Flipper Zero

Introduction Modulation by frequency shift (FSK, Frequency Shift Keying) is a digital modulation technique where binary information is transmitted by varying the frequency of a carrier between two or more discrete values. In its simplest form, 2-FSK, a bit 0 is represented with a specific frequency (f0) and a bit 1 with another (f1). This technique is widely used in low-speed wireless communications, such as remote controls, telemetry systems, RFID, and IoT devices. ...

Introduction The Flipper Zero is a multifunction device for hacking, security testing and radio frequency protocol exploration. One of its most highlighted features is the ability to transmit and receive SubGHz signals, using the Texas Instruments CC1101 chip, a programmable low-power RF transmitter. SubGHz refers to the range of radio frequencies below 1 GHz (typically between 300 MHz and 928 MHz, depending on the region). These frequencies are used by devices such as remote garage door controls or wireless sensors (temperature, movement, alarms). ...

Introduction️ KeeLoq is a security protocol based on a symmetric key cryptographic algorithm that is mainly used in remote control systems, such as garage door remotes and remote access systems for cars. It was developed by Microchip Technology and is widely used due to its low cost and relatively simple implementation.️ KeeLoq implements a “rolling code” system to prevent replay attacks. This means that every time the remote control button is pressed, a unique code is generated that never repeats. The receiver (such as a garage door opener) recognizes this code and validates it against an expected sequence, ignoring any duplicate codes.️ ...

Introduction️ Remote controls by infrared (IR) are electronic devices that use infrared signals to communicate with other electronic devices, such as televisions or air conditioners. The basic operation of an IR remote control is based on the emission of infrared signals from the remote towards an infrared receiver in the device being controlled.️ These signals contain specific codes that are interpreted by the receiving device, causing the corresponding action to be executed, such as turning the device on and off, changing channels, or adjusting volume. The infrared signals generated by the IR LED are modulated, meaning the light intensity is periodically modified according to a specific pattern. This modulation pattern is unique for each button or function on the remote control.️ ...

Introduction️ Between the capabilities of the device Flipper Zero is the decoding of radio protocols below 1 GHz (Sub-GHz) frequencies. One of the available applications is Weather Station that decodes signals from temperature and humidity sensors. Due to the architecture of the application and the nature of the code project it is possible to add new protocols to the application.️ We will add the TWINS protocol based on ThermoPRO-TX4 and Polaroid based on inFactory-TH. We will also observe how to compile the application.️ ...