M5Stack's Perfect Platform for AI Voice Assistants

Are you looking to build your own voice assistant to leverage the latest AI chatbots in your smart home? There are plenty of build guides out there that will help you set up the basic functionality needed for voice interactions with your favorite single-board computer or microcontroller. That part is a solved problem, but getting it to reliably recognize your voice from across the room is tougher. And if you want a device that looks nice in your home — rather than a breadboard and a mess of wires — you’ll need some design skills too.

Or, you could just buy M5Stack’s new Echo Pyramid smart speaker base. It was designed to handle high-quality audio capture and playback, and it has some capacitive touch sliders as well for more advanced user interfaces. It also has some programmable RGB LEDs to add some flair and a mysterious-yet-cool pyramid shape that is reminiscent of M5Stack’s recently released AI Pyramid Pro.

The Echo Pyramid isn’t a standalone device by itself. Instead, it acts as a functional base for M5Stack’s compact Atom-series controllers, including the Atom, AtomS3, and AtomS3R modules — tiny IoT computers built around ESP32 or ESP32-S3 wireless microcontrollers. When paired with one of these modules, the system becomes a complete smart voice interaction platform capable of handling audio processing, wireless connectivity, application logic, and IoT integrations.

One area where the Echo Pyramid excels is reliable far-field voice capture. To accomplish this, the device integrates a high-performance audio pipeline. It is designed around an ES8311 audio codec responsible for playback and recording, paired with an ES7210 microphone acquisition chip that provides acoustic echo cancellation (AEC). Together with the onboard MEMS microphone, this setup helps reduce background noise and eliminate echo from the built-in speaker — important features for accurate voice recognition and full-duplex voice interactions.

Audio output is driven by an AW87559 Class-D amplifier connected to a bottom-mounted speaker, delivering efficient power usage while maintaining clear sound and respectable dynamic range. To keep everything synchronized and minimize signal jitter, the system uses a programmable Si5351 clock generator that supplies the master clock signals for both the ADC and DAC stages. This attention to audio timing can improve both recording clarity and speech recognition accuracy.

Another microcontroller is also present inside the pyramid: the STM32G030F6P6. This auxiliary processor manages the capacitive touch controls and the device’s lighting effects. The dual touch-slider zones on the sides of the pyramid provide four detection points that can be used for gestures such as adjusting volume or skipping tracks. Meanwhile, 28 WS2812 RGB LEDs arranged in four vertical strips provide colorful visual feedback for system states, notifications, or voice assistant responses.

At 84 mm wide and about 57 mm tall, the Echo Pyramid is compact enough for a desk or shelf but large enough to house its speaker and lighting system. With a price around $25 — plus the cost of an Atom controller — it offers a relatively inexpensive starting point for building custom smart speakers, local AI voice assistants, Bluetooth speakers, or IoT voice gateways.