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adding lessons to create circuit using aluminium foil

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Peli de Halleux
2016-10-13 12:52:47 -07:00
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docs/device/crocodile-clips.md
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# crocodile clips
The large holes at the bottom of the board are designed to attach alligator/crocodile clips.
Register an event that will execute whenever the user attaches one side of the crocodile clip to the `GND` pin, then connects and disconnects the unattached side of the crocodile clip to pin `0`, `1`, or `2`.
The large holes at the bottom of the board are designed to attach alligator/crocodile clips
to create electrical circuit with other components.
### Example: on pin pressed with random numbers
# ~hint
This example displays a random number every time the crocodile clip holds `GND` then connects and disconnects the `P0` pin. Each time the crocodile clip is firmly connected and disconnected from pin `P0`, the micro:bit will return a random Number between 0 and the parameter limit
**No crocodile clips!?!?!** Use wires or Aluminium foil! [Read more...](/device/foil-circuits)
# ~
## Connecting Crocodile Clips
The hole for ``P0`` and ``GND`` allow to grab the board on the side which makes for a great grip.
![](/static/mb/device/croc-clips/crocclipsclamped.jpg)
Pass one jaw in the hole and grab the side of the board with the other jaw.
![](/static/mb/device/croc-clips/sideclamp.jpg)
For the center holes, ``P1`` and ``P2``, you can also grab the bottom of the board but they are a bit harder to grip.
You can also grip the board between the jaws. In which case, you will want to make sure to avoid overlapping the jaws
with the other pins as it will create short-circuit in the board.
![](/static/mb/device/croc-clips/badclamp.jpg)
Adding a little tape helps keeping the crocodile clips in place.
![](/static/mb/device/croc-clips/frontclamp.jpg)
## Example: on pin pressed with random numbers
This example displays a random number every time the crocodile clip holds `GND` then connects and disconnects the `P0` pin.
Each time the crocodile clip is firmly connected and disconnected from pin `P0`, the micro:bit will return a random Number between 0 and the parameter limit.
```blocks
input.onPinPressed(TouchPin.P0, () => {
@ -13,11 +42,6 @@ input.onPinPressed(TouchPin.P0, () => {
})
```
### Connecting Crocodile Clips
![](/static/mb/crocodile-clips-2.jpg)
### See also
[micro:bit 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)
## See also
[micro:bit pins](/device/pins)