USB Fast Charge Power/Data Injector (Android Auto / CarPlay / PC)

Add fast charging to Android Auto or Apple CarPlay — now with a USB-C data port and integrated signal conditioner!
This updated version improves data stability for longer cables, while maintaining full USB Power Delivery 2.0 compatibility.

Perfect for vehicles, laptops, or any setup where one USB port can’t handle both functions.

🔌 Key Features

• Works with Android Auto and Apple CarPlay
• Supports both Lightning and USB-C iPhones
• *USB Power Delivery 2.0 (PD 2.0) compatible
• Three ports: one for your phone, one for your car or PC, and one for your USB-C power source
• Automatic switching between standard 5 V and fast charging
• Status LED indicates connection and charging state
• Compact, plug-and-play design — no setup needed
• USB-C data port replaces the Micro-USB connection for newer cars and PCs
• Built-in signal conditioner improves data signal quality and cable tolerance
• Charge Power Management – Actively monitors voltage and current to prevent low-voltage disconnects.

Other Versions Available

• Micro-USB Data-Port Version:
  USB Power/Data Injector
  Updated design using a micro-USB data port for the car connection. Uses the same power/data injection concept but does not include the USB data redriver used in this USB-C version.

• Original Version (Phasing Out):
  USB Fast Charge V1 Previous design with micro-USB data port and PD 3.0 support.

🚗 Application #1 — Android Auto + Fast Charging

Many vehicles only support Android Auto through an older USB Type-A port, which normally forces you to choose between Android Auto or fast charging.

With this adapter, you can have both:

• Connect your phone
• Connect your car’s Android Auto USB port
• Connect a USB-C PD charger

When the charger is off, standard 5 V charging is used.

When the charger is on, it automatically switches to PD 2.0 fast charging.

🍏 Application #2 — Apple CarPlay + Fast Charging

Use CarPlay and fast-charge your iPhone at the same time. Compatible with Lightning and USB-C iPhones. Just connect your CarPlay USB port, phone, and a USB-C charger.

Use an MFi-certified Lightning cable for reliable performance.

Note: Some cables advertised as “certified” may not support fast charging.

💻 Application #3 — Offload Power from Weak USB Ports

Older computers often can’t supply enough current for modern USB accessories. This adapter lets you offload power to another source while maintaining data with your computer.

Example: Some older laptops limit USB Type-A ports to only 100 mA until a device fully enumerates. Backlit keyboards, scanners, and other accessories often draw more than 100 mA as soon as they’re plugged in, which can overload the port and cause it to shut down. This adapter supplies clean external power to your USB device while keeping the data connection to the computer. Your device gets the power it needs and the laptop port stays protected.

⚙️ Technical Details

• Data port: USB-C (replaces Micro-USB on previous version)
• Integrated signal conditioner on data path for improved stability
• Supports USB Power Delivery Protocol 2.0 (PD 2.0)
• The USB-C power source takes precedence over power provided through the data port
• A maximum of 20 V / 3 A supported for USB-C charging
• A maximum of 5 V / 1 A supported for Micro-USB charging
• Works with “Quick Charge” type chargers (device will negotiate PD 2.0 fast charge; QC will fall back to standard 5 V)
• USB 2.x data supported (USB 3.x devices will operate in 2.x mode)
• Cables not included
• Micro-USB port protected against reverse power flow
• If you require Power Delivery 3.0 (PD 3.0) support and primarily use Android devices, see: 👉 USB Fast Charge V1 (Android Auto / CarPlay / PC)

Charge Power Management

(Available on units running firmware version 17 or newer.) This device monitors both voltage and current going to your phone and automatically adjusts the charging rate to prevent low-voltage conditions. Long or low-quality cables, adapters, or multiple connectors can introduce resistance and cause the voltage to drop, which may lead to Android Auto or CarPlay disconnects.

We recommend short, high-quality cables (100W/5A rated where possible) to minimize voltage loss. If your phone begins drawing more power than the cable can deliver without sagging, this device will detect the drop and gently reduce the charging rate to keep the data connection stable. Most basic injectors cannot do this.

💡 Indicator LED Reference:

📦 Manufacturing Notes

Assembled in the USA from imported parts.

Note: Most common 3D-printing materials warrant a Prop 65 warning. The standard 3D-printed case includes the following warning:

WARNING: This product can expose you to chemicals including benzene, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

An upgraded case option made from Nylon PA12-HP is also available. This material is not listed under California Prop 65, and we are not aware of any evidence suggesting a warning is necessary for it.
If you’d like to print your own case, the latest STL files are available here