The M5Stack Atomic Audio-3.5 Base adds high-quality voice recognition and audio playback to Atom series controllers, featuring a 3.5mm TRRS audio jack, MEMS microphone, ES8311 audio codec, and full-duplex audio support for smart voice interaction projects. The M5Stack Atomic Audio-3.5 Base is a voice recognition and audio playback base designed for the Atom series controllers (not compatible with Atom Voice). It integrates an ES8311 mono audio codec, a MEMS microphone, and an NS4150B power amplifier, equipped with a standard 3.5mm audio jack and a 4-segment TRRS connector (CTIA standard) to support both audio output and microphone input. The ES8311 supports 24-bit audio resolution with a sampling rate range of 16kHz ~ 64kHz and communicates via the I2S interface, enabling high-fidelity audio processing. The onboard MEMS microphone offers a high signal-to-noise ratio and digital output capability, optimized for automatic speech recognition scenarios, while the integrated speaker delivers efficient audio output. This base supports full-duplex communication for simultaneous audio transmission and reception, making it suitable for applications such as voice assistants, voice control terminals, smart home voice gateways, and voice interaction devices. Features * 3.5mm audio jack supporting audio output + microphone input * Integrated ES8311 high-fidelity audio codec with 24-bit high-resolution audio processing * Full-duplex voice communication with simultaneous audio send and receive * Auto-switching functionality * Onboard audio source ↔ external microphone (auto-switch during playback) * Speaker ↔ external microphone (auto-switch during recording) Specifications Audio Codec ES8311 MEMS Microphone ME1502AM5G Speaker 1W@8Ω NS4150B Audio Interface 3.5mm Headphone Jack (SMID-5P, 5-pin) Voltage Regulator TPS7A2033PDQNR GPIO Expander PI4IOE5V6408ZTAEX Power Consumption Standby Mode: 5V@1.83mA Recording Mode: 5V@12.71mA 50% Volume Playback: 5V@21.19mA 100% Volume Playback: 5V@26.46mA Product Size 48.0 x 24.0 x 17.5mm Product Weight 12.0g Resources * Product documentation Package Contents * 1x Atomic Audio 3.5 Base * 1x Hex Key L-Shape 1.5mm (For M2 Screw) * 1x M2 8mm cap head machine screw Please note that this is not compatible with the Atom Voice.