Sub-GHz security auditing doesn't need to be expensive or bulky. Meet GateCrasher-CH32V, an ultra-compact, open-source 433MHz RF brute-forcer that fits squarely on your keychain.

Built around the famously cheap CH32V003/CH32V006 RISC-V microcontroller and an off-the-shelf H34A RF transmitter, this project was designed from the ground up to masquerade as a standard garage door remote while packing enough transmission power to audit older, fixed-code 433MHz receivers from a serious distance.