Différences entre les pages « Poutres en spaghettis » et « Shield PetitBot »

 
 
Ligne 1 : Ligne 1 :
 
{{Tuto Details
 
{{Tuto Details
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|Main_Picture=Poutres_en_spaghettis_P1020885.JPG
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|Main_Picture=Shield_PetitBot_IMG_20191205_104057.jpg
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|Licences=Attribution (CC-BY)
 
|Licences=Attribution (CC-BY)
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|Description=Il s'agit de réaliser des poutres en treillis de spaghettis afin d'en expérimenter la résistance mécanique en les chargeant par un panier de billes.
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|Description=Manuel de construction du shield PetitBot V1
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La poutre est encastrée à une extrémité et chargée à l'autre par un panier de billes.
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|Disciplines scientifiques=Arduino, Computing
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|Disciplines scientifiques=Mechanics, Physics
 
 
|Difficulty=Easy
 
|Difficulty=Easy
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|Duration=1
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|Duration=30
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|Duration-type=hour(s)
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|Duration-type=minute(s)
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|Tags=kits4kids, petitbot, soudure
 
}}
 
}}
 
{{Introduction
 
{{Introduction
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|Introduction=Cette activité de construction a été expérimentée par un groupe de collégiens qui s'étaient vraiment pris au jeu de fabriquer la poutre la plus résistante.
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|Introduction=Il n'est pas toujours aisé de réaliser un petitbot, ! Grâce à ce kit les aspects techniques et bugs en tous genre seront un mauvais souvenir
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}}
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Voici le livret succinct de l'activité: https://www.wikidebrouillard.org/images/5/53/Poutres_spaghettis.pdf
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{{Materials
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|ItemList={{ItemList
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|Item=Étain
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En tout cas, après ces expérimentations, ils ont compris pourquoi les flèches des grues sont toujours orientées de la même façon....
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}}{{ItemList
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|Item=Fer à souder
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}}{{ItemList
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|Item=Diode electro luminescente
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}}{{ItemList
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|Item=Câble de Connexion
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}}
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}}
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{{Tuto Step
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|Step_Title=Déballez le Wemos et soudez le connecteur
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|Step_Content=Les Wemos sont généralement livrés avec des connecteurs supplémentaires, nous allons souder les plus longs sur le shield PetitBot
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|Step_Picture_00=Shield_PetitBot_IMG_20191205_095553.jpg
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|Step_Picture_01=Shield_PetitBot_IMG_20191205_100139.jpg
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|Step_Picture_02=Shield_PetitBot_IMG_20191205_100610.jpg
 
}}
 
}}
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{{Materials}}
 
 
{{Tuto Step
 
{{Tuto Step
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|Step_Title=Revue du matériel
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|Step_Title=Découpez les connecteurs
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|Step_Content=La photo 1 présente le banc de test pour tester la tenue de la poutre à la charge.
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|Step_Content=Munissez vous des connecteurs et sectionnez-les pour obtenir des connecteurs de 3 broches
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|Step_Picture_00=Shield_PetitBot_IMG_20191205_100257.jpg
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|Step_Picture_00_annotation={"version":"2.4.6","objects":[{"type":"image","version":"2.4.6","originX":"left","originY":"top","left":-85,"top":-367,"width":3036,"height":4048,"fill":"rgb(0,0,0)","stroke":null,"strokeWidth":0,"strokeDashArray":null,"strokeLineCap":"butt","strokeDashOffset":0,"strokeLineJoin":"miter","strokeMiterLimit":4,"scaleX":0.24,"scaleY":0.24,"angle":0,"flipX":false,"flipY":false,"opacity":1,"shadow":null,"visible":true,"clipTo":null,"backgroundColor":"","fillRule":"nonzero","paintFirst":"fill","globalCompositeOperation":"source-over","transformMatrix":null,"skewX":0,"skewY":0,"crossOrigin":"","cropX":0,"cropY":0,"src":"https://www.wikidebrouillard.org/images/1/1b/Shield_PetitBot_IMG_20191205_100257.jpg","filters":[]}],"height":450,"width":600}
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La photo 2 montre le panier de billes tel qu'il a été chargé juste au moment de la rupture. Il suffit de peser le panier pour connaître précisément la charge qui a provoqué la rupture. C'est un critère objectif qui permet de départager les différents participants au concours.
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|Step_Picture_01=Shield_PetitBot_IMG_20191205_104057.jpg
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|Step_Picture_01_annotation={"version":"2.4.6","objects":[{"type":"image","version":"2.4.6","originX":"left","originY":"top","left":-34,"top":-294,"width":3036,"height":4048,"fill":"rgb(0,0,0)","stroke":null,"strokeWidth":0,"strokeDashArray":null,"strokeLineCap":"butt","strokeDashOffset":0,"strokeLineJoin":"miter","strokeMiterLimit":4,"scaleX":0.24,"scaleY":0.24,"angle":0,"flipX":false,"flipY":false,"opacity":1,"shadow":null,"visible":true,"clipTo":null,"backgroundColor":"","fillRule":"nonzero","paintFirst":"fill","globalCompositeOperation":"source-over","transformMatrix":null,"skewX":0,"skewY":0,"crossOrigin":"","cropX":0,"cropY":0,"src":"https://www.wikidebrouillard.org/images/3/32/Shield_PetitBot_IMG_20191205_104057.jpg","filters":[]}],"height":450,"width":600}
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La photo 3 montre le matériel nécessaire pour réaliser une poutre:
 
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- les deux plaques aux extémités
 
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- un certain nombre de spaghettis (n°3 de Panzani, par exemple)
 
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- un pistocolle
 
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La photo 4 montre le début de la construction de la poutre. Un quadrillage tracé sur les deux plaques d'extrémité peut aider pour obtenir une construction régulière et contrôlée.
 
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De même la photo 5 suggère de tracer des repères sur les spaghettis afin de réaliser des cellules de taille contrôlée.
 
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<br />
 
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|Step_Picture_00=Poutres_en_spaghettis_P1010540_.JPG
 
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|Step_Picture_01=Poutres_en_spaghettis_P1010549_.JPG
 
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|Step_Picture_02=Poutres_en_spaghettis_P1010548_.JPG
 
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|Step_Picture_03=Poutres_en_spaghettis_P1010553_.JPG
 
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|Step_Picture_04=Poutres_en_spaghettis_P1010555_.JPG
 
 
}}
 
}}
 
{{Tuto Step
 
{{Tuto Step
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|Step_Title=Construction de la poutre
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|Step_Title=Soudez les leds dans le bon sens !
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|Step_Content=La construction de la poutre demande beaucoup de délicatesse, surtout au début, lors de la fixation des premiers spaghettis.... car un spaghetti solitaire est très fragile ! On peut d'ailleurs s'aider de petits outils de maintien que chacun se développera si besoin...
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|Step_Content=Rapellez vous ! Les leds sont polarisées ! elles ont donc un sens !
  
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Ce n'est que lorsque l'on a commencé à poser les croisillons de cellules que commence à ressentir dans sa main la raideur de la construction. C'est une sensation très rassurante !
 
  
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LA Plus grande patte est le PLUS + et la MOINS grande patte est le MOINS -
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Sur la photo 1, on est encore à un stade fragile. Les 4 cellules n'ont pas encore de croisillon.... Sur la photo 2, la présence des croisillons a apporté une sensation de raideur et de solidité.
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|Step_Picture_00=Shield_PetitBot_IMG_20191205_102846.jpg
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|Step_Picture_01=Shield_PetitBot_IMG_20191205_103121.jpg
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Profitons également de voir sur ces photos que
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|Step_Picture_02=Shield_PetitBot_IMG_20191205_103137.jpg
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- les points de colle entre spaghettis sont petits
 
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- les points de colle pour l'accroche sur les deux plaques de bois sont plus gros
 
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Si on organise un concours, il faut fixer des règles équitables:
 
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- fixer la taille de la section de la poutre
 
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- donner le même nombre de spaghettis à tous
 
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- interdire de renforcer les spaghettis avec de la colle
 
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|Step_Picture_00=Poutres_en_spaghettis_P1020870.JPG
 
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|Step_Picture_01=Poutres_en_spaghettis_P1020871.JPG
 
 
}}
 
}}
 
{{Tuto Step
 
{{Tuto Step
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|Step_Title=Le spaghetti en traction et en compression
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|Step_Title=Ajoutez les cables d'alimentation
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|Step_Content=Pour nos activités, on considère qu'un spaghetti peut recevoir des efforts de traction et de compression (photo 1).
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|Step_Content=Une petite erreur s'est glissée dans la premiere version de ce shield ! il faut ajouter 2 cables d'alimentation pour que le shield fonctionne !
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|Step_Picture_00=Shield_PetitBot_IMG_20191205_104731.jpg
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La traction, c'est quand on tire dessus. Un spaghetti résiste bien aux efforts de traction. Il est facile d'expérimenter avec une bouteille d'eau que l'on remplit jusqu'à ce que le spaghetti casse en traction . Il suffit de peser ensuite la charge qui a provoqué le rupture. Notez l'utilisation de deux bouchons qui évitent de casser le spaghetti par cisaillement, bien avant qu'il ne soit cassé par la traction  (photo 2).
 
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La compression, c'est quand on applique deux forces aux extrémités, dans l'alignement du spaghetti. Le spaghetti résiste très mal à la compression. On voit très vite apparaître le flambage, puis la rupture. Il est facile de réaliser un banc de test en compression avec une petite balance de cuisine précise au gramme (photo 3). On en tire facilement la loi de rupture en fonction de la longueur.... Très utile pour optimiser la taille des cellules....
 
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Bien que les spaghettis ne soient pas des éléments de construction mécanique, leurs propriétés mécaniques sont assez homogènes....
 
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|Step_Picture_00=Poutres_en_spaghettis_TractionCompression.jpg
 
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|Step_Picture_01=Poutres_en_spaghettis_TestTraction.jpg
 
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|Step_Picture_02=Poutres_en_spaghettis_IMG_20191205_103735.jpg
 
 
}}
 
}}
 
{{Tuto Step
 
{{Tuto Step
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|Step_Title=Que faut-il faire pour gagner ?
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|Step_Title=Connectez les servos moteurs
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|Step_Content='''Expérimenter, Observer, Raisonner'''
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|Step_Content=Et roulez jeunesse !
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|Step_Picture_00=Shield_PetitBot_IMG_20191205_113944.jpg
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Sur la photo prise juste avant la rupture de la poutre, on voit bien les spaghettis qui travaillent en traction et ceux qui travaillent en compression...
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−
 
+
|Step_Picture_01=Shield_PetitBot_IMG_20191205_113950.jpg
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+
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Les paramètres qui influencent la rupture:
 
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- la section de la poutre.  
 
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Jouer sur la longueur des cellules
 
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|Step_Picture_00=Poutres_en_spaghettis_P1020887.JPG
 
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|Step_Picture_01=Poutres_en_spaghettis_P1020877.JPG
 
 
}}
 
}}
 
{{Notes}}
 
{{Notes}}
 
{{Tuto Status
 
{{Tuto Status
−
|Complete=Draft
+
|Complete=Published
 
}}
 
}}

Version du 5 décembre 2019 à 12:46

Manuel de construction du shield PetitBot V1

Auteur avatarjul | Dernière modification 20/01/2022 par Julienrat

Difficulté
Facile
Durée
30 minute(s)
Disciplines scientifiques
Arduino, Informatique
Manuel de construction du shield PetitBot V1
Difficulté
Facile
Durée
30 minute(s)
Disciplines scientifiques
Arduino, Informatique
<languages />
Licence : Attribution (CC-BY)

Introduction

Il n'est pas toujours aisé de réaliser un petitbot, ! Grâce à ce kit les aspects techniques et bugs en tous genre seront un mauvais souvenir
Étain
Item- tain IMG 20191205 104152.jpg
fil d'étain ou bobine d'étain
Fer à souder
Item-Fer à souder ferasouder.jpg
Un fer à souder, ou plus précisément un fer à braser, est un outil chauffant permettant de réaliser une opération de brasage. L'usage courant du fer à souder se fait dans le domaine du montage de composants électroniques.
Diode electro luminescente
Item-Diode electro luminescente 180px-DEL.png
Une diode électroluminescente (abrégé en LED, de l'anglais : light-emitting diode, ou DEL en français), est un dispositif capable d’émettre de la lumière lorsqu’il est parcouru par un courant électrique.
Câble de Connexion
Item-Câble de Connexion compressed cable connexion.jpg
Les câbles de connexion servent à créer rapidement des liaisons électriques sur des platines de prototypage sans avoir besoin de faire des soudures.

Étape 1 - Déballez le Wemos et soudez le connecteur

Les Wemos sont généralement livrés avec des connecteurs supplémentaires, nous allons souder les plus longs sur le shield PetitBot

Shield PetitBot IMG 20191205 100610.jpg


Étape 2 - Découpez les connecteurs

Munissez vous des connecteurs et sectionnez-les pour obtenir des connecteurs de 3 broches



Étape 3 - Soudez les leds dans le bon sens !

Rapellez vous ! Les leds sont polarisées ! elles ont donc un sens !


LA Plus grande patte est le PLUS + et la MOINS grande patte est le MOINS -

Shield PetitBot IMG 20191205 102846.jpg


Étape 4 - Ajoutez les cables d'alimentation

Une petite erreur s'est glissée dans la premiere version de ce shield ! il faut ajouter 2 cables d'alimentation pour que le shield fonctionne !




Étape 5 - Connectez les servos moteurs

Et roulez jeunesse !




Dernière modification 20/01/2022 par user:Julienrat.

Commentaires

Published

Récupérée de « https://www.wikidebrouillard.org/w/index.php?title=Poutres_en_spaghettis&oldid=4146 »
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