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Author Topic: is it possible to power 5volts to a usb and 6.5volts to a multi chip array led  (Read 326 times)
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bradrich86
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« on: October 09, 2012, 12:12:23 pm »
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I am building a task lamp for my product design class at Otis College of Art and Design, and I need to power an LED at 6.5volts, and a usb output plug at 5volts.  is it possible to power these from one arduino? if so, what board would work best?
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CrossRoads
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« Reply #1 on: October 09, 2012, 12:33:16 pm »
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Sure - Connect a 7.2V supply to the barrel jack and bring 6.5V from the Vin pin on the power header to the LED and use an Arduino (Uno) output to control a transistor to connect the 'negative' lead of the LED to Gnd.  (Or 7.5V if you can live with 6.8V and adjust your current limit resistor)
http://www.dipmicro.com/store/DCA-07510

If the USB is only  providing +5 & gnd, connect those to the power header pins.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17

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