Sarah initially connects the TE (Transmit Enable) pin to High. Simulation fail. The HT12E only transmits when TE is low.

This method gives you the symbol but not true encoder/decoder simulation. For full functionality, use Method 1 or 3.

While incredibly useful, the HT12E and HT12D are often of many Proteus software installations. This is a common pain point for engineers and students alike. Without the correct library files, you will see the dreaded error: "Component not found". This guide solves that problem by providing a path to a high-quality, verified third-party library.

Close Proteus completely if it was open during installation.

Match the ground/floating pattern selected on the HT12E.