The ACC-EXP-VWC Vibrating Wire Controller is a Wildeye expander that connects your datalogger to any vibrating wire sensor. When taking a reading, it excites the sensor wire and measures the resonance frequency - a technique commonly used in geotechnical and structural monitoring for its stability and long-term accuracy. That frequency data is passed to the logger and made available on the Wildeye platform, where it can be converted to real-world units.
A single ACC-EXP-VWC handles one vibrating wire channel and simultaneously reads the sensor's built-in thermistor, giving you both frequency and temperature.
For full technical specifications, see ACC-EXP-VWC - Vibrating Wire Controller
Getting started
Connect the ACC-EXP-VWC expander to a NACS port on your logger, wire your VW sensor to the labelled terminals, and add the expander to your site using the ACC-EXP-VWC sensor definition in the Wildeye app or web.
Default Inputs
Once added, the expander will report three inputs by default:
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Vibrating Wire Frequency - raw resonant frequency in Hz
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Temperature - thermistor reading in 10× °C (divide by 10 for degrees Celsius)
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Digits - frequency squared divided by 1000 (Hz²/1000), a common intermediate unit used in vibrating wire calculations
Calculated inputs
The raw values above are the basis for deriving real-world measurements. Use Wildeye's Calculated Inputs to convert these into engineering units such as pressure (kPa or psi) or displacement (mm), applying your sensor's calibration factors as supplied by the manufacturer.