Hackable Magazine [FR], Issue 3 (November, December 2014)

Hackable journal est une e-book des éditions diamond, destiné à des utilisateurs curieux souhaitant découvrir et progresser dans le domaine de l'électronique numérique, de l'utilisation de nano-ordinateur et de l. a. programmation sur carte de sort arduino et cosort. le contenu du journal est conçu pour permettre une mise en pratique directe des connaissances acquises et apprendre tout en faisant.

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Extra info for Hackable Magazine [FR], Issue 3 (November, December 2014)

Example text

Le principe est simple mais lorsqu’on parle de télécommande ceci ne suffit pas. Les infrarouges s’étendent des longueurs d’ondes de 700 nm à 1 mm. La gamme est découpée en trois grandes bandes spectrales (ISO), « proche », « moyen » et « lointain » ou en trois domaines (CIE), IR-A, IR-B et IR-C. Les télécommandes fonctionnent généralement sur des longueurs d’ondes de l’ordre de 940 nm. Retenir cette valeur n’est pas anodin car c’est une caractéristique que doivent respecter émetteur (led) et récepteur pour fonctionner correctement.

Si 2 est en sortie à l’état haut et 3 en entrée, L1 s’allume, • si 2 est en entrée et 3 en sortie à l’état haut, L2 s’allume. Ajoutons mentalement maintenant la broche 4 dans notre petit jeu. Les deux premières affirmations restent exactes, mais s’ajoutent maintenant : • si 2 est à haut et 4 en entrée, L3 s’allume, • si 2 est en entrée et 4 à haut, L4 s’allume, • si 3 est à haut et 4 en entrée, L5 s’allume, • et enfin si 4 est à l’état haut et 3 en entrée, c’est L6 qui s’allume. Voici la partie la plus amusante du projet.

Ainsi, votre smartphone ou votre appareil photo numérique peut capter le rayonnement infrarouge et vous l’afficher à l’écran. Si vous n’en n’avez jamais fait l’expérience, prenez simplement une télécommande classique, pointez-là vers l’objectif en appuyant sur un bouton. Vous devriez voir la led au bout de la télécommande se mettre à clignoter frénétiquement. La couleur que vous voyez, une sorte de violet/ rose, n’est PAS de l’infrarouge. Le rayonnement est capté par le détecteur CMOS derrière l’objectif 42 Hackable Magazine n°3 Au centre, la led IR en activité sur une télécommande Philips telle que vue par l’optique d’un smartphone Galaxy Nexus.

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