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In the previous week, we asked the students which sensor they would want to work. They chose sound sensor, so we decided to do the "Staying on the Table" activity using sound sensor. We tried doing programming our NXT and found out that the sensor is so sensitive that it picks up a minimal sound in the air. Also, since we figured testing and programming the sound sensor might be too simple for the students, so we decided to let them program the NXTs to make a  90-degree turn, when it reaches one corner.

As we  expected, the kids had not much problem testing and programming the sound sensors. The only trouble they had was figuring out if they should put signs, when programming for the sound sensor. We explained that since we would want the car to stop once it reaches certain % of sound in the air, and they adjusted accordingly.

Once they started to program a 90-degree turn, many were confused by the "rotation" and "degree" setting. Many assumed that 1 rotation would mean a full circle by NXT, but in fact, 1 rotation meant a full rotation by the wheel. So it took a while to have the kids understand the concept.

But most of them successfully programmed it to make a turn, although not all of them were 90-degree turns.

We told them that we will work with ultrasound sensor the following week and that their goal is to also program their cars to make a full loop around the table. (so, making four 90-degree turns.)