labview (serial port from usb)

[raghees4u]

Actually i am working on project which is based on Emg (Electromayography),, bascially i want to receive emg signal from circuit and then some interfacing i want to show Emg signal on Labview software via GUI. I don't understand how i interface data via usb and serial port.

what steps are required for it for data acquisition for labview and for interfacing ? kindly help me out

[Blokk]

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@raghees4u wrote:

Actually i am working on project which is based on Emg (Electromayography),, bascially i want to receive emg signal from circuit and then some interfacing i want to show Emg signal on Labview software via GUI. I don't understand how i interface data via usb and serial port.

what steps are required for it for data acquisition for labview and for interfacing ? kindly help me out

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You are replying to a post which is 2 years old, and even started much earlier. First of all, you should have started a new post, but please define your project requirements in a more detailed/better way:

• "i want to receive emg signal from circuit"
• What kind of circuit you have? If your circuit gives you an analog signal, you need a A/D converter, a DAQ device. To be able to pick the proper DAQ hardware, you need to know several things like: required bit rate (bit resolution of the AD converter), sampling rate (1 Hz, 1 kHz, 1 MHz, ...?), voltage range, etc...
• "i want to show Emg signal on Labview software via GUI"
• If you use a NI hardware, it is very simple to make a LabVIEW code with DAQmx drivers
• "I don't understand how i interface data via usb and serial port."
• Again, specify your hardware: what kind of signal is available from your EMG hardware? Is it a custom (home) made device, or from a company? Why you talk about serial port? I do not think you want to transmit analog EMG signal via serial...

edit: just to clarify: if you need to measure an analog signal, you can pick an appropriate NI hardware, which has for example USB interface. You connect the NI hardware via USB to your PC...

Edit2: After you picked a DAQ hardware, you can use the Biomedical toolkit for LabVIEW to "play" with your EMG signal: http://sine.ni.com/nips/cds/view/p/lang/en/nid/211023

[raghees4u]

Actually i m taking emg signal from surface electrodes placed on body parts and definitly homemade circuit and giving analogue output and i justt want to show this signal on Labview software. 

How can i show this signal without NI DAQ devices?

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@Blokk wrote:

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@raghees4u wrote:

Actually i am working on project which is based on Emg (Electromayography),, bascially i want to receive emg signal from circuit and then some interfacing i want to show Emg signal on Labview software via GUI. I don't understand how i interface data via usb and serial port.

what steps are required for it for data acquisition for labview and for interfacing ? kindly help me out

---

You are replying to a post which is 2 years old, and even started much earlier. First of all, you should have started a new post, but please define your project requirements in a more detailed/better way:

• "i want to receive emg signal from circuit"
• What kind of circuit you have? If your circuit gives you an analog signal, you need a A/D converter, a DAQ device. To be able to pick the proper DAQ hardware, you need to know several things like: required bit rate (bit resolution of the AD converter), sampling rate (1 Hz, 1 kHz, 1 MHz, ...?), voltage range, etc...
• "i want to show Emg signal on Labview software via GUI"
• If you use a NI hardware, it is very simple to make a LabVIEW code with DAQmx drivers
• "I don't understand how i interface data via usb and serial port."
• Again, specify your hardware: what kind of signal is available from your EMG hardware? Is it a custom (home) made device, or from a company? Why you talk about serial port? I do not think you want to transmit analog EMG signal via serial...

edit: just to clarify: if you need to measure an analog signal, you can pick an appropriate NI hardware, which has for example USB interface. You connect the NI hardware via USB to your PC...

Edit2: After you picked a DAQ hardware, you can use the Biomedical toolkit for LabVIEW to "play" with your EMG signal: http://sine.ni.com/nips/cds/view/p/lang/en/nid/211023

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[raghees4u]

Actually i want to know how can i communicate with Labview?

can i use serial port in Emg circuit for data acquisition or usb for this purpose?

[Blokk]

"How can i show this signal without NI DAQ devices?"
You need a hardware anyway. How do you want to interface your analog signal to your computer? So either you use an NI hardware, and it is a straightforward solution, or you try to buy some other device, and it comes with some LabVIEW driver if you are lucky... There are some more crazy things i heard about, like connecting an analog signal into the PC audio line in port... but i fo not know details and useability....

[raghees4u]

can analogue signal be transfered through usb

[Blokk]

"Actually i want to know how can i communicate with Labview?
can i use serial port in Emg circuit for data acquisition or usb for this purpose?"
You said you have a home made circuit. Does it have a serial port developed with the necessary drivers, etc? Does your circuit has a A/D converter?
I think you are not familiar with some basic things... you cannot connect an analog signal to your PC via serial port....

[raghees4u]

Thanks 4  ur replies 

if somehow i develop serial port on circuit and uses A/D convertor and then will it communicate with Labview?

[johnsold]

1. You need to be very cautious with electrodes attached to the body and homemade circuits. Leakage currents of a few tens of microamperes canbe dangerous or even lethal under some conditions when applied to the body through surface electrodes.

2. LabVIEW only works with bytes of digital data in the computer's memory. So you need some kind of equipment to convert the analog voltage coming from your EMG signal conditioning circuits into digital data and to transfer it to the computer.  The conversion is done with a device called an analog to digital converter (ADC).  This may be implemented as external circuitry following the signal conditioner, a DAQ device with analog input capability, or some kind of instrument such as an oscilloscope. The transfer mechanism depends on how the analog to digital conversion is done. Many instruments have USB or serial port communications capability. That capability can be designed and built into the supporting circuits for an external ADC. Some DAQ devices connect via USB. If your EMG circuits have a serial port, you should be able to use that. You will need to install VISA as well as LabVIEW.

Lynn

[Blokk]

haha, it is not that simple 🙂 i recommend you to talk someone who knows electronics and computers...