Begginer question, if the output voltage of the raspberry pi is 3.3v and my led voltage is 3.3v, do I still need a resistor? As far as I understand, if the voltage is the same you don't need to add a resistor.
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1How much current will your LED consume at 3.3v ?– MarlaAug 18, 2018 at 14:21
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I think 20 mA..– DanteAug 18, 2018 at 14:25
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What is a 3.3V LED? A resistor is needed to limit current- 16 mA is the maximum for GPIO– MilliwaysAug 18, 2018 at 14:26
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@Milliways: Actually, there are hundreds of 3.3V LEDs– SeamusAug 18, 2018 at 16:30
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1 Answer
A resistor is needed to limit the current flow. If a resistor is integrated with the LED you're using, then you need not add one. But make sure you've got the specification correct; if you don't limit the current, the LED will burn out as it will try to draw as much current as is provided.
