Overview

This project integrates voice control with a standard elevator call button by electrically paralleling the button circuit.

Instead of mechanically pressing the button, the system uses a relay to momentarily short the button terminals, simulating a press.

The system evolved from an external prototype to a fully integrated embedded installation powered directly from the lift’s 24V supply.

Design Constraints

• Unknown elevator control circuitry
• Must not interfere with existing functionality
• Must remain electrically isolated from microcontroller logic
• Must be compact and installation-ready
• Must avoid visible external power sources

Final System Architecture

• ESP32-C3 SuperMini
• Single-channel relay module
• 24V → 5V buck converter
• Parallel button shorting interface