12-11-2007 09:01 AM
12-11-2007 09:07 AM
12-11-2007 09:21 AM
I'm developing a portable low-cost setup for fluorescence visualization. I need to use a blue LED (continuously) and a green LED alternatively. I want to use the power of the USB port instead of an external battery. First I thought to switch on/off the green LED using a mosfet transistor controlled by the serial port but the current/voltage characteristic avoid this solution. So I thought that maybe there is an easy way to control the USB power with Labview.
12-11-2007 12:18 PM
12-11-2007 12:23 PM
12-11-2007 01:31 PM - edited 12-11-2007 01:32 PM
12-11-2007 01:54 PM
12-12-2007 03:33 PM
Hello,
I would suggest using a National Instruments USB 6008. I have attached the product page below. Please view the data sheet for this product. If you would like I can also help connect you with an Internal Sales Representative if you post an email or phone number. If not, also feel free to contact National Instruments yourself. I have linked a page with our sales and tech support numbers.
12-12-2007 04:07 PM
robin84 wrote:
I'm developing a portable low-cost setup for fluorescence visualization. I need to use a blue LED (continuously) and a green LED alternatively. I want to use the power of the USB port instead of an external battery. First I thought to switch on/off the green LED using a mosfet transistor controlled by the serial port but the current/voltage characteristic avoid this solution. So I thought that maybe there is an easy way to control the USB power with Labview.
if you were ready to invest into a home built solution using mosfets, there are much simpler solutions, involving a 5V from the serial or parallel port: 5V power supply on a pnp transistor. this will drive any LED you trow at it.
otherwise go for a USB6008 as proposed. very simple, cheap and robust.
12-12-2007 04:34 PM