SDR Tutorial for Beginners: Hack a toy remote using Gnu Radio

Detailed tutorial in a project based learning manner, on reverse engineering physical layer in radio communication. Viewers learn Gnu Radio through a fun and engaging project. We try to reverse engineer the communication protocol between a wireless remote controller and a toy, learning the functionality of the blocks, and general architecture of digital receivers in the process. Each block I try to explain in detail. Associated gnuradio file: https://github.com/nitrojacob/gr-flows/blob/main/rtlsdr/27mhz_fire_engine_remotecontrol_decoder.grc Previously published as https://youtu.be/4koACEEZMiQ. That was single take, un-edited. Now with 1. Audio filtered to reduce noise 2. Some edits to reduce redundancy especially towards the beginning. Chapters: 00:00 - Introduction 00:49 - Block Diagram 03:19 - Raw SDR Output 06:48 - Identifying Modulation Scheme 09:12 - ASK Demodulation 10:48 - Audio Sink Configuration 12:35 - Demodulator Output 18:39 - Symbol Synchronization 24:55 - Frame decoding using Python Block 30:17 - Frame Decoder Output 33:15 - Nuances of gnu-radio block processing 38:46 - GUI Aspects - Variable, QT GUI Tab Widget 41:16 - Conclusion