M5StickS3 IoT Dev Kit with Audio Capture & Hi-Fi Output Now Available

The compact and versatile M5StickS3, a programmable IoT development kit, is now available at Marutsu Akihabara in Japan, priced at ¥4,558. This latest iteration builds upon the foundation of the M5StickC Plus2, offering increased memory and improved audio capabilities for a range of remote control and Internet of Things (IoT) applications.

At its core, the M5StickS3 utilizes the ESP32-S3-PICO-1-N8R8 system-on-a-chip (SoC). This provides 2.4 GHz Wi-Fi connectivity, along with 8MB of Flash memory and 8MB of PSRAM – a significant increase from the 2MB of PSRAM found in the previous M5StickC Plus2 model. M5Stack highlights the enhanced scalability and performance enabled by this expanded memory.

From M5StickC Plus2 to M5StickS3: Key Improvements

The M5StickS3 represents a refinement of the M5StickC Plus2, addressing some of its limitations while adding recent features. Beyond the doubled PSRAM and increased flash storage, the new model features an IPS LCD display (compared to the TFT LCD on the Plus2) and a larger 250mAh battery, up from 200mAh. Physically, the device has grown slightly, measuring 48.0 x 24.0 x 15.0mm compared to the Plus2’s 48.0 x 24.0 x 13.5mm, and its weight has increased from 16.7g to 20.0g. These changes reflect the inclusion of additional components and a larger battery capacity.

Perhaps the most notable addition is the integrated audio processing capability. The M5StickS3 incorporates a mono audio codec (ES8311), a high-sensitivity MEMS microphone, and an AW8737 power amplifier. This combination allows for clear audio capture and high-fidelity audio output, opening up possibilities for voice-controlled applications and audio-based IoT projects. However, users are advised to keep speaker volume below 75% when running on battery power to avoid potential device restarts.

Technical Specifications and Core Components

The M5StickS3 packs a considerable amount of functionality into its little form factor. Key specifications include a 1.14-inch display with a resolution of 135×240 pixels, a 6-axis IMU (Inertial Measurement Unit) for motion sensing, a programmable button for custom interactions, and a USB-C port for power and data transfer. The device measures just 48.0 x 24.0 x 15.0mm and weighs 20.0g, making it easily portable and suitable for a wide range of embedded applications.

The ESP32-S3-PICO-1-N8R8 SoC is a dual-core processor based on the Xtensa architecture, running at 240MHz. Marutsu details that the chip features 8MB of Flash memory and 8MB of PSRAM. PSRAM (Pseudo Static RAM) is a type of dynamic RAM that behaves similarly to static RAM, offering faster access times than traditional DRAM, which is crucial for performance in embedded systems. It’s often used to store data that needs to be accessed quickly and frequently, such as images, audio samples, or program code.

Applications and Potential Use Cases

The M5StickS3’s combination of features makes it well-suited for a diverse array of IoT projects. Its compact size and low power consumption build it ideal for wearable devices, remote sensors, and portable data loggers. The integrated 6-axis IMU enables applications involving motion detection, gesture recognition, and orientation sensing. The audio capabilities open doors for voice control, audio monitoring, and sound-based alerts. The 2.4GHz Wi-Fi connectivity allows for seamless integration with existing networks and cloud platforms.

Potential applications include environmental monitoring stations, smart home automation controllers, remote control devices, and educational tools for learning about embedded systems and IoT technologies. The programmable button and display provide a user-friendly interface for interacting with the device and visualizing data. The availability of a robust software development environment, based on the ESP-IDF framework, simplifies the process of creating custom applications.

Considerations and Future Development

While the M5StickS3 offers significant improvements over its predecessor, it’s important to note the recommendation to limit speaker volume when operating on battery power. This suggests a potential trade-off between audio output level and battery life. Further testing and optimization may be needed to address this limitation. The device’s relatively small display size may also be a constraint for applications requiring extensive visual information.

Looking ahead, it will be interesting to notice how the M5StickS3 community leverages its enhanced capabilities to develop innovative IoT solutions. The availability of the device at Marutsu Akihabara provides a convenient access point for developers and hobbyists in Japan. Continued software support and the development of new libraries and tools will further expand the M5StickS3’s potential and solidify its position as a versatile and accessible IoT development platform. AKIBA PC Hotline! reports that the device is a successor to the M5StickC Plus2, and the community will likely build on existing projects and explore new possibilities with the upgraded hardware.