This is a quick blog on how to create a usb dongle that only allow you to charge your device without copying data.
The radio in my car accepts usb input. It have a feature that automatically detect usb and try to scan it for audio files to play.
This is a problem, as it interrupts the audio already playing when I only want to attach my phone to charge it.
This is quite simple. The standard USB (1.1, 2) type A connector have 4 pins: Vbus D- D+ GND.
We have to create a new female <-> male connector that only connects Vbus & GND.
Note: fast charging won't work with this setup.
Materials required for this build
- USB Type A female socket: Either strip them or buy them from an electronics store.
- USB Type A male socket: Also widley available.
- Solder iron
- Shrink tubes or 3D Printer + PLA fillaments
- Prepare the USB Type A female/male connector.
- Connect the male & female connectors
- Add a case:
- Heat shrink tubes
- 3D Printed case
Prepare the USB Type A female/male connector
To do this, use your pliers to remove the two middle pins from the connector.
Connect the male & female connectors
Make sure you align the pins correctly. You don't want to link the Vbus to GND. The two white strips should be on opposite direction.
Add a case
This will add structural stability for your dongle.
Using heat shrink tube
I added 3 layers of the tube to give it more strength.
3D print a case
If you have access to a 3D printer you can print this model that will fit:
Do a quick test just to make sure that everything is connected correctly.