{"id":6330,"date":"2021-04-07T17:29:17","date_gmt":"2021-04-07T15:29:17","guid":{"rendered":"https:\/\/www.ardpylab.fr\/?page_id=6330"},"modified":"2023-09-13T17:44:05","modified_gmt":"2023-09-13T15:44:05","slug":"des-sketchs-a-ajouter-a-ardpylog","status":"publish","type":"page","link":"https:\/\/www.ardpylab.fr\/?page_id=6330","title":{"rendered":"Des sketchs \u00e0 ajouter \u00e0 ArdPyLog"},"content":{"rendered":"\n


Voici de nouveaux sketchs \u00e0 ajouter \u00e0 la base de donn\u00e9es d’ArdPyLog.<\/p>\n\n\n\n


1. TP_Vitesse_Son<\/span><\/a><\/strong> (D\u00e9termination de la vitesse du son dans l\u2019air \u00e0 l’aide<\/em>
d’un capteur ultrasonique<\/em> – Cat\u00e9gorie: <\/span>Ondes ultrasonores<\/strong><\/a>)

<\/span><\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

 <\/p>\n

Dans cette activit\u00e9, nous allons d\u00e9terminer exp\u00e9rimentalement la vitesse de propagation des ondes sonores en mesurant, \u00e0 l\u2019aide d\u2019un capteur \u00e0 ultrasons, le HC-SR04, la dur\u00e9e de propagation Dt de l\u2019onde sonore entre l\u2019\u00e9metteur et le r\u00e9cepteur situ\u00e9s \u00e0 une distance d connue d\u2019un obstacle.<\/p>\n

Les mesures des dur\u00e9es de propagation Dt de l\u2019onde sonore entre l\u2019\u00e9metteur et le r\u00e9cepteur commencent apr\u00e8s un appui sur le bouton poussoir et sont arr\u00eat\u00e9es en appuyant de nouveau sur celui-ci.

<\/p>\n

Le programme<\/span><\/p>\n

Voici le code de l\u2019activit\u00e9 :<\/p>\n\n\n\n
\n

\/\/ D\u00e9claration des constantes et variables<\/p>\n

int TRIGGER_PIN = 8;
int ECHO_PIN = 9;
const int PinButton = 7;<\/p>\n

const unsigned long MEASURE_TIMEOUT = 25000UL;<\/p>\n

int ValButton = 0;
int OldValButton = 0;
int State = 0;
int OldState = 0;<\/p>\n

long DtMesure = 0;
long Dt = 0.0;
int Distance = 0;<\/p>\n


\/\/ Initialisation des entr\u00e9es et sorties<\/p>\n

void setup()
{
Serial.begin(9600);<\/p>\n

pinMode(PinButton,INPUT);
pinMode(TRIGGER_PIN, OUTPUT);
digitalWrite(TRIGGER_PIN, LOW);
pinMode(ECHO_PIN, INPUT);<\/p>\n

Serial.println(\u201dAppuyez sur le bouton poussoir pour mesurer la duree de propagation de l’onde sonore.\u201d);
Serial.println();
}<\/p>\n


\/\/ Fonction principale en boucle<\/p>\n

void loop()
{
ValButton = digitalRead(PinButton);
delay(10);<\/p>\n

if ((ValButton == HIGH)&&(OldValButton == LOW))
{
State=1-State;
}
OldValButton = ValButton;<\/p>\n

if (State==1)
{
if (OldState == 0)
{
while(Distance<3 || Distance>200)
{
int Val=0;
char tampon[10]=\u201d\u201d;
Serial.println(\u201dVeuillez entrer la distance en cm entre le capteur et l’obstacle (valeur entre 3 et 200):\u201d);
while(!Val)
{
delay(200);
Val=Serial.available();
}
for (int i=0; i < Val; i++)
{
tampon[i]=Serial.read();
delay(15);
}
Distance = atoi(tampon);
}
Serial.print(\u201dDistance entre le capteur et l’obstacle = \u201d);
Serial.print(Distance); Serial.println(\u201d cm\u201d);Serial.println(\u201d\u201d);
Serial.println(\u201dMesure de la duree de propagation de l’onde sonore en cours.\u201d);
Serial.println(\u201d\u201d);
Serial.println(\u201dd (cm) ; Dt (microS):\u201d);
OldState=1;
}

digitalWrite(TRIGGER_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIGGER_PIN, LOW);
Dt = pulseIn(ECHO_PIN, HIGH, MEASURE_TIMEOUT);<\/p>\n

if (DtMesure != Dt)
{
Serial.print(Distance); Serial.print(\u201d ; \u201d); Serial.println(Dt);
DtMesure = Dt ;
}
Serial.flush();
delay(100);
}
else
{
if (OldState == 1){
Serial.println(\u201dFin des mesures.\u201d);
Serial.println(\u201d\u201d);
Distance = 0;
OldState = 0;}
}
}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

D\u00e9roulement du programme<\/span> :<\/p>\n

\u2013 D\u00e9claration des constantes et variables :<\/p>\n

\"\"<\/p>\n

\u2013 Initialisation des entr\u00e9es et sorties :<\/p>\n

\"\"<\/p>\n

\u2013 Fonction principale en boucle :<\/p>\n

\"\"<\/p>\n


Il est donc possible d\u2019acqu\u00e9rir des couples de donn\u00e9es (Dt, d)<\/strong><\/a> afin de d\u00e9terminer la vitesse du son dans l’air par le trac\u00e9 de la caract\u00e9ristique Dt=f(d)<\/strong>:

<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n


et de mod\u00e9liser la caract\u00e9ristique Dt = f(d)<\/strong> :

<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n


On en d\u00e9duit la vitesse de propagation de l’onde ultrasonore:<\/p>\n

v = 2*d \/ Dt = 2 \/ a
v = 2 \/ 58,1 = 0,03442 cm\/microS = 344,2 m\/s<\/p>\n

\u00a0<\/p>\n\n\n

\n
\n\n
\"\"<\/a><\/figure>\n\n<\/div>\n\n
\n\n
\"\"<\/a><\/figure>\n\n<\/div>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

Voici de nouveaux sketchs \u00e0 ajouter \u00e0 la base de donn\u00e9es d’ArdPyLog. 1. TP_Vitesse_Son (D\u00e9termination de la vitesse du son dans l\u2019air \u00e0 l’aided’un capteur ultrasonique – Cat\u00e9gorie: Ondes ultrasonores)   Dans cette activit\u00e9, nous allons d\u00e9terminer exp\u00e9rimentalement la vitesse de propagation des ondes sonores en mesurant, \u00e0 l\u2019aide d\u2019un capteur \u00e0 ultrasons, le HC-SR04, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-6330","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=\/wp\/v2\/pages\/6330","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6330"}],"version-history":[{"count":21,"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=\/wp\/v2\/pages\/6330\/revisions"}],"predecessor-version":[{"id":6467,"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=\/wp\/v2\/pages\/6330\/revisions\/6467"}],"wp:attachment":[{"href":"https:\/\/www.ardpylab.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}