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44 lines
1.4 KiB
Markdown
44 lines
1.4 KiB
Markdown
---
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title: Logic Nodes
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---
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# #16. Logic Nodes
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<div class="ui segment note">
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<span class="ui ribbon label">Note</span>
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This is a web-version of a tutorial chapter embedded right into the XOD IDE.
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To get a better learning experience we recommend to install the
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<a href="/downloads/">desktop IDE</a> or start the
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<a href="/ide/">browser-based IDE</a>, and you’ll see the same tutorial there.
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</div>
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Boolean values are cool. You can use them to construct complex logic systems.
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In XOD, you will find a lot of nodes for this purpose. All of them are located
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in `xod/core`.
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* `and` returns `true` if both inputs (`IN1` *and* `IN2`) are `true`
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* `or` returns `true` if `IN1`, `IN2`, or both are `true`
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* `xor` returns `true` if only one of `IN1` and `IN2` is `true`
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* `not` inverts the input value
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* `nand` is an inverted `and`
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* `nor` is an inverted `or`
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## Test circuit
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[↓ Download as a Fritzing project](./circuit.fzz)
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In the example patch above the `and` node returns `false` until both buttons
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are pressed. The `not` node inverts the value from the `and` node, so the `LUM`
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pin receives its `true` value (1). Thus, the LED turns on.
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Pressing one of the buttons changes nothing. The LED will turn off only when
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the `LUM` pin receives false (0). This will happen only if the `not` node
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receives the true value, which is possible only if both buttons are pressed at
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the same time.
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[Next lesson →](../17-ldr/)
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