USB device provides immediate data acquisition
An
Audon Electronics product story
Edited by the Engineeringtalk editorial team
Sep 24, 2007
In streaming mode, the U120816 can start streaming data to the PC immediately or upon an external trigger input, selected through software.
The U120816 is a low-cost USB data acquisition module which provides eight single-ended 12bit analogue inputs, 16 digital I/O lines, two programmable pulse-width output channels, and one 16bit counter channel.
The analogue sampling rate is 32ksamples/s maximum, with up to 13ksamples/s for all eight channels.
There are eight single-ended analogue input channels with an input range of 0-4.096V.
The U120816 supports scan and streaming modes for data acquisition.
The user can scan a single channel or scan multiple channels at once.
In scan mode, the execution time is 8ms or 125Hz per channel.
In streaming mode, the U120816 can start streaming data to the PC immediately or upon an external trigger input, selected through software.
In trigger mode, a high state on the trigger line will start the data acquisition.
The maximum throughput of streaming data varies with the number of channels and they are also system-dependant.
Typically this is up to 32ksamples/s for a single channel and 13ksamples/s for all eight channels.
There are 16 bi-directional digital I/O lines in a U120816 module.
Each line is software-configurable to be either input or output high or output low.
At power-up or reset all lines are set to be input by default.
All digital lines are 5V TTL and include a 470ohm series resistor to provide over voltage/short-circuit protection.
Each channel also has a 1M resistor connected to ground.
An external trigger line provides streaming mode data acquisition.
It is software configurable if the user wants to wait for this line.
When in use, as soon as the line goes high, the device will start hardware timed data acquisition.
This is a TTL level input.
There are two 10bit PWM outputs in the U120816.
The PWM outputs can be used to light LEDs, drive motors or convert to analogue outputs by adding an extra circuit.
The U120816 has a 16bit counter.
The software allows the user to decide whether the counter should be reset after the read.
The U120816 is supplied with the iDAQTestandLog application.
This package can be used to test the U120816 device and log analogue input data and read back logged data for basic analysis.
With this software, the user can browse through all the features in the U120816, such as read single analogue channel, multiple analogue channels, streaming analogue input data continuously for display and log into file with or without external trigger, set DIO directions and read/write DIO states, set the PWM output and read the counter.
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