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Description
PÚCA DSP is an open-source, Arduino-compatible ESP32 development board for audio and digital signal processing (DSP) applications with expansive audio-processing features. It provides audio inputs, audio outputs, a low-noise microphone array, an integrated test-speaker option, additional memory, battery-charge management, and ESD protection all on a small, breadboard-friendly PCB.
Synthesizers, Installations, Voice UI, and More
PÚCA DSP can be used for a wide range of DSP applications, including but not limited to those in the fields of music, art, creative technology, and adaptive technology. Music-related examples include digital-music synthesis, mobile recording, Bluetooth speakers, wireless line-level directional microphones, and the design of smart musical instruments. Art-related examples include acoustic sensor networks, sound-art installations, and Internet-radio applications. Examples related to creative and adaptive technology include voice user interface (VUI) design and Web audio for the Internet of Sounds.
Compact, Integrated Design
PÚCA DSP was designed for portability. When used with an external 3.7 V rechargeable battery, it can be deployed almost anywhere or integrated into just about any device, instrument, or installation. Its design emerged from months of experimentation with various ESP32 development boards, DAC breakout boards, ADC breakout boards, Microphone breakout boards, and audio-connector breakout boards, and – despite its diminutive size – it manages to provide all of that functionality in a single board. And it dos so without compromising signal quality.
Specifications
Processor & Memory
- Espressif ESP32 Pico D4 Processor
- 32-bit dual core 80 MHz / 160 MHz / 240 MHz
- 4 MB SPI Flash with 8 MB additional PSRAM (Original Edition)
- Wireless 2.4 GHz Wi-Fi 802.11b/g/n
- Bluetooth BLE 4.2
- 3D Antenna
Audio
- Wolfson WM8978 Stereo Audio Codec
- Audio Line In on 3.5 mm stereo onnector
- Audio Headphone / Line Out on 3.5 mm stereo connector
- Stereo Aux Line In, Audio Mono Out routed to GPIO Header
- 2x Knowles SPM0687LR5H-1 MEMS Microphones
- ESD protection on all audio inputs and outputs
- Support for 8, 11.025, 12, 16, 22.05, 24, 32, 44.1 and 48 kHz sample rates
- 1 W Speaker Driver, routed to GPIO Header
- DAC SNR 98 dB, THD -84 dB (‘A’ weighted @ 48 kHz)
- ADC SNR 95 dB, THD -84 dB (‘A’ weighted @ 48 kHz)
- Line input impedance: 1 MOhm
- Line output impedance: 33 Ohm
Form Factor and Connectivity
- Breadboard friendly
- 70 x 24 mm
- 11x GPIO pins broken out to 2.54 mm pitch header, with access to both ESP32 ADC channels, JTAG and capacitive touch pins
- USB 2.0 over USB Type C connector
Power
- 3.7/4.2 V Lithium Polymer Rechargeable Battery, USB or external 5 V DC power source
- ESP32 and Audio Codec can be placed into low power modes under software control
- Battery voltage level detection
- ESD protection on USB data bus
