ESP32-C6 Zigbee end device that reads ambient sound levels from a MEMS microphone via I2S and reports normalized RMS amplitude to Zigbee2MQTT.

• MCU: ESP32-C6 (native IEEE 802.15.4 radio)
• Sensor: SPH0645LM4H MEMS microphone (I2S, 16 kHz)
• Protocol: Zigbee Home Automation (0x0104), Analog Input cluster (0x000C)
• Stack: ESP-IDF 5.2+ + Espressif Zigbee SDK ≥1.3.0
• Integration: Zigbee2MQTT

Captures 1024-sample I2S frames at 16 kHz. Applies two-pass DC offset removal, then computes RMS amplitude normalized to [0.0, 1.0]. Reports on significant changes (delta ≥ 0.0005) with a 1 s minimum and 300 s maximum interval.

Prerequisites: ESP-IDF 5.2+, ESP32-C6 devkit, SPH0645LM4H wired to I2S pins

idf.py set-target esp32c6
idf.py build flash monitor

Pair the device to your Zigbee network. The device appears as manufacturer "Electronics Consultants" on the Analog Input cluster in Zigbee2MQTT.

Built by Owen O'Hehir — embedded Linux, IoT, Matter & Rust consulting at electronicsconsult.com. Available for contract and consulting work.