Background
We’ve received inquiries from customers who want to control access to their premises using a Fabman Bridge, particularly for electric door locks leading outdoors. While the Fabman Bridge is designed primarily for indoor use, there are a few proven solutions that can help you safely manage access without installing the entire device outside.
Option 1: Split the Fabman Bridge
A clever approach that some customers have successfully used is to separate the Fabman Bridge into two parts:
- Outdoor Component: The front panel with the display and logic board.
- Indoor Component: The power board, safely mounted inside.
These two parts are normally connected by a ribbon cable. To install one part outdoors and the other indoors, simply replace the standard ribbon cable with a longer one and route it through the wall. This ensures that the critical power board remains indoors, protected from both weather and tampering.
Recommended Materials (Example)
- Ribbon Cable: For example, Conrad product number 1548655
- Connectors: For example, Conrad product number 742106
You can likely find suitable equivalents at your local electronics distributor.
Enclosures
To house the separated boards, you can 3D-print an additional Fabman enclosure. The original 3D files are available here.
Consider printing one enclosure for outdoor installation (containing the logic board and display) and another for indoor use (containing the power board), then connect them via the extended ribbon cable. For extra durability, you may want to use or design a more weather-resistant enclosure for the outdoor portion.
Important Notes
Weather & Vandal Protection: The standard enclosure isn’t waterproof or vandal-proof. Evaluate local conditions before proceeding. If harsh weather or vandalism is a concern, consider using or designing a more robust outdoor enclosure or go for Option 2.
Option 2: Install the Bridge Behind a Window or Glass Panel
Another simple solution is to mount the Fabman Bridge indoors, directly behind a window or a glass panel accessible from outside. Users can present their RFID cards through the glass, eliminating the need to place any part of the Bridge outside. This approach can be the quickest and most secure option if your building’s layout allows it.
