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Systèmes élec. & informatiques (MESISI120424)

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Soit le sketch ci dessous:

Que vaut la distance (en mm) entre l'obstacle et et le capteur ultrason de distance HSR04

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74HC74, quelle est l'affirmation fausse ?

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Soit le circuit suivant:

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Pour commander dynamiquement 6 capteurs analogiques avec une seule entrée Arduino (A0), on peut :

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Quelle est la formule pour calculer la température en degrés Celsius à partir de la tension de sortie du TMP36 ?

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The 74HC74 is dual positive edge triggered D-type flip-flop. They have individual data (nD), clock (nCP), set (nSD) and reset (nRD) inputs, and complementary nQ and nQ outputs. Data at the nD-input, that meets the set-up and hold time requirements on the LOW-to-HIGH clock transition, is stored in the flip-flop and appears at the nQ output.

Quelle affirmation est fausse?

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int outPin = 9 ;

void setup() {

pinMode(outPin, OUTPUT);

}

void loop() {

digitalWrite(outPin, HIGH);

delay(50);

digitalWrite(outPin, LOW);

delay(200);

}

Le rapport cyclique en %:

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74HC74, quelle affirmation est fausse ?

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Pour réaliser un compteur qui compte jusqu'à 3 et recommence

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Le circuit ci-dessous est alimenté avec un signal PWM (e(t) est un signal PWM) on peut récupérer la tension moyenne du signal :

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