Windmill Software

Data acquisition and control

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Thermocouple Monitoring

Thermocouple measurement over USB, Windmill 7 software & free technical support

Sale: Was £730 now just £360!

Monitor 16 thermocouples and voltages, digital I/O and counting. Connect 8 units to 1 PC and monitor 128 thermocouples.

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751: Multifunction Data Acquisition USB Unit

751 Multi-function USB Data Acquisition with Windmill Software: 16 analogue inputs, 32 digital i/o, 8 counters

Sale: Was £595 now just £295!

For 16 differential analogue inputs, 16 digital inputs/outputs and 8 counters. You can connect eight 751s to one PC. With the addition of suitable Microlink 59x conditioning units, you can also monitor thermocouples, strain gauges, pressure transducers and current. Includes Windmill data acquisition software for logging, charting, output control and direct data transfer to Excel.

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Strain Gauge Monitoring

Strain Measurement:  USB Data Acquisition Unit, Strain Gauge Connection Box, Windmill Software, free technical support

Sale: Was £775 now just £475!

Monitor 16 strain gauges, balanced bridges like pressure transducers or voltage signals. Connect 8 units to 1 PC and monitor 128 strain gauges. Readings in microstrain. Zero reference level can be set in Windmill software. Plus digital input & output and counting.

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Best Sellers

Microlink 851: Data Acqusition and Control over TCP/IP

851: 16 Analogue inputs, 32 digital i/o, 8 counters, Windmill software

Monitor voltage, strain, temperature, pressure, current, etc (extra units might be needed); digital I/O, counting. With Windows software, data transfer to Excel, free technical support for life and a money-back guarantee.

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851-SG: Strain Measurement over Ethernet and Internet

851-SG: Strain Data Logger with Digital I/O and Counting

Monitor 16 strain gauges, balanced bridges like pressure transducers and voltage signals; counting; digital input and output. With Windmill software, free technical support for life and a money-back guarantee. Communicates with the PC over TCP/IP (eg Ethernet and Internet).

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750: Low Cost Measurement & Control

750 USB Data Acquistion with Windmill Software: analogue input, digital i/o, counters, free technical support

16 analogue inputs, 16 digital inputs/outputs, 8 counters and Windmill logging and control software: all for £150. Connect up to 8 units to a PC. Data saved in text files, or passed directly to Excel.

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Microlink 840: Versatile Data Logging

DAQ Catalogue | Data Acquisition Hardware: Ethernet and Internet |  Microlink 840: Versatile Data Logging

Microlink 840: Versatile data logging over IoT

Microlink 840: Versatile data logging over IoT

Price: £295.00 (Excluding VAT at 20%)


The Microlink 840 lets you perform a multitude of data acquisition and control tasks, all in one small box. You can use it anywhere on an Ethernet network, over the Internet or via IoT for real-time remote data.

An eight-channel, battery-backed, data logger.

  1. Monitor Digital Sensors, including
    • Flow meters
  2. Monitor Utility Meters, including
    • Electricity meters
    • Gas meters
    • Water meters
  3. Monitor machines, for instance
    • Record percentage on/off times
    • Count items produced
  4. Monitor digital status, for instance
    • Count switch closures
  5. Count
    • Accumulating
    • Frequency
    • Period
    • Pulse width
    • Elapsed time
  6. Monitor analogue transducers, including
    • Pressure
    • Temperature
    • Force
    • Voltage
    • 4-20 mA current
    • Level
  7. Control digital outputs
  8. Raise alarms
    • Alarm on analogue level, on-off state or count
    • Set two alarms on a combination of channels
    • Switch a digital output on alarm, sounding a buzzer or turning on a light for example
    • Notify alarms to a remote PC over Ethernet or Internet
    • Insert a delay before an alarm is triggered, helping prevent false alarms

Remote Data Acquisition and Control

Log data from, and control, a mix of eight digital and analogue signals. Use as a device on the Internet-of-Things via MQTT, plug into a local Ethernet network or use the internet TCP/IP protocol. Monitor and control in real-time. Suitable for mass remote energy monitoring, level detection and status logging making it an incredibly versatile IOT tool.

Utility Meter Monitoring

Log data from gas, electricity and water meters. The Microlink 840 lets you monitor demand in real-time and identify patterns of use.

  • Continuous monitoring, logging and display
  • See consumption in real-time
  • Record total usage and usage over your chosen set intervals, for example each hour's or day's demand
  • Alarm indication on all readings - set thresholds above or below which alarms are triggered and logged
  • Each Microlink 840 can monitor 8 meters
  • Maximum count of over 16 million
  • All data is time-stamped
  • Choose custom engineering units through software, scaling readings into the required units: kilowatt-hours or cubic meters for example
  • Log the counts from the volt-free contacts of your utility meters
  • Works with any meter emitting contact closure pulses

Data can be passed to other software such as Excel spreadsheets, databases and energy management software.


The Microlink 840 offers many counting options:

  • Accumulating counter, eg for utility meter monitoring
  • Frequency counter which measures counts per second, eg for determining the rate of power consumption
  • Period counter which measures the time for a number of cycles to occur, eg for calculating the speed of a conveyor belt
  • Pulse width counter, eg for measuring the duration of an event
  • Elapsed time counter, eg for recording the length of time that a machine is on
  • 16-bit or 32-bit counting: 16-bit allows counting up to 65000; 32-bit allows counting to over 16 million.
  • Set a scale and offset factor to the count from software. For example if the pulses came from a flow meter which produced one pulse for every 50 millilitres, a scale factor of 0.05 would give a reading in litres.

Logged Data

Data can be saved as text, xml, Energy Lens, to a MySQL database and in other formats. MQTT communications allows integration into Internet-of-Things networks.

You can choose the time period over which to store data, every minute or every hour say. For each channel you can save:

  • Maximum value over the logging interval
  • Minimum value over the logging interval
  • Average value over the logging interval
  • Final value of the logging interval
  • Custom calculations on saved data

Logging air pollution data


Max inputs & outputs8
Logging epoch1 minute to 9 hours
Logged valuesMaximum, minimum, average and final value of epoch + custom calculations on data
Counting optionsAccumulating, frequency, period, pulse width, elapsed time
MaximumOver 16 million
On & off time
before a count is logged
Selectable from 1 to 255 millisecs
Count resolution16- or 32-bit
Analogue input range0-3.3 V. Can be made 0-5, 0-10 V or bipolar
CommunicationsMQTT, TCP/IP, Wi-Fi, Internet, Ethernet
Data available in real-time

More Information

For more details please get in touch. You can also download the Data Logger leaflet.

DAQ Catalogue | Data Acquisition Hardware: Ethernet and Internet |  Microlink 840: Versatile Data Logging