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Library for controlling the MAX9744 class D amplifier with I2C volume control on a Raspberry Pi or Beaglebone Black.

Project description


This library has been deprecated!

We are now only using our CircuitPython sensor libraries in Python.

We are leaving the code up for historical/research purposes but archiving the repository.

Check out this guide for using the MAX9744 with Python!

Python library for controlling the MAX9744 class D amplifier with I2C volume control on a Raspberry Pi or BeagleBone Black. Made to work with Adafruit's MAX9744 20-watt stereo amplifier board:


Connect the MAX9744 board to your hardware's I2C bus as follows:

On a Raspberry Pi connect:

  • Pi 3.3V power to MAX9744 Vi2c pin.
  • Pi GND to MAX9744 GND pin.
  • Pi SCL to MAX9744 SCL pin.
  • Pi SDA to MAX9744 SDA pin.

Additionally make sure you've enabled I2C on your Raspberry Pi, see:

On a BeagleBone Black connect:

  • BeagleBone Black 3.3V power pin P9_3 to MAX9744 Vi2c pin.
  • BeagleBone Black GND pin P9_1 to MAX9744 GND pin.
  • BeagleBone Black SCL pin P9_19 to MAX9744 SCL pin.
  • BeagleBone Black SDA pin P9_20 to MAX9744 SDA pin.

Make sure you don't have a device tree overlay enabled which might interfere with the BBB's default I2C bus above. See this guide for more information device tree overlays:

Installation & Example Usage

Before you get started make sure you've assembled and tested your MAX9744 board. Follow the guide here for more information:

Make sure your board is connected to the internet, then connect to its command line terminal and run the following commands (assuming a Debian-based operating system like Raspbian on the Pi, or Debian on the BeagleBone Black):

sudo apt-get update
sudo apt-get install -y python-dev build-essential python-smbus git
cd ~
git clone
cd Adafruit_Python_MAX9744
sudo python install

That's it, the library should be installed and ready to use! To run the provided example that demonstrates changing the volume of the MAX9744 run the following commands (from inside the Adafruit_Python_MAX9744 directory where the software was downloaded):

cd examples
sudo python

The example will set the volume to a moderate level (32 out of 63), mute it, and ramp it up and down.

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