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Systèmes élec. & informatiques (MESISI120424)

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

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74HC393, quelle (es)  affirmation (s) est fausse (s) ?

The 74HC/HCT393 are 4-bit binary ripple counters with separate clocks (1CP and 2 CP) and master reset (1MR and 2MR) inputs to each counter. The operation of each half of the "393" is the same as the "93" except no external

clock connections are required.

The counters are triggered by a HIGH-to-LOW transition of the clock inputs. The counter outputs are internally connected to provide clock inputs to succeeding stages.

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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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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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La tension moyenne d'un signal PWM ayant un rapport cyclique de 20% et une amplitude Vcc=10V est:

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74HC74, quelle est l'affirmation fausse ?

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Soit le circuit suivant:

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Le circuit intégrés 74 HC4051:

choisir le ou les affirmations correctes:

         

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La tension moyenne d'un signal PWM ayant un rapport cyclique de 20% et une amplitude Vcc=10V est:

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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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