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Proximity Sensor

We like this infrared proximity sensor from pololu (made by Sharp). It is affordable, but only gives digital (binary) output: something is in front of it or something is not. If you are looking for how far away something might be then you will need to use a more expensive analog sensor. There are infared, sonar, and (if you got lots of $$$ to burn) laser varieties.
Wall-ter is a wall following robot....
Make an interactive light show using a proximity sensor, and a bunsh of shift registers and LEDs....
Two proximity sensors help this bot avoid cliffs....
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