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Rewrote in simple language. Added second example.

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Ron Hale-Evans 2016-06-22 15:19:10 -07:00
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docs/reference/pins/digital-read-pin.md
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# Digital Read Pin # Digital Read Pin
The digital read pin function. Read a **digital** (`0` or `1`) signal from a [pin](/device/pins) on
the micro:bit board.
Digitally read the specified [pin](/device/pins) (``P0``, ``P1``, ``P2``, ...) as digital. **Some pins are also used by the display, read the [pin documentation ](/device/pins) carefully.**
```sig ```sig
pins.digitalReadPin(DigitalPin.P3) pins.digitalReadPin(DigitalPin.P3)
``` ```
### ~avatar
Some pins are also used by the [LED screen](/device/screen).
Please read the [page about pins](/device/pins) carefully.
### ~
### Parameters ### Parameters
* name - the pin name ``P0``, ``P1``, ``P2``, ... * a [string](/reference/types/string) that stores the name of the pin (``P0``, ``P1``, or ``P2``, up through ``P20``)
### Returns ### Returns
* [Number](/reference/types/number) - 0 or 1 * a [number](/reference/types/number) that can be `0` or `1`
### Example: football score keeper ### Example: football score keeper
The following example reads `P0` to determine when a goal is scored. When `P0 = 1`, the code uses `digital write pin` to play a buzzer sound: This program reads pin `P0` to find when a goal is scored. When `P0`
is `1`, the program makes the score bigger and plays a buzzer sound
through `P2` with ``digital write pin``.
```blocks ```blocks
let score = 0 let score = 0
@ -34,7 +42,29 @@ basic.forever(() => {
}) })
``` ```
This program is a remote control for the score keeper program. If you
connect `P1` on the remote control micro:bit to `P0` on the score
keeper micro:bit, you can press button `B` on the remote to buzz and
make the score bigger on the other micro:bit.
```blocks
input.onButtonPressed(Button.B, () => {
pins.digitalWritePin(DigitalPin.P1, 1);
basic.pause(500);
pins.digitalWritePin(DigitalPin.P1, 0);
});
```
#### ~hint
Remember to connect `GND` on both micro:bits together!
#### ~
### See also ### See also
[micro:bit pins](/device/pins), [digital write pin](/reference/pins/digital-write-pin), [analog read pin](/reference/pins/analog-read-pin), [analog write pin](/reference/pins/analog-write-pin), [on pin pressed](/reference/input/on-pin-pressed), [pin is pressed](/reference/input/pin-is-pressed) [micro:bit pins](/device/pins),
[digital write pin](/reference/pins/digital-write-pin),
[analog read pin](/reference/pins/analog-read-pin),
[analog write pin](/reference/pins/analog-write-pin),
[on pin pressed](/reference/input/on-pin-pressed),
[pin is pressed](/reference/input/pin-is-pressed)