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--- en:extensions:extbuttons [2018/02/19 11:41] – kniwwelino
+++ en:extensions:extbuttons [2018/02/20 14:51] (current) – [Connecting external buttons with silicon wire] kniwwelino
@@ Line 1: / Line 1: @@
+===== Adding external buttons =====
+External buttons are buttons which can be connected to the Kniwwelino in addition to the buttons A and B already available on the board. Similarily as for the LEDs (cf. [[en:extensions:extled|]]), those are connected through the pins on the outer area.
+To work with external buttons, you need additional material: the buttons, as well as wire to create a closed circuit using the pins of the Kniwwelino.
+With the Kniwwelino Blocks, you can then detect when current is flowing, i.e. when the button is pressed.
+Connecting external buttons is very similar to connecting external LEDs: you can use either alligator clips or wire.
+==== Connecting external buttons with alligator clips ====
+You need:
+  * Buttons
+  * Alligator clips in black and one other color
+To connect the button:
+  * Take a **black alligator clip** and attach it to the **GND pin** at the top.
+  * The other side of the black clip goes to **one of the legs of the button**.
+  * Take a second alligator clip, and connect it to the leg **next to the one connected with the black clip**.
+  * The other side goes to one of the pins at the bottom, labeled **D5, D6, or D7**.
+In the following image we connected it to the D5 pin with a yellow alligator clip.
+{{:en:extensions:extbutton02.jpg?direct&600|}}
+Now your circuit with one external button is closed. You can now program Kniwwelino to detect when current is flowing through this circuit, which will mean that a button was clicked or is pressed.
+\\
+==== Connecting external buttons with silicon wire ====
+The process for connecting external buttons is very similar to connecting external LEDs. Please refer to section [[en:extensions:extled|]] if you would like to have step-by-step instructions of how to attach such components.
+You need:
+  * boutons in the color(s) of your choice
+  * Silicone wire in black and a second color
+  * Small screws M2 or M2.5
+To connect the button(s):
+  * Cut a piece of the black and colored silicon wire each (using scissors). The length depends on the project you want to use it for.
+  * Take off a part of the silicon protection at both ends (about 1 to 1.5cm). You can simply tear it off with your finger nail.
+  * Wind one end of the **black wire** around **one of the legs** of the button.
+  * Wind one end of the **colored wire** around the **leg next to the previously winded leg** of the button.
+  * Wind the second end of the **black wire** around one **washer**.
+  * Wind the second end of the **colored wire** around one of the **pins D5, D6 or D7** at the bottom of the Kniwwelino.
+  * **Repeat all the above** for each of the buttons you want to connect to the Kniwwelino. You can attach up to 3; in this example we used 3 (third button is not yet connected). Each button is connected to a different pin.
+  * Fix the **washers** of all the buttons with a screw and a nut on the **pin GND**.
+{{:en:extensions:extbutton01.jpg?direct&600|}}
+==== Programming external buttons ====
+You can program the external buttons with the following blocks, listed underneath ''Buttons'':
+{{:en:extensions:extbutton_p1.png|}}
+{{:en:extensions:extbutton_p2.png|}}
+Select D5, D6 or D7, depending on which pin you used to attach the button.
+Use the block as part of an ''if - then'' block to execute blocks when a button was clicked or pressed. For example, this code writes "Hello Kniwwelino" on the matrix when an external button on pin D5 was clicked:
+{{:en:extensions:extbutton_p3.png?direct|}}