49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
# On Pin Pressed
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Start an [event handler](/reference/event-handler) (part of the
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program that will run when something happens, like when a button is
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pressed). This handler works when you press pin `0`, `1`, or `2`
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together with `GND`. When you are using this function in a web
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browser, click the pins on the screen instead of the ones on the
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@boardname@.
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If you hold the `GND` pin with one hand and touch pin `0`, `1`, or `2`
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with the other, a very small (safe) amount of electricity will flow
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through your body and back into the @boardname@. This is called
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**completing a circuit**. It's like you're a big wire!
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```sig
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input.onPinPressed(TouchPin.P0, () => {
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})
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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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* ``name`` means the pin that is being pressed, either `P0`, `P1`, or `P2`
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### Example: pin pressed counter
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This program counts how many times you press the `P0` pin.
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Every time you press the pin, the program shows the number of times on the screen.
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```blocks
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let count = 0
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basic.showNumber(count, 100)
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input.onPinPressed(TouchPin.P0, () => {
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count = count + 1
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basic.showNumber(count, 100)
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})
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```
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### See also
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[@boardname@ pins](/device/pins), [pin is pressed](/reference/input/pin-is-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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