DeviceReadLatest

DeviceReadLatest[device]

returns the most recently collected default item from a device.

DeviceReadLatest[device,n]

returns a list of the n most recently collected items.

DeviceReadLatest[device,n,param]

returns the n most recently collected values of param.

DeviceReadLatest[device,n,{param1,param2,…}]

returns a list of the most recently collected values of the parami.

Details

  • A device can be specified either by a DeviceObject or by a string representing a device class.
  • Only devices from which data is continuously collected support DeviceReadLatest.
  • DeviceReadLatest is a non-blocking function. It uses data already collected from a device, and does not request additional data.
  • DeviceReadLatest[device,n] may return a list shorter than n elements if not enough pre-collected data is available.
  • DeviceReadLatest[device,n] returns data with the oldest first in the list.

Examples

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Basic Examples  (1)

Continuously read random numbers from a demo device and plot the latest points dynamically:

Remove the task and close the device connection:

Applications  (1)

Configure a weather station device for reading the ambient illuminance:

Collect 100 samples of data while manually orienting the sensor toward and away from a light source:

Stop the scheduled task and close the connection:

Wolfram Research (2014), DeviceReadLatest, Wolfram Language function, https://reference.wolfram.com/language/ref/DeviceReadLatest.html.

Text

Wolfram Research (2014), DeviceReadLatest, Wolfram Language function, https://reference.wolfram.com/language/ref/DeviceReadLatest.html.

CMS

Wolfram Language. 2014. "DeviceReadLatest." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DeviceReadLatest.html.

APA

Wolfram Language. (2014). DeviceReadLatest. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DeviceReadLatest.html

BibTeX

@misc{reference.wolfram_2024_devicereadlatest, author="Wolfram Research", title="{DeviceReadLatest}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/DeviceReadLatest.html}", note=[Accessed: 21-November-2024 ]}

BibLaTeX

@online{reference.wolfram_2024_devicereadlatest, organization={Wolfram Research}, title={DeviceReadLatest}, year={2014}, url={https://reference.wolfram.com/language/ref/DeviceReadLatest.html}, note=[Accessed: 21-November-2024 ]}