The greatest difficulty in designing the contact pad is emulation: when the flipper itself acts as a key and must be applied to an intercom. Prototypes of the iButton pad in Flipper Zero, which we 3D printed during development About 20 different designs were tested until the right one was found. Finally, the decision was to use 3 spring-loaded pogo pins. Therefore we had to invent our own pad design from scratch, so it could be implemented on a PCB without increasing Flipper’s dimensions. This would have tremendously increased the size of the device. If we used any of the existing solutions, a massive metal button would be sticking out of Flipper with an equally huge reading area next to it. The main problem was the absence of pads for simultaneous reading and emulation on the market. How iButton works in Flipper Zeroĭeveloping iButton pad for Flipper Zero was a painful experience. Despite having the same appearance as a usual key, these devices can be absolutely different. The iButton coin form factor is used not only for common keys with ID but also in climate sensors, devices storing cryptographic keys with inbuilt battery, clock and other cool stuff. iButton key contacts touch an intercom reader If that's the case, you'll have to press the key over one of the walls of the reader. So the outer contours of the key and the reader couldn't touch. Sometimes the key is not read immediately because the contact PSD of an intercom is larger than it should be. When the key reaches the reader, the contacts come to touch and the key is powered to transmit its ID. Internal structure of an iButton: a microchip inside the metal shell The Reader For the frame surrounding it, there are lots of variations from the most common plastic holder with a hole to rings, pendants, etc. Usually, iButton implies the physical form of the key and reader - a round coin with two contacts. What is iButton? iButton key: DATA+ contact in the center of the casing is surrounded by plastic insulation, and the outer part is GND contact In this article, we investigate iButton keys’ configuration from its physics to protocols along with the tricks that can be performed on them with Flipper Zero’s help. In fact, a full-fledged microchip operating on a digital protocol is hidden inside. Even though it is often wrongly referred to as a “magnetic” key, there is nothing magnetic in it. It is also called Dallas Touch Memory or contact memory. IButton is a generic name for an electronic identification key packed in a coin-shaped metal container.
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