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Cars that are safe

There are some cars which are made to be safe, like in the movie. The main difference: the actual ones use ultrasonic sensors only for backing up. They use radar, which use light in wavelengths that can't be seen, for other purposes. The rest of the way radar works is basically the same. The biggest problems include having the car not warning the driver that he is passing by a lamppost.

This is a post from Alpha Rex. (I'm posting a lot! The other people should be posting some!)

The wires for the NXT are like telephone jacks, with one difference: the snap-connector on top is to one side, not in the center, to prevent kids from connecting their robots to the telephone line.

Brrriiiiing! Brrriiiiiing!

person: Hello?

NXT: Hello.

person: Who is this?

NXT: Alpha Rex.

Ultrasonic sensors

This post will be concerning ultrasonic sensors. They are sensors that project sound that can't be heard and wait for it to bounce off an object and come back. Then it uses the time it takes for it to get back to calculate how far away something is. The biggest problem is that they don't have a huge range, about 0-9 feet (0-3 meters/metres). Also, if the object is not directly in front of the sensor, how far away it can be from in front of the sensor gets smaller the further away from the actual sensor while being detected gets smaller. It is harder to detect fabric and spheres with ultrasonic sensors because fabric might let the sound go through and spheres could deflect the sound in a different direction. Other factors which might affect the readings are: air turbulence, temperature, and humidity.

This is a post from Alpha Rex, A.K.A, the sound effects guy from the movie at the top.

The wires for the NXT are like telephone jacks, with one difference: the snap-connector on top is to one side, not in the center, to prevent kids from connecting their robots to the telephone line.

Brrriiiiing! Brrriiiiiing!

person: Hello?

NXT: Hello.

person: Who is this?

NXT: Alpha Rex.