===== Best friends wristband =====
The wristband allows you to send icons or messages to your friends.

{{ :fr:instructions:best_friend_wristband.png?400 |}}

To program this example you need to use the buttons, the matrix and the messages. 

==== Programming ====
You can program the wristband progressively. For each step, add the displayed blocks and put them in the right order. You can then test your program by clicking on {{:en:instructions:play.png?direct&30|}}.

=== Step 1: Showing an image when a button is pressed ===
  * You will say to Kniwwelino: « //If I press button A then show my image// ». Use the following blocks and add them to Kniwwelino loop forever:

{{:en:instructions:wristband03.png?direct|}}{{:en:instructions:wristband01.png?direct|}}

=== Step 2: Show different images when button A or B is pressed ===
  * You will say to Kniwwelino: « //If I press button A then show the first image, but if I press button B then show the second image// ». Add the following blocks:

{{:en:instructions:wristband04.png?direct|}}{{:en:instructions:wristband02.png?direct|}}

=== Step 3: Instead of showing images on your matrix, send them to your friends ===

  * Create a group for your friends with a secret name like  «  mySecretFriends ». Only your friends, using the same name as you, will be able to exchange messages with you. You will say to Kniwwelino : « //Send my messages only to those Kniwwelinos who use the same group name as myself// ». Use the following block at the beginning of your program:

{{:en:instructions:wristband05.png?direct|}}

  * Connect your matrix to receive the messages of your friends. You will say to Kniwwelino : « //Show on my matrix all images which are send to the group of my friends// ». Use the following block at the beginning of your program:

{{:en:instructions:wristband06.png?direct|}}

  * Send the images to your friends. You will say to Kniwwelino: « //Send the images to my friends// ». Delete the violet matrix blocs and replace them with orange messaging blocks.

{{:en:instructions:wristband08.png?direct|}} {{:en:instructions:wristband07.png?direct|}}

==== Solution ====
[[en:instructions:wristband:solution1|]] or open solution in [[https://code.kniwwelino.lu/?xml=examples/bf.xml|KniwwelinoBlockly]]

Print versions available for download in [[en:downloads:start|]].

==== Crafting of the wristband ====


=== Needed material ===

  * 1 piece of cellular rubber 20,5x6cm
  * [optional] 2 small pieces of cellular rubber of a different color
  * minimum 4 brads of 4mm diameter or thread and needle
  * 1 brad of 7 mm diameter or a button
  * Scissors
  * A punch or a cutter

=== Model ===

{{ :fr:instructions:wristband:model_braceleet.png?direct&100 |}}
{{ :fr:instructions:wristband:modele_bracelet.docx |Model}}
=== Instructions ===
  - Download, print and cut the model.
  - Copy the shape of the model on the cellular rubber with a pen and cut it.
  - Attach the Kniwwelino using the brads and the holes of the Kniwwelino.
  - Create two holes on one side of the wristband with the punch.
  - Attach the larger brad on the other side of the wristband.

{{:fr:instructions:wristband:img_0337.jpg?400|}}{{:fr:instructions:wristband:img_0339.jpg?400|}}


{{ :fr:instructions:fin_bracelet_fr.png |}}


==== To go further ====
  * To send a text message to your friends, use the following block:
{{:en:instructions:wristband09.png?direct|}}

  * To change the colour of the RGB LED of the Kniwwelinos in your group of friends, use the following blocks:
{{:en:instructions:wristband10.png?direct|}} {{:en:instructions:wristband11.png?direct|}}