Datasheet

I2CXL-MaxSonar

- EZ™ Series

Page 5

Web: www.maxbotix.com

PD11848k

MaxBotix Inc., products are engineered and assembled in the USA

For the MB1222, MB1232, & MB1242 the sensor minimum reported distance is 20-cm. However, the

I2CXL-MaxSonar-EZ will range and report targets to the front sensor face. Large targets closer than 20-cm will typically

range as 20-cm.

Real-time Noise Rejection

While the I2CXL-MaxSonar

-EZ is designed to operate in the presence of noise, best operation is obtained when noise

strength is low and desired signal strength is high. The user is encouraged to mount the sensor in such a way that

minimizes outside acoustic noise pickup. In addition, keep the DC power to the sensor free of noise. This will let the

sensor deal with noise issues outside of the users direct control (in general, the sensor will still function well even if these

things are ignored). Users are encouraged to test the sensor in their application to verify usability.

For every ranging cycle, individual filtering for that specific cycle is applied. In general, noise from regularly occurring

periodic noise sources such as motors, fans, vibration, etc., will not falsely be detected as an object. This holds true even

if the periodic noise increases or decreases (such as might occur in engine throttling or an increase/decrease of wind

movement over the sensor). Even so, it is possible for sharp non-periodic noise sources to cause false target detection. In

addition, *(because of dynamic range and signal to noise physics,) as the noise level increases, at first only small

targets might be missed, but if noise increases to very high levels, it is likely that even large targets will be missed.

The I2CXL-MaxSonar-EZ series has additional resistance against periodic noise and small target rejection capabilities

over the standard XL-MaxSonar-EZ/AE series.

*In high noise environments, if needed, use 5V power to keep acoustic signal power high. In addition, a high acoustic noise

environment may use some of the dynamic range of the sensor, so consider a part with less gain such as the MB1222, MB1232, or

MB1242. For applications with large targets, consider a part with clutter rejection like the MB7360.

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Target Size Compensation

The I2CXL-MaxSonar-EZ sensors do not apply target size compensation to detected objects. This means that larger size

targets may report as a closer distance than the actual distance or smaller size targets may report as a further distance then

the actual distance.

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Real-Time Auto Calibration

Each time before the I2CXL-MaxSonar-EZ sensor takes a range reading it calibrates itself. The sensor then uses this data

to range objects. If the humidity or applied voltage changes during sensor operation, the sensor will continue to function

normally. The sensor does not apply compensation for the speed of sound change due to temperature to any range

readings. (20C operation is assumed when calculating the speed of sound, other MaxBotix Inc., products are available

with these features)

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Range “0” Location

The I2CXL-MaxSonar-EZ reports the range to distant targets starting from the front of the sensor as shown in the diagram

below.

The I2CXL-MaxSonar-EZ will report the range to the closest detectable object. Target detection has been characterized

in the sensor beam patterns.

The range is measured from the front face of the sensor

Range Zero