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Clignotant à LED PIC 16F887 et ADC schéma


  • Savoir les caractéristiques du microcontrôleur PIC16F887
  • Savoir lire le convertisseur A/N (ADC)
  • Savoir comment afficher la valeur du convertisseur ADC en utilisant les LEDs


  • Instruments numériques (voltmètre, ampèremètre, wattmètre, etc.)
  • Mesure de la résistance
  • Surveillance d’un équipement électronique (surcharge, surintensité, etc.)
  • Etc.

Caractéristiques du microcontrôleur PIC16F887

  • 35 instructions
  • Horloge : DC au 20MHz
  • Mode faible consommation
  • POR : Powe on Reset
  • PWRT : Power up Timer
  • Mémoire SRAM: 368
  • Mémoire EEPROM 256
  • Entrées/sorties : 35
  • Convertisseur A/N : 14 canaux, 10 bits
  • EUSART : 1
  • MSSP : 1
  • Comparateurs : 2
  • Timers 8/16 bits : 2+1
  • Standby Current: – 50 nA @ 2.0V, typical
  • Operating Current: – 11 μA @ 32 kHz, 2.0V, typical – 220 μA @ 4 MHz, 2.0V, typical
  • Watchdog Timer Current: – 1 μA @ 2.0V, typical
  • Autres: Datasheet PIC16F887


void ADC_Init();

Fonction d’initialisation du convertisseur A/N interne du PIC afin de fonctionner ave l’horloge RC. La fonction ne retourne aucune valeur et ne prend aucun argument à l’entrée. Elle nécessite la présence d’un convertisseur A/N dans l’architecture matérielle du PIC.

unsigned ADC_Get_Sample(unsigned short channel);

La fonction prend en entrée le numéro du canal, puis elle retourne la valeur actuelle du convertisseur en format unsigned short (16 bits non signés ou deux octets). En effet, les convertisseurs A/N des PICs ont souvent une résolution sur 8,10 ou 12 bits (inférieure à 16 bits). Avant d’utiliser la fonction il faut faire appel à la fonction d’initialisation: ADC_Init() et s’assurer que le pin est bien configurer en entrée (TRISx=1 ).


unsigned adc_val;
adc_val = ADC_Get_Sample(2);    // read le canal 2 du convertisseur

unsigned ADC_Read(unsigned short channel);

Identique à la fonction précédente. En revanche. L’appel de la fonction ADC_Init n’est pas obligatoire.

Fonctionnement du Clignotant à LEDs

Le fonctionnement de l’application consiste le contrôle de l’allumage d’une série de 10 LEDs en utilisant un potentiomètre analogique. Le potentiomètre est branché avec le pin 2 du port A (PA2) configuré en entrée analogique. La valeur acquise par le convertisseur codée sur 10 bits (1024 combinaisons) sera ensuite affichée dans les LEDs. L’affichage sera effectué en deux étapes : Affichage du poids fort (MSB) de la valeur dans le port B, le deux bits restants (MSB) sera affiché dans le port C.

Nous avons utiliser une boucle  infinie while() afin de lire et afficher la valeur analogique dans les ports B et C branchés aves les 10 LEDs. Ci-dessous le programme MikroC et le schéma ISIS de câblage. L’allumage des LED est directement lié avec le pourcentage du curseur du potentiomètre RV1.

Affichage en fonction du potentiomètre

  • 25%

Clignotant à LED PIC 16F887 et ADC rapport 25

  • 50%

Clignotant à LED PIC 16F887 et ADC rapport 50

  • 100%

Clignotant à LED PIC 16F887 et ADC rapport 100

Programme MikroC

#include <built_in.h>

unsigned int adc_val;

void main() {

     // Initialisation ADC

     // Port A en entrée
     // Configuration en sortie des ports
     // Lecture et affichage de la donnée ADC
      adc_val=ADC_Read(2);   // Ou adc_val=ADC_Get_Sample(2);
      PORTB=adc_val;         // Affichage 8 bits LSB
      PORTE=adc_val>>8;      // Affichage 8 bits MSB


Retour à l’accueil MikroC

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