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The power of State Machines. Gapped and Crossed Line Following with LEGO Mindstorms EV3

There comes a time when you need to program the robot to "follow a line, but if another sensor detects something you would like to stop, do some work, and then continue following the line". This is applicable to competition robots as it is applicable to real-life robots.

There comes the State Machine Pattern. An advanced and very powerful concept that allows you to easily implement complex robot behaviours with a simple, well-organized, extensible, bug-free program where the robot could be in 1,2, 10 or 100 states and you will still be able to manage the complexity of the world around the robot.

The goal of this course is to help mentors and students like Rafa, who recently contacted us with the following question

Rafa

16:05

I'm new to Lego, and little by little I'm learning the programming, this time I want someone to help me in the following: I want the robot to follow a line with sensor 1 and I want sensor 2 to stop in turn and execute an action and then continue and execute another action if you find an object of a specific color, how can I do so that this can be programmed?

Kiril (Me)

16:09
ok -
this is the thing for you - https://www.fllcasts.com/courses/74-the-power-of-state-machines-gapped-and-crossed-line-following-with-lego-mindstorms-ev3
it will take you an hour, hour and a half and it is about following lines with many sensors and detecting gaps and it has a state machine implemented

16:12
The state machine is a concept that helps with exactly this
in every moment the robot is in a state
it could be Follow, Stop, Punch, Move back, etc
for every state you have a specific action
and there is a switch that checks
if the robot is in state X than do action Y

16:13
there is a second part of the program
that determines in what state the robot should be
and this goes in the following way
if sensor 1 detects A than put robot in state 1
else if sensor 2 detect B than put robot in state 2
and so on and so on

Where to use this State Machine Course?

In every robotics competition. FIRST LEGO League and World Robot Olympiad are good candidates because we are using LEGO Mindstorms Robots, but the concept applies to all kind of robots and this is how you generally approach robotics programming.

Enrol in this could and move through this adventure the same way Rafa did. Twist and bend your mind around this State Machine pattern, but come out as powerful as you've never been when it comes to programming robots.