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WSAL21621 – 13.3inch Magic Mirror C4/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The 13.3inch Magic Mirror C4 is a mini-computer based on the Raspberry Pi CM4 with an IPS display, capacitive touch surface, and integrated voice control.

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Technical overview

  • Uses a 13.3-inch IPS panel with 1920 x 1080 HD resolution and one-way mirror glass.
  • Integrated CM4 module: 64-bit, 1.5 GHz quad-core processor, dual-band Wi-Fi, and Bluetooth 5.0.
  • Capacitive touch panel made of toughened glass (6H hardness) supporting up to 10 touch points.
  • Includes built-in speaker and microphone; voice recognition uses the Snowboy hotword detection engine.
  • Mounting via 75 x 75 mm spacing holes (M4 screw holes) for wall mounting; includes a stand with a 75° tilt angle.
  • USB2.0 port is disabled by default to save power; enabling it requires adding 'dtoverlay=dwc2, dr_mode=host' to config.txt.
  • For HDMI output, set hdmi_group=2, hdmi_mode=82, and hdmi_cvt 1920 1080 60 6 0 0 0 in /boot/config.txt.
  • Installation involves writing the Raspberry Pi OS to a micro SD card, creating an empty SSH file in the BOOT directory, then booting via SSH or directly with keyboard/mouse.

Commands and examples – verify before use:  

aplay -l
arecord -l
curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt install -y nodejs
git clone https://github.com/MichMich/MagicMirror
cd MagicMirror/
npm install
DISPLAY=:0 npm start
git clone https://github.com/waveshare/MMM-VoiceAssistant.git
cp config/config.js.en ~/MagicMirror/config/config.js
sudo apt-get update && sudo apt-get install python3-dev python3-venv
python3 -m venv env
env/bin/python -m pip install --upgrade pip setuptools wheel
source env/bin/activate
sudo apt-get install swig libatlas-base-dev portaudio19-dev flac
pip3 install PyAudio SpeechRecognition
git clone https://github.com/Kitt-AI/snowboy.git
cd snowboy/swig/Python3 && make
cd ../../examples/Python3
python3 demo.py resources/models/smart_mirror.umdl

Notes and version constraints

  • Google Assistant Service usage is limited to a maximum of 500 requests per day.
  • If the wake word does not work, a new model must be created on the Snowboy website and copied into the ~/MagicMirror/modules/MMM-VoiceAssistant/pi directory.
  • With newer Raspberry Pi OS versions (after October 30, 2021), the USB2.0 port may report an error ('config failed, hub doesn't have any ports!'); removing otg_mode=1 and adding dtoverlay=dwc2,dr_mode=host resolves this.
  • Modifying the lightdm settings requires a reboot to take effect.
  • When using alternative power supplies, ensure that the supply ripple remains within ±5%.

Source and revision record

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