Here is a simple idea that I often use when I need a quick challenge for speedier teams to work on while they are waiting for the rest of the class. For example, when I’ve asked all teams to make a standard build such as the Robot Educator Model.
The challenge
Program a robot to drive around four chair legs in a “figure 8” pattern.
Equipment required
A four-legged chair or equivalent.
As can be seen in the photo, I usually use a few pieces of tape to mark the starting line and the position of the chair legs.
Teacher notes
Although this is of course a fairly straight-forward challenge, I find it useful for exploring different ways of making a two-wheeled robot turn, including:
- turning on the spot (with both wheels turning in opposite directions),
- one wheel fixed, or
- both wheels moving forward but at different power levels.
Having successfully completed a single “figure 8”, I like to challenge teams to see how many times their robot can perform the circuit without intervention. This raises questions of reliability and repeatability, and leads nicely into a discussion around the limitations of dead reckoning. For more on this topic, see Why Doesn’t My Robot Drive Straight?
Rob Torok
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