Editing Input protection
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− | Most circuits only need to protect up to | + | Most circuits only need to protect up to 600 V. |
"600 V is the arc over voltage of | "600 V is the arc over voltage of | ||
the standard wall outlet. If it's greater than 600 V, it doesn't get to | the standard wall outlet. If it's greater than 600 V, it doesn't get to | ||
your power supply, it arc's over the screws of the oulet." | your power supply, it arc's over the screws of the oulet." | ||
[http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\2001\02\12\204237a] | [http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\2001\02\12\204237a] | ||
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− | == | + | |
+ | == signal input protection == | ||
Alas, people outside the electronics world live in places that have "low humidity" and "carpeted floors". | Alas, people outside the electronics world live in places that have "low humidity" and "carpeted floors". | ||
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A variety of signal input protection circuits: | A variety of signal input protection circuits: | ||
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− | + | resistor | |
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+ | zener | ||
− | + | 2 clamping diodes to plus and minus power rails | |
− | + | 2 Schottky clamping diodes to plus and minus power rails | |
− | + | 2 Schottky clamping diodes to plus and minus power rails, and a resistor. (All 3 components directly connected to the microcontroller input pin; the other end of the resistor connected to the outside world). | |
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− | + | transistor buffer ([http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\2007\03\22\101919a Matt Pobursky]) | |
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[[Reverse Protection Diodes]] (protects against reversed GND and +power) | [[Reverse Protection Diodes]] (protects against reversed GND and +power) | ||
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fuses | fuses | ||
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... or some combination. | ... or some combination. | ||
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