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Open Hardware/Modding: Arduino-based Pino Tuner, Picovoice Cobra Voice Activity Detection, and Halloween-Themed Talking Clock

Submitted by Roy Schestowitz on Thursday 28th of October 2021 10:15:26 PM Filed under
Hardware
  • Low-cost, highly accurate piano tuner made with an Arduino Due | Arduino Blog

    Electronic instrument tuners have existed now for several decades, but the ones with a great amount of precision can cost over a thousand dollars to the consumer, which is far above what many are willing or able to pay. To address this issue of high prices while still maintaining a high degree of accuracy, Jan Herman built his own device that utilizes just a few relatively common parts.

    Within the housing of his tuner is an Arduino Due, which was selected because of its 32-bit architecture (for precision when measuring frequencies), faster speeds, and a large amount of GPIO pins. Apart from that, Herman included an AD9833 waveform generator breakout, a PAM8302 amplifier circuit, a pair of rotary potentiometers and switches for getting user inputs, and a transducer/speaker setup along with various passive components for power input.

  • Picovoice Cobra Voice Activity Detection Engine shown to outperform Google WebRTC VAD - CNX Software

    Picovoice Cobra Voice Activity Detection (VAD) engine has just been publicly released with support for Raspberry Pi, BeagleBone, NVIDIA Jetson Nano, Linux 64-bit, macOS 64-bit, Windows 64-bit, Android, iOS, and web browsers that support WebAssembly. Support for other Cortex-M and Cortex-A based SoCs can also be made available but only to enterprise customers.

    Picovoice already offered custom wake word detection with an easy and quick web-based training and offline voice recognition for Raspberry Pi, and even later ported their voice engine to Arduino. Cobra VAD is a new release, and, like other VADs, aims to detect the presence of a human voice within an audio stream.

  • Halloween-Themed Talking Clock Relies On Pi Pico | Hackaday

    Many of us learn to read clocks at a young age, however, talking clocks eliminate the need to do that entirely. [Alberto] whipped up one of his own, in this case designed with some Halloween holiday spookiness.

    A basic clock movement is used to display the time in the typical fashion. However, the movement also features a built-in trigger signal, which it sends to an attached microcontroller on the hour, every hour. The build relies on the Raspberry Pi Pico for sound, chosen for its USB programming interface and its 2 MB of onboard flash storage. Sound is stored in simple 16-bit WAV files, and played out to a speaker via a PWM output. Alternatively, a CircuitPython version of the code is available that uses MP3s instead. A light sensor is used to avoid triggering any sounds at night time that could disturb one’s sleep. The entire circuit can be built on a single-sided board. [Alberto] etched one at home in the old-fashioned way, though one could also order one online, too.

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