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Pirate Audio: Dual Mic for Raspberry Pi
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Pimoroni
$54.08
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Capture sounds in stereo and store them safely away in your Raspberry Pi with Pirate Audio: Dual Mic. It has a matched pair of I2S microphones, a vibrant ...
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Capture sounds in stereo and store them safely away in your Raspberry Pi with Pirate Audio: Dual Mic. It has a matched pair of I2S microphones, a vibrant high-res colour display, and four tactile control buttons.
This Raspberry Pi mini HAT is perfect for recording stereo audio clips at the click of a button. You could use it as a mini dictaphone for recording important notes, shopping lists, melodies or prophetic dreams, or if you wanted to take it a step further you could use it to capture sounds to analyse with machine learning or even hook it up to Google Assistant or Alexa APIs.
Pirate Audio is a range of all-in-one audio boards for Raspberry Pi, with high-quality digital audio, beautifully-crisp IPS displays, tactile buttons for software control and custom Pirate Audio software.
Features
- 2x SPH0645LM4H-B microphones (datasheet)
-
- High performance SiSonic™ acoustic sensor
- High Signal to Noise ratio of 65dB
- Inbuilt Analog to Digital Converter
- I2S interface
- 1.3" IPS colour LCD (240x240px) (ST7789 driver)
- Four tactile buttons
- Mini HAT-format board
- Fully-assembled
- Compatible with all 40-pin header Raspberry Pi models
- Pirate Audio software
- Dimensions: 31mm x 65mm x 9mm (approx, including screen and header)
Software
We've put together a clip recorder example application to show you how to record audio files and play them back, as well as a convenient installer!
Here's how to get started:
- Set an SD card up with the latest version of Raspberry Pi OS.
- Connect to Wi-Fi or a wired network.
- Open a terminal and type the following:
git clone https://github.com/pimoroni/pirate-audio
cd pirate-audio/clip-recorder
sudo ./install.sh
- Reboot your Pi
(There's more info about what the installer does, what audio plugins we've used and how to install them manually on Github).
Notes
- The buttons are active low, and connected to pins BCM 5, 6, 16, and 24.
- Unlike the other Pirate Audio boards, Dual Mic doesn't have any chunky components on the underside so it will work fine with a Pibow Coupé case without a booster header.
- Please note that Pirate Audio: Dual Mic doesn't have any audio output itself, so if you want to be able to listen back to what you've recorded you'll need to use a full size Raspberry Pi with an audio jack, or some alternative audio arrangement, like a Bluetooth speaker or audio over HDMI. You could potentially also use one of our other Pirate Audio boards for audio output, via something like a HAT Hacker HAT).
Jargon buster
Plain-language definitions for the technical terms used above.
- active LOW
- Active LOW means an input is considered switched on when it is connected to a low voltage or ground. This matters when wiring buttons, switches, or other trigger signals so the board responds in the expected way.
- HDMI
- HDMI is a common digital video and audio connection used by computers, media players, and many displays. If a display kit has HDMI input, it is usually much easier to test with a single-board computer because it can act like a normal monitor.
- I2S
- I2S is a digital audio interface used to send sound data between chips, such as from a microcontroller to an audio amplifier or DAC. It matters if your project needs cleaner digital audio output than a basic buzzer or PWM signal can provide.
- IPS
- IPS is a type of LCD panel that keeps colours and contrast more consistent when viewed from an angle. This matters for small displays that may be mounted in a dashboard, handheld project, or enclosure where the viewer is not always looking straight on.
- LCD
- LCD stands for liquid crystal display, a screen technology that uses a backlight and liquid crystals to show images or text. It matters because LCD modules usually need a display driver and enough controller pins or a bus interface to send image data.
- ST7789
- A display controller chip commonly used to drive small colour TFT screens. If a board uses an ST7789, your software needs a compatible display library or driver to draw text, graphics and images correctly.
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