DeviceRead

DeviceRead[devobj]

reads a single default item from the open device corresponding to the specified DeviceObject.

DeviceRead["devclass"]

reads from the default device in the class "devclass".

DeviceRead[device,param]

reads the parameter param from the specified device.

DeviceRead[device,{param1,param2,}]

reads the list of parameters parami from the specified device.

Details

  • DeviceRead is a blocking function; when called, it communicates with the device and does not return until it has the data it needs.

Examples

open allclose all

Basic Examples  (2)

Open a demo device and read from it:

Read a particular parameter:

Read a parameter from a device of the "RandomSignalDemo" class:

Read a list of parameters:

Applications  (3)

Read a single frame from the default camera:

Close the connection to the camera:

Open a connection to a weather station device, configure it, and read in the ambient humidity:

Close the device:

Configure pin 17 of a GPIO device, e.g. on Raspberry Pi, for reading and read the digital value on it:

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

Text

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

BibTeX

@misc{reference.wolfram_2020_deviceread, author="Wolfram Research", title="{DeviceRead}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/DeviceRead.html}", note=[Accessed: 02-December-2020 ]}

BibLaTeX

@online{reference.wolfram_2020_deviceread, organization={Wolfram Research}, title={DeviceRead}, year={2014}, url={https://reference.wolfram.com/language/ref/DeviceRead.html}, note=[Accessed: 02-December-2020 ]}

CMS

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

APA

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