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Author Topic: Transistors and Resistors  (Read 675 times)
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fungus
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« Reply #15 on: February 16, 2013, 06:56:04 am »
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Quote from: Finnius on February 16, 2013, 12:45:25 am
On a side note - i thought arduino could supply 40ma through the output pins not 20ma as Henry_Best said? And up to an Amp (although i wouldn't) out of the 5v pin?

40mA is absolute maximum, not recommended for daily use.

Quote from: Finnius on February 16, 2013, 12:45:25 am
Also what resistor should i have between the 5v arduino output and the led to stop it drawing more than 350ma? That is the real question for me!!!

The LED needs 1.4V, the resistor therefore has to dissipate the other 3.6V. Use Ohms law.
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« Reply #16 on: February 20, 2013, 07:20:31 pm »
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*bump*
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Nick Gammon
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« Reply #17 on: February 20, 2013, 08:04:04 pm »
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LED calculator
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