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Adafruit BrainCraft HAT - Machine Learning for Raspberry Pi 4
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The Adafruit BrainCraft HAT is a Raspberry Pi 4 add-on board designed for machine learning and AI projects at the edge. It combines a display, stereo microph...
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The Adafruit BrainCraft HAT is a Raspberry Pi 4 add-on board designed for machine learning and AI projects at the edge. It combines a display, stereo microphones, audio output, camera connector, user controls, and sensor ports into a single HAT, providing everything needed to build audio and video AI applications.
With a 240×240 IPS TFT display for inference output, stereo microphones for voice input, and a camera connector slot for imaging projects, the BrainCraft HAT supports a wide range of TensorFlow Lite and other ML workloads. A controllable mini fan keeps the Pi cool during intensive inference calculations.
Key Features
- 1.54" IPS TFT Display – 240×240 resolution for displaying text, video, or inference results
- Stereo Microphones – Dual microphone input for voice assistant and audio ML projects
- Stereo Speaker Output – 1W per channel for text-to-speech, alerts, or audio playback
- Stereo Headphone Output – 3.5 mm jack for headphones or powered speakers
- Camera Connector Slot – Pass-through for Raspberry Pi camera cable
- 5-Way Joystick + Button – User interface and navigation control
- 3× RGB DotStar LEDs – Programmable LED feedback
- 2× 3-Pin STEMMA Connectors – PWM pins for NeoPixels, servos, or buttons
- STEMMA QT / Qwiic / Grove I2C Port – Plug-and-play sensor expansion
- Controllable Cooling Fan – Attaches to the bottom to keep the Pi cool during AI workloads
- Hardware Audio Privacy Switch – Completely disables the audio codec when off
Ideal For
- TensorFlow Lite and edge ML inference on Raspberry Pi
- Voice assistants and smart home audio projects
- Computer vision and image classification
- Thermal imaging with STEMMA QT heat sensors (e.g., Grid-EYE, MLX90640)
- Industrial predictive maintenance with vibration/accelerometer sensing
Important: Raspberry Pi 4, camera, speakers, and STEMMA QT sensors are not included.
Package Contents
- 1× Adafruit BrainCraft HAT
- 1× Controllable mini cooling fan
Jargon buster
Plain-language definitions for the technical terms used above.
- Grove
- Grove is a plug-in connector ecosystem for sensors and modules that avoids soldering and jumper wires. Grove compatibility matters because it can make it quicker to add supported I2C devices, as long as the cable and voltage are suitable.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- 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.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- RGB
- Short for red, green and blue, usually referring to an LED that can mix those three colours. It matters because controlling an RGB LED teaches how separate outputs combine to create different colours.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
- TFT
- A thin-film transistor display is a common type of colour LCD used for graphics screens. Knowing a product is for TFTs helps you check that the driver board matches the display’s connector, resolution, backlight, and signalling method.
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