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+j'ai reussi a faire fonctionner le petit clavier et le lcd 
+les 2 ecrans fonctionnent
+pour le back light qui ne s'allume pas j'ai fait l'essai avec une frontale sur le coté
+ je vais  faire eclairer la led autrement 
+le transistor doit être mort  
+
+attention au réglage potentiometre de la polarisation 
+V0 doit être vers 1.10 volt 
+
+
+// select the pins used on the LCD panel
+LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
+ et non pas  8 9 7 6 5 4
+
+https://www.dfrobot.com/wiki/index.php/Arduino_LCD_KeyPad_Shield_(SKU:_DFR0009)
+Old libraries for V1:
+LCDKeypad
+DFR_Key
+
+http://image.dfrobot.com/image/data/DFR0009/LCDKeypad%20Shield%20V1.0%20SCH.pdf
+https://www.dfrobot.com/wiki/images/a/a7/LCDKeypad_Shield_SCH.png
+https://www.youtube.com/watch?v=D6iaUeJPMc0
+
+Example use of LiquidCrystal library
+___________
+//Sample using LiquidCrystal library
+#include <LiquidCrystal.h>
+
+/*******************************************************
+
+This program will test the LCD panel and the buttons
+Mark Bramwell, July 2010
+
+********************************************************/
+
+// select the pins used on the LCD panel
+LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
+
+// define some values used by the panel and buttons
+int lcd_key     = 0;
+int adc_key_in  = 0;
+#define btnRIGHT  0
+#define btnUP     1
+#define btnDOWN   2
+#define btnLEFT   3
+#define btnSELECT 4
+#define btnNONE   5
+
+// read the buttons
+int read_LCD_buttons()
+{
+ adc_key_in = analogRead(0);      // read the value from the sensor 
+ // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
+ // we add approx 50 to those values and check to see if we are close
+ if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
+ // For V1.1 us this threshold
+ if (adc_key_in < 50)   return btnRIGHT;  
+ if (adc_key_in < 250)  return btnUP; 
+ if (adc_key_in < 450)  return btnDOWN; 
+ if (adc_key_in < 650)  return btnLEFT; 
+ if (adc_key_in < 850)  return btnSELECT;  
+
+ // For V1.0 comment the other threshold and use the one below:
+/*
+ if (adc_key_in < 50)   return btnRIGHT;  
+ if (adc_key_in < 195)  return btnUP; 
+ if (adc_key_in < 380)  return btnDOWN; 
+ if (adc_key_in < 555)  return btnLEFT; 
+ if (adc_key_in < 790)  return btnSELECT;   
+*/
+
+
+ return btnNONE;  // when all others fail, return this...
+}
+
+void setup()
+{
+ lcd.begin(16, 2);              // start the library
+ lcd.setCursor(0,0);
+ lcd.print("Push the buttons"); // print a simple message
+}
+ 
+void loop()
+{
+ lcd.setCursor(9,1);            // move cursor to second line "1" and 9 spaces over
+ lcd.print(millis()/1000);      // display seconds elapsed since power-up
+
+
+ lcd.setCursor(0,1);            // move to the begining of the second line
+ lcd_key = read_LCD_buttons();  // read the buttons
+
+ switch (lcd_key)               // depending on which button was pushed, we perform an action
+ {
+   case btnRIGHT:
+     {
+     lcd.print("RIGHT ");
+     break;
+     }
+   case btnLEFT:
+     {
+     lcd.print("LEFT   ");
+     break;
+     }
+   case btnUP:
+     {
+     lcd.print("UP    ");
+     break;
+     }
+   case btnDOWN:
+     {
+     lcd.print("DOWN  ");
+     break;
+     }
+   case btnSELECT:
+     {
+     lcd.print("SELECT");
+     break;
+     }
+     case btnNONE:
+     {
+     lcd.print("NONE  ");
+     break;
+     }
+ }
+
+}