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Fully interactive robots

Despite the use of sensors being a simple application in itself, they can be used to
build and program robots capable of autonomously performing predetermined
operations that adapt to the surrounding world by exploiting sensor readings.
Therefore, by adding sensors to the previously built two-wheeled robot,
progressively more complex behaviours can be conceived based on conditional
logic, corresponding to specific programming blocks.

Stop with obstacle - ultrasonic sensor

A first example of an interactive mobile robot could involve incorporating an
ultrasonic sensor, capable of detecting the presence and distance of an obstacle.
This can lead to generating code that instructs the robot to perform a specific
movement based on the obstacle's presence condition. Typically, the robot would
start moving and only stop when the sensor detects the presence of an obstacle
closer than a specified threshold.

The construction of robots and their programming can become progressively
more complex, allowing the achievement of behaviours with conditional logic
based on more than one sensor or the various levels of their readings and
thresholds.

For example, one could add a colour sensor to the previous robot, in addition to
the ultrasonic sensor. The movement of the robot could then be conditioned by
both the colour perceived by the sensor (usually positioned downward to

influence its behaviour by colouring the surface it moves on) and the presence of
any obstacles in front of the ultrasonic sensor. An example of a

Funded by the European Union. Views and opinions expressed are however those of the
author(s) only and do not necessarily reflect those of the European Union or the European
Education and Culture Executive Agency (EACEA). Neither the European Union nor EACEA can
be held responsible for them. Proposal number: 101087107.