iButton and Dallas Key Reading with Flipper Zero
flipper zeroibuttondallas key1 wire
iButtons (Dallas/Maxim 1-Wire touch keys) are common in apartment buildings, parking garages, and older access control systems. Flipper can read and emulate many of them.
What Are iButtons?
Small metal pill-shaped contacts you touch to a reader. Common for:
- Apartment entry fobs
- Elevator access
- Older parking garages
- Some fuel management systems
Hardware
Reading uses Flipper's bottom 1-Wire connector pins with a simple adapter:
- Or use the official iButton probe accessory (small metal contact on a wire)
- Community 3D printed holders are available on Printables
Reading an iButton
- iButton → Read
- Touch your iButton to the reader contact
- Flipper reads and displays the key type and data
- Save with a name
Supported Types
| Type | Notes |
|---|---|
| Dallas DS1990A | Most common apartment fob |
| Cyfral | Common in Russian/Eastern European buildings |
| Metakom | Similar to Cyfral |
| DS1992 / DS1996 | Memory keys |
Emulating
- Open saved iButton
- Emulate — Flipper presents itself as the iButton
- Touch Flipper's contact to the reader
Works for: Simple fixed-ID keys (most apartment fobs) Does not work for: Encrypted/challenge-response keys (newer systems)
Legal Note
Only emulate keys you own or have permission to use. In many jurisdictions, possessing duplicates of access keys you don't own is illegal.
DIY Reader Probe
You can wire a small metal contact to the GPIO pins for a better physical interface. Search "Flipper iButton probe DIY" for wiring diagrams.