Sensors - Ultrasonic Sensors
Ultrasonic sensors send out a "PING" above the hearing range of (most) humans. The time it takes for this signal to reflect back is measured, and calculated into a distance value that is used as input to your project.
Phidgets Sound Sensor
Measures sound across a very wide range, with a frequency range of 100Hz to 8kHz and pressure level from 50dB to 100dB.
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The Parallax PING sensor is cool, but it's more useful when mounted on a servo so it can scan the environment.
More Info...MaxSonar-EZ1
The MaxSonar-EZ1 Ultrasonic Range Finder is a tiny, easy-to-use ultrasonic ranging system that can be easily interface to any microcontroller.
More Info...MaxSonar-EZ0
The MaxSonar-EZ0 is a very tight-packaged, high-sensitivity single-element sonar module. Much like the very popular EZ1 module, the EZ0 offers higher sensitivity and slightly different coverage pattern
More Info...XL‑MaxSonar‑EZ4
The XL‑MaxSonar‑EZ4 has the highest noise tolerance and narrowest beam of any of our indoor sensors. The sensor is designed and calibrated to provide reliable range information to large targets even in environments with strong acoustic or electrical noise
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Here's a low-cost ultrasonic ranger with I2C and serial interface, using a single element, and a 55 degree sensing angle.
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The SRF01 Ultrasonic Range Finder is the latest product from Devantech. It employs Devantech's 2nd generation AutoTune technology which allows ranging all the way down to zero on a single transducer sonar.
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The Devantech SRF05 is a solid, 2-element ultrasonic ranger featuring great range, and selectable 1 or 2 I/O interface
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