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Windmill Software
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Data Acquisition and Control with Windows Software. Publisher of the Monitor newsletter - ISSN 1472-0221.
Data Acquisition and Control with Windows Software. Publisher of the Monitor newsletter - ISSN 1472-0221.

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Latest issue of Monitor - ISSN 1472-0221 - now up at
http://www.windmill.co.uk/monitor229.html
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In the past we've used the combination of INDEX and MATCH to extract the value of the intersection of a row and column of a data range. But there is more that you can do with this function combination, and we'll look at those options in this tutorial.
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New low-cost device recovers underwater sensor-system moorings
Oceanographic research projects often deploy underwater sensor systems in the sea. These are retrieved from deep water by remotely releasing them from their moorings. However, the mooring anchor, shackles and cables can not be easily recovered.

Australian engineers have therefore developed a ‘retrieval pod’ to enable the recovery of moorings. They attach this directly to the remotely released underwater devices.

The retrieval pods are reusable, require minimal construction skills and can even be assembled from basic equipment available at most hardware or boating stores, making them both convenient and low-cost.
Read more: http://news.scubatravel.co.uk/underwater-sensor-system.html
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Monitor 228 now up

Latest issue of Monitor, the data acquisition and control newsletter, now up at http://www.windmill.co.uk/monitor228.html
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How to find in which cells you've entered a formula

1. Press the Ctrl and G keys to bring up the Go To box.
2. Click the Special button.
3. Choose Formulas and click OK.
4. All cells containing a formula will be highlighted.

More Excel tips at http://www.windmill.co.uk/excel-tips.html
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Computer vision is the answer - using video analytics
The 5 Challenges of Human Sensing Solved
Thiago Teixeira, Gershon Dublon and Andreas Savvide of Yale University and Massachusetts Institute of Technology addressed the increasingly common requirement of computer systems to extract information about the people present in an environment. They pin-pointed five requirements that the most accurate systems need to meet.
http://buff.ly/2uQWleC
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Sensor Sniffs Out Dopey Athletes, Bombs and who knows what else
A light-trapping sensor, developed by researchers at the University at Buffalo, shows promise in the detection of performance-enhancing drugs and airborne particles of explosives.
http://www.sensorsmag.com/components/sensor-sniffs-out-dopey-athletes-bombs-and-who-knows-what-else
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Air Pollution Control Equipment Market To Reach US$21B by 2021
Global demand for air pollution control equipment topped $13.3 billion in 2015 and is projected to reach nearly $21 billion by 2021, according to a report by BCC Research
https://www.bccresearch.com/pressroom/env/air-pollution-control-equipment-market-to-reach-us$21b-by-2021

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How to Trigger Data Acquisition

Anything that causes data collection to begin is known as a trigger. It may be as simple as pressing a button in software. Hardware equipment may also generate a trigger signal, which needs to be fed directly into the data acquisition interface. This is called an External Trigger.

Product literature from data acquisition hardware manufacturers will tell you whether their equipment will accept external triggers, and what form these triggers should take.

Positive Edge or Negative Edge Triggering
The system may be triggered when the external signal passes from a low to a high state: positive edge triggering. Alternatively, it might wait for the signal to change from a high to a low state: negative edge triggering.

Digital Triggers
A trigger can be an analogue or a digital signal. A digital trigger input may be listed as TTL or CMOS compatible. TTL (transistor-transistor logic) is the most commonly used. When the trigger input signal is between 0 and 0.8 V it is considered low, when between 2.0 and 5.5 V high.

Analogue Triggers
Analogue triggers let you use, for example, changes in temperature or strain to initiate sampling. You can program the hardware to be triggered (or to cause a trigger) when an analogue input crosses your chosen threshold. With a flexible system you might set the trigger level as a percentage of the analogue input voltage. If the range was 0-10 V, setting 50 percent would cause a trigger when the signal crossed the 5 V threshold. This is useful when you can choose the hardware range.

Gated Triggering
You can not only start sampling with an external trigger, you can also stop it. When the trigger input leaves the "stop" state, sampling begins. It continues until the trigger signal returns to the stop state. With digital triggers a low signal might be the stop state and a high signal the start state.

For analogue triggers the hardware would need two trigger inputs. One trigger might occur when a high limit is passed with a positive slope (low to high) and one when a low limit is passed with a negative slope (high to low). This lets you record, for example, what happens to a test-rig when an input signal transgresses pre-defined limits.

Trigger Pulse Width
This is the minimum time that the change in trigger signal must be sustained before sampling starts, or stop. Typically this might be 1 millisecond.

Trigger Delay
Some hardware lets you specify a pause between receiving the trigger and sampling starting. This is useful if the software needs to prepare itself to receive data. The delay might be around 20 millisecond.

Pre-Trigger Data
Some hardware can collect data before the trigger arrives. You specify how much of this should be retained. This way you can record events leading up to the trigger.

Read more at http://www.windmill.co.uk/trigger-data-acquisition.html

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