Go Down

Topic: is it possible to power 5volts to a usb and 6.5volts to a multi chip array led (Read 599 times) previous topic - next topic

bradrich86

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?

CrossRoads

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.
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.
Arduino for Teens available at Amazon.com.

Go Up