52 lines
1.4 KiB
Markdown
52 lines
1.4 KiB
Markdown
# Pin Is Pressed
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Find whether the pin you say is pressed or not pressed.
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If you hold the `GND` pin with one hand and touch pin `0`, `1`, or `2` with the other,
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a very small (safe) amount of electricity will flow through your body and back into
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the @boardname@. This is called **completing a circuit**. It's like you're a big wire!
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```sig
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input.pinIsPressed(TouchPin.P0);
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```
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## ~hint
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This function works best when the @boardname@ is using batteries for power,
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instead of the USB cable.
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## ~
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## Parameters
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* a [string](/types/string) that holds the pin name (**P0**, **P1**, or **P2**)
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## returns
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* a [boolean](/blocks/logic/boolean) that means whether the pin you say is pressed (`true` or `false`)
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## Pin presses in action
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See how the @boardname@ detects a press at a pin or on something connected to a pin in this video:
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https://www.youtube.com/watch?v=GEpZrvbsO7o
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## Example
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This program shows `1` if `P0` is pressed, and `0` if `P0` is not pressed:
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```blocks
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basic.forever(() => {
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if (input.pinIsPressed(TouchPin.P0)) {
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basic.showNumber(1)
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} else {
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basic.showNumber(0)
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}
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})
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```
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## See also
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[@boardname@ pins](/device/pins), [on pin pressed](/reference/input/on-pin-pressed), [analog read pin](/reference/pins/analog-read-pin), [analog write pin](/reference/pins/analog-write-pin), [digital read pin](/reference/pins/digital-read-pin), [digital write pin](/reference/pins/digital-write-pin)
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