Maya sat back, her chair creaking. The library she had downloaded—that tiny, forgotten ZIP file from an unknown engineer in 2017—had saved her project. She realized that in engineering, success doesn't come from what's pre-installed. It comes from knowing where to look, what to download, and how to install it yourself.

She placed the HT12E on the transmitter sheet, the HT12D on the receiver. She wired the address pins to ground (0x00). She connected a 1MΩ resistor between OSC1 and OSC2 on both ICs. She tied the TE pin of the HT12E to ground, enabling transmission. Then she pressed the first button.

Maya smiled. "It does now, sir."