Bonjour,
J'utilise un écran LCD brancher sur l'arduino avec les pins suivant :
RS : 7
E : 6
D4 : 5
D5 : 4
D6 : 3
D7 : 2
Et mon lecteur de carte SD aux emplacement des pins SPI (j'ai vérifié le cablâge une dizaine de fois).
Mais voilà, dès que j'initialise la library SDFAT ou la library SD, mon écran fait n'importe quoi, n'affiche pas correctement, il manque la moitié des caractères...
Si quelqu'un a une petite idée sur le problème merci de la partager 
Merci.
Mets ton LCD sur d'autre pin
Normalement dans les bibliothèques il y a les pins utilisées.
As tu ouvert les fichiers de tes deux bibliothèque (SD et Liquid crystal) pour voir si des pins n'étaient pas utilisées par les deux bibliothèques ?
Dans le monde la jungle arduino il n'y a pas de chef d'orchestre. Il n'est pas rare que deux bibliothèques se marchent sur les pieds.
Jean-François:
Mets ton LCD sur d'autre pin
Pourquoi ? Je veux dire il n'y a aucun conflit vu que la library sd utilise que les pins SPI.
et les autres connections du LCD, elles sont sur quoi ?
dfgh:
et les autres connections du LCD, elles sont sur quoi ?
Bahh RW sur le gnd.
Les autres j'utilise que le mode 4 bits.
prg exemple pour SD modifié pour avoir affichage aussi sur LCD
ca fonctionne bien chez moi
/*
SD card test
This example shows how use the utility libraries on which the'
SD library is based in order to get info about your SD card.
Very useful for testing a card when you're not sure whether its working or not.
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS - depends on your SD card shield or module.
Pin 4 used here for consistency with other Arduino examples
created 28 Mar 2011
by Limor Fried
modified 9 Apr 2012
by Tom Igoe
*/
// include the SD library:
#include <SPI.h>
#include <SD.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = 4;
void setup()
{ lcd.begin(16, 2); // initialise le LCD
Serial.begin(57600);
// Open serial communications and wait for port to open:
// Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("\nInitializing SD card...");
// we'll use the initialization code from the utility libraries
// since we're just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("* is a card inserted?");
Serial.println("* is your wiring correct?");
Serial.println("* did you change the chipSelect pin to match your shield or module?");
return;
} else {
Serial.println("Wiring is correct and a card is present.");
}
// print the type of card
Serial.print("\nCard type: ");
switch (card.type()) {
case SD_CARD_TYPE_SD1:
Serial.println("SD1");
lcd.print("SD1");
break;
case SD_CARD_TYPE_SD2:
Serial.println("SD2");
lcd.print("SD2");
break;
case SD_CARD_TYPE_SDHC:
Serial.println("SDHC");
lcd.print("SDHC");
break;
default:
Serial.println("Unknown");
lcd.print("Unknown");
}
// Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
if (!volume.init(card)) {
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
return;
}
// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print("\nVolume type is FAT");
Serial.println(volume.fatType(), DEC);
Serial.println();
volumesize = volume.blocksPerCluster(); // clusters are collections of blocks
volumesize *= volume.clusterCount(); // we'll have a lot of clusters
volumesize *= 512; // SD card blocks are always 512 bytes
Serial.print("Volume size (bytes): ");
Serial.println(volumesize);
Serial.print("Volume size (Kbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.print("Volume size (Mbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
lcd.setCursor(0,1);lcd.print(volumesize);lcd.print(" MOctets ");
Serial.println("\nFiles found on the card (name, date and size in bytes): ");
root.openRoot(volume);
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE);
}
void loop(void) {
}
dfgh:
prg exemple pour SD modifié pour avoir affichage aussi sur LCD
ca fonctionne bien chez moi/*
SD card test
This example shows how use the utility libraries on which the'
SD library is based in order to get info about your SD card.
Very useful for testing a card when you're not sure whether its working or not.
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS - depends on your SD card shield or module.
Pin 4 used here for consistency with other Arduino examples
created 28 Mar 2011
by Limor Fried
modified 9 Apr 2012
by Tom Igoe
*/
// include the SD library:
#include <SPI.h>
#include <SD.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = 4;
void setup()
{ lcd.begin(16, 2); // initialise le LCD
Serial.begin(57600);
// Open serial communications and wait for port to open:
// Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("\nInitializing SD card...");
// we'll use the initialization code from the utility libraries
// since we're just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("* is a card inserted?");
Serial.println("* is your wiring correct?");
Serial.println("* did you change the chipSelect pin to match your shield or module?");
return;
} else {
Serial.println("Wiring is correct and a card is present.");
}
// print the type of card
Serial.print("\nCard type: ");
switch (card.type()) {
case SD_CARD_TYPE_SD1:
Serial.println("SD1");
lcd.print("SD1");
break;
case SD_CARD_TYPE_SD2:
Serial.println("SD2");
lcd.print("SD2");
break;
case SD_CARD_TYPE_SDHC:
Serial.println("SDHC");
lcd.print("SDHC");
break;
default:
Serial.println("Unknown");
lcd.print("Unknown");
}
// Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
if (!volume.init(card)) {
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
return;
}
// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print("\nVolume type is FAT");
Serial.println(volume.fatType(), DEC);
Serial.println();
volumesize = volume.blocksPerCluster(); // clusters are collections of blocks
volumesize *= volume.clusterCount(); // we'll have a lot of clusters
volumesize *= 512; // SD card blocks are always 512 bytes
Serial.print("Volume size (bytes): ");
Serial.println(volumesize);
Serial.print("Volume size (Kbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.print("Volume size (Mbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
lcd.setCursor(0,1);lcd.print(volumesize);lcd.print(" MOctets ");
Serial.println("\nFiles found on the card (name, date and size in bytes): ");
root.openRoot(volume);
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE);
}
void loop(void) {
}
Bonjour, j'ai branché les pins selon l'exemple.
Toujours rien 
Toujours rien
Alors il faut élargir le champ de recherche et ne partir sur aucun à priori.
j'ai vérifié le cablâge une dizaine de fois
Recommence un câblage complet à partir de Zéro.
Il y a peut être un petit détail que tu n'arrive pas à voir . Pour te rassurer tu ne serais pas le premier à qui cela arrive.
Tu as préparé ton écran de cette façon ?
http://www.mon-club-elec.fr/pmwiki_mon_club_elec/pmwiki.php?n=MAIN.TechniquePreparationLCD
