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EVENTS.md: Add diode isolation image.
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v3/docs/EVENTS.md

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@@ -584,8 +584,8 @@ presses are supported. Items in the array may be switches or pushbuttons,
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however if switches are used they must be diode-isolated. This is because
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pushbuttons are normally open, while switches may be left in open or closed
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states. If more than two switches are closed, unwanted electrical connections
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are made.
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![Image](./isolate.jpg)
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are made. The diodes prevent this.
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![Image](./isolate.png)
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Constructor mandatory args:
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* `rowpins` A list or tuple of initialised output pins.

v3/docs/isolate.png

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