Essentials of Mechatronics

Chapter 14 - The Human Element

14.1   THE USER INTERFACE

It is no use putting a heap of clever features into a device if the user is not
comfortable with it. It is said that only a very few percent of videotape
machines are ever programmed for automatic recording. So, why have the
sales been so successful? Perhaps it is because a rental tape can be inserted
into the slot and will start to play with no further instructions.

DVD players now perform the playing of rental videos—and they do not
need to be rewound. It will be interesting to see how successful the harddrive-
based videorecorders will be in the long term. It will depend much on
the simplicity of their programming.

14.1.1   What Do the Buttons Do?

Every one of the appliances that we take for granted was once a new product.
There are museum-piece plaques that state; “This room is equipped with
electric light.” It must have been strange to look for the on/off control near
the doorway, rather than a tap on the pipe of a gas lamp. But even today, all
is not so simple. Which way do you move the switch to turn an electric light
on?

An American will immediately say “up,” but in Britain, Australia, and
many other countries, the answer is “down.”

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