Switching 3VDC LED Circuit Using Arduino Uno 5V Digital Output and External Power

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#1 21675009 07 Dec 2015 12:27

Dev Bides Dev Bides

Anonymous

Post #1
21675009 07 Dec 2015 12:27

I want to connect a parallel of leds with my arduino uno i have a 220vac to 3vdc circuit but Adruino digital pin gives output of 5vdc and 50ma for this reason i need this it is urgent please solve
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#2 21675010 07 Dec 2015 20:39

Kevin Angelo Ma Kevin Angelo Ma

Anonymous

Post #2
21675010 07 Dec 2015 20:39

Hi

You could add resistors to the pin output of the UNO. That way you can reduce the voltage to 3V..The actual calculation is the supply voltage minus the LED Vf divided by the desired LED current.
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