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Pisound Micro – All-in-One Hat for Your Audio Hardware Projects

Pisound Micro is a low-latency sound card, MIDI interface, and I/O expansion board optimized for Raspberry Pi.

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Meet Pisound Micro!

A new addition to our Pisound sound card line - Pisound Micro is a low-latency sound card, MIDI interface, and I/O expansion board optimized for Raspberry Pi and similar Single Board Computers*.

This sound card offers low latency, high-quality stereo input and output, a dedicated 1x1 MIDI interface, and an additional 37 GPIOs. It seamlessly integrates into your hardware projects while preserving your SBC's GPIO space.

Plus, the card does not come with pre-soldered connectors, allowing for complete design flexibility.

* We are thoroughly testing other boards and will update the supported SBCs list later on.

Key Features

Audio: High-quality audio via the stereo ADAU1961 codec, delivering 24-bit streams up to 96 kHz with over 98 dB SNR. It offers 6 flexible input pins and 7 output pins for balanced, unbalanced, or mono connections.
MIDI: 4 dedicated pins for MIDI input and output to connect your choice of MIDI T(R)S standard connectors (DIN-5, 3.5mm or 2.5mm). GPIO pins can also be assigned to indicate MIDI activity, ideal for LED feedback.
GPIOs: Access to 37 additional GPIO signal lines, with some tailored for unique tasks such as reading potentiometers or interacting with encoders (12 analog, 25 digital pins).
Pin Availability: Pisound Micro interacts with your SBC through I²S, I²C and two GPIOs only, leaving you plenty of options to connect other peripherals from buttons to OLED displays.

Software Tools

Pisound Micro Mapper
An intuitive tool that allows you to define and map physical controls (such as potentiometers and encoders) to Pisound Micro's I/O pins using a JSON configuration file. This tool can also translate these controls into MIDI and OSC messages and map them to the ALSA mixer controls.
Pisound Micro Mapper Docs
“libpisoundmicro” Library
The libpisoundmicro is a straightforward library written in C/C++ with bindings to other programming languages such as Python. Its purpose is to provide access to the I/O features of the Pisound Micro. This library offers both procedural and object-oriented APIs and enables the detection of GPIO value changes by making use of the Linux File Descriptors, with minimal usage of the host board's CPU resources.
“libpisoundmicro” Docs
Patchbox OS
Patchbox OS is a custom Linux distribution specially designed for Raspberry Pi based audio projects. It comes pre-configured for low latency audio performance and pre-installed audio software that will help you get started with your projects in no time!
Download Patchbox OS
pisound-micro

Specs

Pisound Micro is built for makers. With low-latency performance, flexible GPIOs, and pristine sound, it's perfect for crafting custom instruments, effects, and interactive audio projects. See the full specifications here for a complete breakdown of its capabilities.

Audio Parameters Value
Audio Input 1x Stereo Input (Balanced or Unbalanced)
Audio Output 1x Stereo Output (Balanced or Unbalanced) with Separate Unbalanced Headphone Out
Sampling Rates From 8kHz to 96kHz
Input & Output Resolution 24bit
Signal-to-Noise Ratio > 98dB
Total Harmonic Distortion < 0.02%
Audio Loopback Latency ~ 5ms
MIDI Parameters Value
Input / Output Channels 1x MIDI In, 1x MIDI Out
MIDI Loopback Latency 1.4ms
MIDI Activity LEDs Yes via GPIOs
GPIO Parameters Value
Total Number of Extra GPIOs 37
Of Which Analog Pins (ADC) 12
Analog Pin Resolution 10 bits (Value Range 0 - 1023)
GPIO Loopback Latency 0.5ms
Other Parameters Value
Current Draw 25 ~ 35 mA @ 5.1V DC
Dimensions 56mm x 65mm x 4mm
Weight 13g

Want to Know More?

Head straight to Pisound Micro documentation page or to our community forums. If you would like to contact us directly, please email us at hello@blokas.io!

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