How to detect if your robot has collided with a wall or object?
A Micro switch is one of the easiest ways
of letting your robot know that it has collided with something. The
simplest way to do this is to fix a micro switch to the front
of your robot in a way so that when it collides the switch
will get pushed in, making an electrical connection. Normally
the switch will be held open by an internal spring.
Micro switches are easy to connect to micro
controllers because they are either off or on, making them
digital. All micro controllers are digital, so this is a good option.
The
following diagram shows a typical circuit for a micro switch
bump sensor. The resistor is important because it holds the
signal line at ground while the switch is off. Without it the
signal line is effectively 'floating' because there is
nothing connected to it, and may cause unreliable readings as
the processor tries to decide if the line is on or off.
you can get a micro switch easily from
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