Repurposing an old smartphone as a dedicated Android Auto display offers a cost-effective alternative to expensive aftermarket head unit installations. By utilizing software projects like Headunit Revived, drivers can project the Android Auto interface onto a secondary device, eliminating the need for complex dashboard modifications, costly professional labor, or the uncertainty of unverified third-party hardware.
How Smartphone-Based Android Auto Works
The conversion process relies on two primary applications: Headunit Revived, which acts as the receiver, and Wireless Helper, which manages the connection. According to user reports, the setup involves installing the Headunit Revived app on a secondary “receiver” phone—which remains mounted in the vehicle—and the Wireless Helper app on the primary smartphone. Users can establish a connection via a wired USB link for maximum stability or through Wi-Fi Direct for a wireless experience. Once linked, the secondary phone mirrors the Android Auto interface, allowing access to navigation, music, and voice controls without requiring a permanent vehicle modification.
Pro Tip: If you struggle with automatic Wi-Fi Direct pairing, manually enable Wi-Fi Direct in the settings menu of both devices before launching the apps.
Managing Audio Output and Integration
One of the primary concerns for users is audio routing. Because the secondary “head unit” phone is not the primary audio source, users must configure the “Audio sink” setting within the Headunit Revived app. Disabling this feature allows the primary phone to maintain a standard Bluetooth connection with the car’s factory stereo system. This ensures that audio, including music and navigation prompts, plays through the vehicle’s speakers while the secondary phone handles the visual interface. Alternatively, connecting the secondary phone directly to the car’s speakers is possible, though this may require manual source switching on the factory stereo.
Why DIY Displays Outperform Budget Head Units
The decision to use an existing device often hinges on the quality of hardware. Many aftermarket head units priced around $200 come from obscure manufacturers with limited documentation and questionable display quality. By contrast, using a spare phone—such as a Samsung Galaxy A15—provides an LCD screen and a known pedigree for parts and maintenance. Furthermore, software-based solutions offer granular control over performance metrics, such as video codecs and display resolution, allowing users to balance visual fidelity against the processing power of their older hardware.
Did you know? While DIY setups are highly customizable, they lack the integrated hardware features of professional head units, such as dedicated reverse-camera inputs.
Future Trends in In-Car Connectivity
Frequently Asked Questions
- Is this setup free? Yes. Headunit Revived can be downloaded for free from GitHub. A paid version is available on the Google Play Store for those wishing to support the developer.
- Does it work with every car? The software is independent of the car’s electronics. As long as you have a way to mount the phone and provide power, it will function regardless of the vehicle’s make or model.
- Can I use a wired connection? Yes, a wired connection is often more reliable than wireless and is recommended if you experience lag or connection drops.
- Will this affect my phone’s battery?
Have you tried repurposing an old device for your daily commute? Share your configuration tips or questions about the setup in the comments section below.