# Sixth Lichuang Electric Competition# Offline voice elevator call system is compatible with smart homes

During the current epidemic, elevators have become the focus of epidemic prevention. How to prevent elevator buttons from becoming an intermediary for virus transmission? Offline voice solutions emerge as the times require

From now on, Xiao Ai can also call the elevator.

Mom no longer has to worry about me taking the elevator

This solution uses Qiyingtailun's offline voice chip cl1122 as the core and uses voice input relay output to replace manual touch buttons.

There are many floors in the elevator, and the io of the MCU is not that sufficient.

How to do it?

Thinking hard......

hc573 outputs signals through chip select and bit select, and drives the relay through uln2003

Perfect

Theoretically, hundreds of IOs can be easily expanded, but in practice, more than 30 are enough.

Of course, it’s not just the elevator. Many devices can be controlled.

Controlling every light in the living room is also stable.

So it has very good compatibility