoreS3Series<br/>• Use a new 30-pin base connector<br/>• NOT compatible with classic 5×5 stack modules<br/>• Can use S3-specific bottoms (e.g. M5GO Bottom3) for:<br/> – Extra battery<br/> – 10 RGB LEDs<br/>• Best suited for rich UI, audio, camera, and sensing"]
subgraph CoreS3Series["CoreS3 Series (New 30-pin Base Connector)"]
S3["CoreS3<br/>• 54×54 mm S3 footprint<br/>• Touchscreen + camera<br/>• Dual microphones<br/>• 6-axis IMU + magnetometer<br/>• 500 mAh internal battery<br/>• SD card<br/>• No 12-pin M-Bus"]
S3SE["CoreS3 SE<br/>• Same footprint as CoreS3<br/>• Touchscreen, camera, dual mics<br/>• No IMU / no magnetometer<br/>• No internal battery<br/>• SD card<br/>• No 12-pin M-Bus"]
end
noteS3 -.-> S3 noteS3 -.-> S3SE flowchart TD
noteST["StickSeries<br/>• Designed for wearable / handheld projects<br/>• Expansion via Stick Hat connector + Grove<br/>• Good for:<br/> – Small UI devices<br/> – Wrist-worn or pocket tools<br/> – Motion + sound toys with Speaker Hat"]
subgraph StickSeries["Stick Series (Wearable / Slim Devices)"]
ST1["M5StickC PLUS<br/>• Slim stick form factor<br/>• 6-axis IMU (MPU6886)<br/>• Small TFT display<br/>• Internal LiPo battery<br/>• Microphone<br/>• No vibration motor<br/>• No 12-pin M-Bus<br/>• Uses Hat accessories (e.g. Speaker Hat)"]
ST2["M5StickC PLUS2<br/>• Updated StickC platform<br/>• 6-axis IMU (MPU6886)<br/>• Small IPS TFT<br/>• 200 mAh battery<br/>• Microphone<br/>• Vibration motor<br/>• Single RGB LED<br/>• No 12-pin M-Bus<br/>• Uses Stick Hats (e.g. MAX98357 speaker)"]
end
noteST -.-> ST1 noteST -.-> ST2 flowchart TD
noteAtom["AtomSeries<br/>• No stacking; no 12-pin M-Bus<br/>• Use Grove ports or direct wiring<br/>• Optional Atomic Battery Base for portable builds<br/>• Well suited for:<br/> – Tiny sound cubes (Echo)<br/> – Motion + LED cubes (Matrix)<br/> – Minimal IoT nodes (Lite)"]
subgraph AtomSeries["ATOM Series (Tiny 24×24 mm Cubes)"]
A_Lite["ATOM Lite<br/>• Minimal ESP32 dev board<br/>• Single RGB LED<br/>• No IMU<br/>• No speaker<br/>• No battery<br/>• Power via USB or Atomic base<br/>• Expansion via Grove / wiring"]
A_Matrix["ATOM Matrix<br/>• 24×24 mm cube<br/>• 5×5 RGB LED matrix (25 pixels)<br/>• 6-axis IMU (MPU6886)<br/>• No speaker built-in<br/>• No battery (pair with Atomic Battery Base)<br/>• Grove + GPIO for expansion"]
A_Echo["ATOM Echo<br/>• 24×24 mm cube<br/>• Built-in speaker<br/>• Microphone<br/>• Single RGB LED<br/>• No IMU<br/>• No battery (optional external base)<br/>• Grove + wiring for sensors"]
end
noteAtom -.-> A_Lite noteAtom -.-> A_Matrix noteAtom -.-> A_Echo flowchart TD
noteTP["StampSeries<br/>• Not stackable; requires soldering/wiring<br/>• Works with any ESP32 device (Core, Stick, ATOM, etc.)<br/>• Used to:<br/> – Cut power completely between wake events<br/> – Achieve ultra-low-power operation<br/> – Schedule timed wakeups"]
subgraph StampSeries["STAMP / Power Modules (Embedded / Wired)"]
STP["M5Stamp Timer Power (BM8563)<br/>• RTC + alarm<br/>• Li-ion charging<br/>• 3.3 V / 5 V output<br/>• Power gating of main board<br/>• Very low standby current<br/>• Small 20×20 mm module"]
end
noteTP -.-> STP flowchart TD
subgraph InternalPower["On-board / Integrated Power"]
IP1["CoreS3<br/>• 500 mAh internal LiPo<br/>• Can be extended with S3 Bottom3"]
IP2["Core2 / Core Fire / M5GO / Core2 AWS<br/>• Internal battery in Core or base<br/>• Capacity depends on kit"]
IP3["M5StickC PLUS / PLUS2<br/>• Small internal LiPo<br/>• USB-C charging"]
IP4["Most ATOM devices<br/>• No internal battery<br/>• USB power by default"]
end
subgraph StackableBattery["Stackable Battery Modules (Classic 5×5 only)"]
SB1["Battery Module (Core)<br/>• 5×5 cm stack module<br/>• Extra capacity<br/>• Compatible with Core/Core2/Fire/M5GO/AWS"]
SB2["High-capacity Battery13.2<br/>• Large stack battery<br/>• For long runtime<br/>• Increases stack height"]
SB3["M5GO Bottom / Bottom2<br/>• RGB bar + battery + ports<br/>• Kit-specific for Core/Core2/Fire/AWS"]
SB4["Base AAA Battery Holder<br/>• AAA battery holder<br/>• Alternative power for Core<br/>• Classic 5×5 stack"]
end
subgraph AtomBattery["ATOM Battery Options"]
AB1["Atomic Battery Base (TailBat)<br/>• ~200 mAh LiPo<br/>• Clips to ATOM footprint<br/>• USB-C charging"]
end
subgraph StickBattery["Stick Battery Options"]
STB1["M5StickC 18650 Base<br/>• 18650 battery holder<br/>• Extended runtime for StickC<br/>• Larger capacity than internal LiPo"]
end
subgraph ExternalPower["External Power (Universal)"]
EP1["USB Power Bank<br/>• Plug into USB-C<br/>• Works with all devices"]
EP2["Bench Supply / Adapter<br/>• 5 V / 3.3 V regulated<br/>• For lab setups"]
end
subgraph PowerControl["Power Control / RTC"]
PC1["M5Stamp Timer Power (BM8563)<br/>• Li-ion charging<br/>• 3.3/5 V output<br/>• RTC alarms<br/>• Full power gating"]
end
%% Relationships
IP1 --> EP1
IP2 --> EP1
IP3 --> EP1
IP4 --> EP1
SB1 --> IP2
SB2 --> IP2
SB3 --> IP2
SB4 --> IP2
AB1 --> IP4
STB1 --> IP3
PC1 --> IP4
PC1 --> IP3
PC1 --> IP2
PC1 --> IP1
Legend:
- InternalPower: built-in batteries
- StackableBattery: classic 5×5 only (includes AAA holder)
- AtomBattery: TailBat/Atomic Base for ATOM
- StickBattery: 18650 base for StickC
- ExternalPower: USB/bulk power
- PowerControl: M5Stamp Timer Power for ultra-low-power designs
flowchart TD
note_P1["P1: Motion + LED Cube<br/>• Focus on IMU + LEDs, optional battery<br/>• Typical combo: ATOM Matrix + Atomic Battery Base"]
note_P2["P2: Sound Cube / Toy<br/>• Short WAV/MP3 sounds<br/>• I²S speaker or built-in speaker<br/>• Motion triggers or button triggers"]
note_P3["P3: RFID Toy<br/>• Use RFID Unit 2 via Grove<br/>• Map tags → sounds, animations, or state changes"]
note_P4["P4: Ultra–Low-Power Node<br/>• M5Stamp Timer Power controls power<br/>• Device runs briefly, then fully powers down"]
note_P5["P5: Touchscreen Multimedia Device<br/>• CoreS3 with audio, cam, IMU, mic<br/>• Suitable for rich UI experiments"]
%% Build patterns
subgraph Patterns["Recommended Build Patterns"]
P1["Motion + LED Cube<br/>(e.g. roll/shake to animate)"]
P2["Sound Cube / Sound Toy<br/>(e.g. short sounds on shake or tap)"]
P3["RFID Toy / Token Reader<br/>(e.g. tag → sound/light)"]
P4["Ultra–Low-Power Node<br/>(e.g. wake occasionally, then power off)"]
P5["Touchscreen Multimedia Device<br/>(audio, graphics, camera)"]
end
%% Devices and key modules
subgraph Devices["Devices"]
D_CoreS3["CoreS3<br/>• Touch + cam + mic<br/>• Speaker + IMU + mag<br/>• Battery"]
D_StickP2["M5StickC PLUS2<br/>• IMU + TFT<br/>• Battery + vib + mic"]
D_AtomMatrix["ATOM Matrix<br/>• 5×5 RGB<br/>• IMU"]
D_AtomEcho["ATOM Echo<br/>• Speaker + mic<br/>• Single RGB"]
D_Timer["M5Stamp Timer Power<br/>• RTC + power gating"]
D_RFID["RFID Unit 2<br/>• Grove RFID reader"]
D_AAtomic["Atomic Battery Base<br/>• Battery for ATOM"]
D_SpkHat["StickC Speaker 2 Hat<br/>• MAX98357 I²S speaker"]
D_Buttons["Mini Dual Button Unit"]
end
%% Pattern connections
%% P1: Motion + LED cube
P1 --> D_AtomMatrix
P1 --> D_AAtomic
%% P2: Sound cube/toy
P2 --> D_AtomMatrix
P2 --> D_AtomEcho
P2 --> D_AAtomic
P2 --> D_StickP2
P2 --> D_SpkHat
%% P3: RFID toy
P3 --> D_CoreS3
P3 --> D_StickP2
P3 --> D_AtomMatrix
P3 --> D_RFID
P3 --> D_Buttons
%% P4: Ultra–low-power node
P4 --> D_Timer
P4 --> D_AtomMatrix
P4 --> D_AtomEcho
P4 --> D_StickP2
P4 --> D_CoreS3
%% P5: Touchscreen multimedia device
P5 --> D_CoreS3
%% Notes connections
note_P1 -.-> P1
note_P2 -.-> P2
note_P3 -.-> P3
note_P4 -.-> P4
note_P5 -.-> P5
Generated with help from LLMs (ChatGPT, Claude, Gemini, Cursor).