Chapter 13. Table-Bot: An Edge-Avoiding Robot

In this chapter, you’ll build and program Table-Bot, another variation of Inventor-Bot. Table-Bot (Figure 13-1) senses the edge of a table so that it can drive around on the table without falling off. To accomplish this feat, Table-Bot has two antennae, each consisting of a touch sensor and an extension constructed from beams. When the robot approaches the edge of a tabletop, one of the touch sensors becomes pressed. Table-Bot then knows not only that it should back up but also the direction in which it should turn in order to continue driving.

Table-Bot can drive on a table and detect the edges so that it doesn’t fall off.

Figure 13-1. Table-Bot can drive on a table and detect the ...

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