Judd Communications Depth Sensor Manual Download Page 8 | Manualshive

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Judd Communications Depth Sensor Manual Download Page 8

Judd Communications Depth Sensor, Analog Version

1
2
3
4

DIP
Switches

Off/On

1 2 3

Output
Jumper

Pins 1&2, 0 to 5V
Pins 2&3, 0 to 2.5V

Upper
Board

Nylon Bolt

Nylon Bolt

Lower
Board

JC Depth Sensor circuit board assembly

The sensor output has two ranges 0 to 5 volts and 0 to 2.5 volts. The desired range is selected by a jumper
connecting the pin combinations shown in the circuit board illustration. To access the output range
selection jumpers, remove the nylon bolts that hold the upper circuit board in place. Carefully lift the
upper circuit board out of the way, exposing the lower circuit board.

The four DIP switches can be used to configure the sensor to operate in different modes

.

The default

setting is OFF for all four switches.

Dip Switch

Function (switch ON)

1

Free run mode

2

Fast free run mode

3

Temperature compensation disable

4

Hold air temp. output 1 sec. longer

DIP Switch 1

Normally the depth sensor makes one measurement upon power up and then holds the output until it is
powered down. In Free Run Mode, the sensor will make continuous repeated measurements with a pause
of one second between. Only the distance measurement is output In Free Run Mode. Normally, when
using Free Run Mode, the Green Sensor Enable wire would be connected to with the Red wire to +12
Volts so the sensor is enabled continuously. The measurements are made using the error check retry
algorithm so the output is updated every 1.5 to 3.5 seconds.

Free Run Mode is used with systems that need continuous operation. It is also useful when the sensor is
used with a datalogger or control system that can not control the delay between sensor enable and sensor
output measurement.

DIP Switch 2

Fast Free Run Mode works the same as Free Run Mode only the error check retry algorithm is not used.
This allows the sensor to make continuous measurements at a rate of 2 per second. If Temperature
Compensation is turned off (DIP Switch 3), then measurements are made at the rate of 4 per second.

Fast Free Run Mode is used with systems that need quick updates such as robotics and industrial control
operations. This mode can also be used by those who are implementing their own signal processing
algorithms.

DIP Switch 3

Temperature compensation can be disabled by turning ON this switch. With temperature compensation
disabled, the sensor will output a raw distance measurement.

This mode is enabled when a user wants to use an external temperature measurement, for compensation.
To compensate with an external temperature measurement follow these steps:

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Summary of Contents for Depth Sensor

Page 1: ...measuring snow depth or water levels The sensor measures the distance from the sensor to a target The sensor works by measuring the time required for an ultrasonic pulse to travel to and from a target surface An integrated temperature probe with solar radiation shield provides an air temperature measurement for properly compensating the distance measured An embedded microcontroller calculates a te...

Page 2: ... 2 5 Volt Range 0 5 Volt Range Degrees Kelvin 200 degrees Volt 100 degrees Volt The JC Depth Sensor performs multiple echo processing Multiple echo processing dramatically improves the reliability of measurements For each measurement cycle two initial measurements are made If the difference between the two distances is less than 1 centimeter then the second sample is saved and output If the differ...

Page 3: ...igh Brown Output Low Differential input Low When single ended inputs are used the Brown lead is not used SENSOR PROGRAMMING The following steps show how to make temperature and depth measurements with the JC Depth Sensor 1 Turn on the sensor by applying a 5 to 12 Volt control signal to the green lead 2 Wait for 800 milliseconds for the depth sensor to warm up and output a temperature measurement 3...

Page 4: ...nterval 01 P End Table 2 Subroutines 3 Table 3 Subroutines Assign the depth sensor subroutine a number note that this number and the calling number need to be the same 01 P85 Beginning of Subroutine 01 1 Subroutine Number Turn ON the depth sensor 02 P86 Do 01 41 Set high Port 1 Wait 0 8 seconds for the sensor to output the Air Temp 03 P22 Excitation with Delay 01 1 EX Chan 02 80 Delay w EX units 0...

Page 5: ...be mounted at least half the distance of the beam diameter or 1 95 meters away from the mast Be careful to avoid obstructed beam paths To determine the minimum distance the sensor must be mounted away from the mast use this formula Crossarm length 194 x Height Depth Sensor Beam Width Examples Perpendicular to Surface The JC Depth Sensor must be mounted perpendicular to the target surface Mounting ...

Page 6: ...should be mounted 4 6 feet away from any vertical supporting structure A good rule of thumb is 2 feet out for every 10 feet the sensor is mounted above the surface The mounting should be adjusted so that the transducer is held parallel to the snow surface Secure the pipe to the supporting tower by using U bolts or tower clamps Measure the distance from the transducer to the target Write this value...

Page 7: ...Solar Radiation Shield on the bottom of the sensor is made of white PVC plastic and will yellow after several years of exposure to ultraviolet light The shield is easily removed by gently twisting it counter clockwise to unscrew it Replacement fittings can be obtained from any plumbing supply store or ordered from Judd Communications Check the shield periodically for discoloration and to make sure...

Page 8: ...Mode Normally when using Free Run Mode the Green Sensor Enable wire would be connected to with the Red wire to 12 Volts so the sensor is enabled continuously The measurements are made using the error check retry algorithm so the output is updated every 1 5 to 3 5 seconds Free Run Mode is used with systems that need continuous operation It is also useful when the sensor is used with a datalogger or...

Page 9: ...ystems and dataloggers want to know minimum and maximum range values instead of scale multipliers These values do not denote the actual maximum range of the sensors Distance Scale Minimum Maximum Inches 0 492 15 Centimeters 0 1250 Air Temperature Scale Minimum Maximum Degrees Kelvin 0 500 WARRANTY The Judd Communications Depth Sensor is warranted by Judd Communications to be free of defects in mat...

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