- Reusing an Android tablet allows you to obtain a complete infotainment system with Android Auto without replacing the car's equipment.
- The Headunit Reloaded app turns the tablet into a head unit, receiving the Android Auto interface from the mobile phone via WiFi or USB.
- Proper securing and positioning of the tablet is essential to avoid obstructing visibility and to comply with traffic regulations.
- It is possible to go further by installing Android Automotive on some tablets, creating advanced systems for older vehicles.
If you have a tablet gathering dust in a drawer, you should know that it can be transformed into the central screen of your connected car Without spending a fortune on new multimedia equipment. With a little know-how, a specific app, and some common sense when installing it on the dashboard, you can enjoy Android Auto just like your vehicle is brand new.
The idea is simple: take advantage of your mobile's ability to run Android Auto and use the tablet as secondary screen that acts as main unitThis way you'll have clear GPS navigation, music, hands-free calls and your favorite apps within easy reach, but without touching your phone or getting too distracted while driving.
What exactly is Android Auto and how does it differ from Android Automotive?
Before we get down to business, it's worth clarifying that Android Auto and Android Automotive are not the same thing, even though they sound practically the same and both are designed for cars.
Android Auto It's basically a simplified interface that runs on your Android phone and is displayed on the car's multimedia system screen, either via USB cable or wirelessly. The phone remains the brain; the car's screen simply projects what the phone sends it.
Android AutomotiveIn contrast, it's a complete operating system for cars, developed within the Open Automotive Alliance driven by Google. In this case, the software is installed directly on the vehicle's infotainment unit and is responsible for to bring the entire multimedia system to life autonomously, without depending on the mobile phone. This is what some models from Volvo, Polestar or Lynk & Co. are equipped with, for example.
The interesting thing is that many systems with Android Automotive also bring Built-in support for Android AutoIn other words, you can have Automotive as the car's main system, and if you connect your mobile phone, the familiar Android Auto interface will appear on top, just like any modern Mercedes, Toyota, or Volkswagen system would.
When we use a tablet in the car, it usually emulates the behavior of a unit with Android Auto: the tablet acts as main screen that receives the projection from the smartphoneHowever, some developers have gone further and even installed complete Android Automotive firmware on older tablets to make them function as if they were a native car multimedia hub.
Why it's worth turning your tablet into a car display
The biggest appeal of this invention is that You take advantage of a device you already have And you turn it into a pretty decent infotainment system. There's no need to spend money on dedicated external screens or replace the original sound system if you don't want to.
With this solution you can have an interface in the car very similar to that of modern systems: Google Maps or clearly visible Waze, Spotify or your favorite music app, hands-free calling and voice-controlled messagingAll of this is managed by Google Assistant so you can keep your hands on the wheel and your eyes on the road.
Furthermore, using a tablet gives you several advantages over a separately purchased rear screen: normally You'll have a larger and more flexible diagonal.You can customize apps and settings to your liking, and you can always remove the tablet in seconds to avoid tempting thieves.
It's also a great way to extending the lifespan of tablets that have become outdated for everyday usebut they still have enough power to run current applications. It's a very practical kind of technological recycling, ideal for combating classic planned obsolescence.
And if you enjoy tech DIY projects, building your own car console with a tablet is a great option. A very entertaining DIY project to learn about Android connections, supports, and configurationSome people have driven over 10.000 km with this configuration without any problems, using it daily as their main multimedia center.
The key app: Headunit Reloaded to emulate Android Auto
The trick to making all this work lies in a very specific application: Headunit Reloaded (Headunit Reloaded Emulator)Available on the Google Play Store, this app turns your Android tablet into a head unit compatible with Android Auto.
Its function is to act as a receiver of the signal sent by your Android Auto mobile phone, replicating it on the tablet. same interface you would see on an integrated screen in a modern carIt's not free, it costs around 4,89 euros, but it's often said to be worth every penny if you're going to use it frequently.
To be on the safe side, it's advisable to try the free trial version (if still available) to ensure your tablet is compatible with the app and everything runs smoothly. In some cases, users cover the cost of the purchase using Google Opinion Rewards, obtaining credit on the Play Store by answering surveys and thus minimizing the real cost.
Headunit Reloaded allows you to connect your mobile phone and tablet via USB and WiFiThis gives you a lot of freedom: you can use a cable for maximum stability or use a wireless connection by connecting the tablet to the mobile hotspot.
A very important advantage is the behavior offered by this app. It imitates almost 100% the native Android Auto that you would find in an original car unit: driving-adapted interface, large buttons, voice control, compatible apps and a fairly polished integration.
Minimum requirements: what tablet and accessories do you need
The first thing to understand is that, although it's possible to "revive" very old hardware, you need a tablet that's still in good condition. In other words, It turns on without problems, it has a battery that is not completely dead and be able to connect to the Internet via WiFi or, ideally, with tethering from your mobile phone.
It doesn't need to be the latest model on the market, but it is important that it has a relatively up-to-date operating system and decent performance to run modern applications smoothly. Some have used tablets as old as a Motorola Xoom or a Samsung Galaxy Tab S5e with good results.
You'll also need to get a dashboard bracket compatible with your tablet sizeIt is essential that you can position it securely and without obstructing visibility: magnetic mounts, adjustable arms for the air vent, or bases that rest on the edge of the dashboard can be good options.
Another almost mandatory accessory is a car charger with powerful USB outputcapable of supplying enough power to keep the tablet powered on for long journeys, especially if the screen is quite bright and the GPS is active in the background.
In some projects, the tablet is combined with a radio or main unit already installed, which is responsible for the Bluetooth audio While the tablet acts only as an Android Auto display, the sound is sent to the car's audio system, maintaining physical volume controls and providing better sound quality.
Step-by-step setup: from mobile to tablet
Once you have the app and the right accessories, it's time to set up. The process consists of two parts: preparing Android Auto on your phone and then Link it to the tablet via Headunit Reloaded.
On your Android smartphone, open the system settings and look for the option to Android Auto (You can use the internal settings search by typing "Android Auto"). Enter the corresponding menu to access the full settings.
Scroll until you find the Android Auto version number Tap it several times in a row, as if you were activating the system's developer options. The system will ask for confirmation to enable advanced settings; accept to unlock them.
Once the developer options are available, tap on the icon of the three dots in the upper right corner Then select the "Start master server" option or something similar. This will prepare your phone to send the Android Auto interface to another device.
On the tablet, it starts Headunit Reloaded Then follow the initial setup steps, accepting the permissions it requests (network access, screen, etc.). Make sure the screen is in landscape mode, as Android Auto may appear distorted or poorly scaled if it's in portrait mode.
WiFi and USB connection: how to link your mobile phone and tablet
To use the tablet as a wireless panel, the easiest way is to create a WiFi hotspot from your mobile and connect the tablet to that network. This way, the phone shares its mobile data with the tablet while also providing the Android Auto signal.
On your smartphone, turn off conventional WiFi and turn on the WiFi zone or hotspotSet up a name and password that you can easily remember and wait for the access point to be ready.
Next, go to your tablet and connect it to the new Wi-Fi network created by your phone. Make sure it has internet access and a stable signal. Then, open Headunit Reloaded and select the connection option. "Wireless" on the main screen of the app.
If everything is set up correctly, the tablet will detect the Android Auto server running on the phone and the interface will automatically open on the larger screen. From there, you'll finish completing the Initial Android Auto setup on the phone, accepting access permissions to notifications, calls, contacts and more.
If you prefer a wired connection, you can also connect your phone to the tablet via USB OTG or by using an adapter compatible with the ports of both devices. In Headunit Reloaded, instead of choosing WiFi, you'll opt for the USB option, and the system will behave very similarly, with the advantage of lower latency and fewer interference problems.
Real-world examples and prolonged use in everyday life
Some drivers have been using this configuration for years without major problems. For example, a user with a Maruti Suzuki Ritz with more than 15 years He replaced the basic radio with a 7-inch unit and mounted his five-year-old Samsung Galaxy Tab A7 on top as a secondary screen.
In this case, the car's Bluetooth remains connected to the new radio to manage the audio, while the tablet connects to the mobile phone via a hotspot to run Headunit Reloaded and show Android AutoIt has covered approximately 12.000 km in almost two years with this system without experiencing any serious failures.
The tablet, held with magnetic mounts on the dashboardIt can be attached and detached in seconds, without needing to leave the device in sight when parked. Furthermore, its floating screen design is reminiscent of the solutions seen in many new mid-range and high-end cars.
The key to success in this type of setup lies in planning the position well and ensuring that, even with a large screen, There are no blind spots and no part of the windshield is covered.In the example discussed, the top edge of the tablet was aligned with the sweep area of the windshield wipers, without interfering with visibility.
For many users, this type of DIY tech project becomes a fun way to Learn more about the car itself, about Android, and about device integrationas well as a practical and very economical solution compared to commercial screens.
Android Automotive on tablets: the next level for the most advanced
Beyond simply using the tablet as an Android Auto screen, some developers have managed to install complete Android Automotive firmwares on Android tablets, such as in the case of a Samsung Galaxy Tab S5e.
These types of projects, led by prominent members of the Android community, demonstrate that it is possible to transform a relatively old tablet into a fully functional Android Automotive head unit, even capable of receiving Android Auto from a smartphone connected via USB.
These initial attempts still have limitations: location access may be unstable, Google Maps may fail due to GPS problemsUser profile management is not always complete, and some widgets, such as the weather widget, do not display correct data.
In some cases, one even appears watermark that identifies the hardware as pre-productionThis is obviously not the case in a commercial tablet, but it is part of the peculiarities of these initial ports and the images used.
Even so, the potential is enormous: any old car could eventually have a near-native Android Automotive system simply by having one. dusting off an old tablet and flashing a GSI image (Generic System Image) compatible. These are generic builds designed, in principle, for testing and betas, but which open the door to creative uses on all types of devices.
Secure placement in the car: regulations, supports and common sense
Just as important as Android Auto working well is that the installation is safe and legalPlacing a screen in the middle of the dashboard without any justification is not only risky, it can also cost you a hefty fine.
The first thing to do is choose a tablet from a reasonable size for the interior of your vehicleA screen that's too big can be difficult to position without blocking important areas of the windshield or mirrors, so it's best to err on the side of caution when choosing the screen size.
It is essential that the tablet does not block the view of the road nor interfere with the proper visibility of signs, pedestrians, or vehicles. In some countries, the regulations are very clear: any element that obstructs the driver's vision can result in fines of up to several hundred euros and the loss of points on the driver's license.
You also need to make sure that the tablet is firmly attached to the dashboardA flimsy support or an improvised mounting with tapes could cause the device to fly off in the event of sudden braking or a large bump, with the risk that this implies for the occupants.
Regarding the position, try to position the screen as far away as possible. aligned as possible with your natural field of visionSimilar to how floating screens are positioned in modern cars. Avoid movements that force you to turn your head excessively or take your eyes off the road for longer than necessary.
Tips for using, performing and caring for your tablet
For the experience to be good in the long run, it's worth paying attention to a few details. For example, protect the tablet from extreme temperaturesbecause the inside of the car can become an oven in summer or a freezer in winter.
Whenever possible, avoid leaving your tablet mounted in the car when it will be in the sun for extended periods. Excessive heat not only damages the battery and screen, but can also cause other problems. emergency shutdowns due to overheating just when you need the browser the most.
If you choose a wireless connection, make sure you have a stable hotspot and sufficient data coverageA network outage while you're on a trip can leave you without maps at the worst possible moment. Carrying some offline maps downloaded from Google Maps can be a good idea to minimize surprises.
Another good practice is to check that your tablet has free storage space and updated appsThis helps prevent crashes, forced closures, and compatibility issues that may arise with newer versions of Android Auto or navigation and music apps.
It's a good idea to configure notifications so that Don't let dozens of warnings bombard you while you're drivingUse driving mode or specific Android Auto settings to allow only the essentials, such as important calls or messages from certain apps you really need.
Using an Android tablet as a panel for your connected car is a very practical way to bringing modern infotainment features to older vehicles Without making major investments. With Headunit Reloaded, a little patience during setup, and a secure installation on the dashboard, you can enjoy Android Auto on a generous screen, access maps, music, and voice communications, and, if you feel like going a step further, even tinker with Android Automotive in more advanced projects to get the most out of that device you thought was already retired.
