Onboard microphone connected to IN1 of the Audio Codec Chip. Both ESP32-WROVER-E Module and Audio Codec Chip are connected to this interface. Note that JTAG cannot be used and should be disconnected by setting Function DIP Switch when MicroSD Card is in operation, because some of signals are shared by both devices. The development board supports a MicroSD card in SPI/1-bit/4-bit modes, and can store or play audio files in the MicroSD card. Serial port: provides access to the serial TX/RX signals between ESP32-WROVER-E Module and USB-UART Bridge Chip. Please note that when JTAG is in operation, MicroSD Card cannot be used and should be disconnected because some of JTAG signals are shared by both devices.

Before using JTAG signals to the header, Function DIP Switch should be enabled. See JTAG Header / JP7 for pinout details. It may be used for debugging, application upload, as well as implementing several other functions, e.g., Application Level Tracing. Provides access to the JTAG interface of ESP32-WROVER-E Module. Please refer to ESP32 LyraT V4.3 schematic for more details. If JTAG is not used and MicroSD Card is operated in the one-line mode, then GPIO12 and GPIO13 may be assigned to other functions. To enable the JTAG Header instead, switches in positions 3, 4, 5 and 6 should be put ON.

By default, the MicroSD Card is enabled with all switches in OFF position. Used to configure function of GPIO12 to GPIO15 pins that are shared between devices, primarily between JTAG Header and MicroSD Card. Green LEDĪ general purpose LED controlled by the ESP32-WROVER-E Module to indicate certain operation states of the audio application using dedicated API. The ESP32-WROVER-E module contains ESP32 chip to provide Wi-Fi / Bluetooth connectivity and data processing power as well as integrates 4 MB external SPI flash and an additional 8 MB PSRAM for flexible data storage. The following list and figure describe key components, interfaces and controls of the ESP32-LyraT board. The block diagram below presents main components of the ESP32-LyraT.ĮSP32-LyraT V4.3 Electrical Block Diagram ¶ Functional Description ¶ The ESP32-LyraT development board is a hardware platform designed for the dual-core ESP32 audio applications, e.g., Wi-Fi or BT audio speakers, speech-based remote controllers, smart-home appliances with audio functionality(ies), etc.

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