Hi ruijc,
I=E/R so I=5volts /500 ohm coil so I=.01amp or 10 ma. Unless my calculator lied it should work, make sure to install a diode to protect the port from back EMF.
If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
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There simply is no "Happy Spam" If you do it you will disappear from this forum.
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