Is there any USB device for simulating

[paawansharmas]

Is there any USB device for simulating...

hi

Is it posiible to generate analog signal from a USB device. The data to be generated as analog signal is stored in usb or PC to which it is connected ?

thanks

 

[f95toli]

An USB-DAQ?

See e.g.
http://www.ni.com/data-acquisition/usb/

Note that DAQs from NI are not what you would call cheap, there are plenty of less pricey alternatives out there.

 

[Xitami]

http://en.wikipedia.org/wiki/Sound_card#USB_sound_cards

 

[sru2]

Try this:

http://www.ebay.com/itm/USB-I-O-Data-Acquisition-DAQ-12bit-ADC-PWM-DAC-SPI-UART-TIMERS-Virtual-Com-Port-/200770095613

 

[kazx9r]

are you trying to control something with the output signal, if so, then you'll need a micro-controller. For pure analog or digital data-acquisition, the other posters are on the right track, I've used this $20 piece before. dataq d-155.

 

[sru2]

You can write applications that replace the microcontroller with this DAQ.

http://www.ebay.com/itm/USB-I-O-Data-Acquisition-DAQ-12bit-ADC-PWM-DAC-SPI-UART-TIMERS-Virtual-Com-Port-/200770095613

 

[kazx9r]

You can write applications that replace the microcontroller with this DAQ.

http://www.ebay.com/itm/USB-I-O-Data-Acquisition-DAQ-12bit-ADC-PWM-DAC-SPI-UART-TIMERS-Virtual-Com-Port-/200770095613

Yea but only up to like 2 amps or something like that right? I think you would need something like this

http://www.ebay.com/itm/Arduino-Starter-Kit-/220637290400?pt=LH_DefaultDomain_2&hash=item335f01dfa0

 

[sru2]

Yea but only up to like 2 amps or something like that right? I think you would need something like this

http://www.ebay.com/itm/Arduino-Star...item335f01dfa0

As far as I know, most DACs are current limited to 20mA per output anyway. If you needed more current, you would push it to a transistor or relay controlling a larger current. Also, he needs to generate analogue signals and I don't see that mentioned on the Arduino.

I really think a good mid-range DAQ is required, there seems to be a gap in the market.

8 Channels - 4-in/4-out
16/24 bit ADC
2 Msps per channel
USB

Something like this for $100, or so, I think would sell really well.

 

[kazx9r]

yes for for analog, you are correct, I'm thinking of building a controller myself but i'll dig deeper into it later.

 

[paawansharmas]

thanks all.
actually the idea came because of https://www.physicsforums.com/showthread.php?p=3949407#post3949407
So I thought I could pre-generate a fixed length data either in Scilab or Matlab, and
produce the analog signal accordingly.
I also saw ideas using PC/laptop sound card, but that needs conversion of data (csv, xls, txt etc) into mp3, wav format , which I feel is very tough.

any more suggestions appreciated.

 

[sru2]

You described this as "fluctuating DC", but its actually an AC signal according to the Y axis:

http://www.freeimagehosting.net/riz68

If that's voltage on the left, then this image can be done in DC:

http://www.freeimagehosting.net/w3jlv

Anyway, it does not matter. Try the box I recommended, it will work with Matlab and Labview:

http://www.ebay.com/itm/USB-I-O-Data-Acquisition-DAQ-12bit-ADC-PWM-DAC-SPI-UART-TIMERS-Virtual-Com-Port-/200771556453