using 1.1v Vref on the Arduino analog to digital converter for better precision

simulator/rdtemp/rdtemp.ino

@@ -4,7 +4,7 @@
 /* -------------------------------------------------- */
 
 #define NBVAL   4
-#define DELAI   10000
+#define DELAI   12000
 
 int   values[NBVAL];
 
@@ -13,7 +13,14 @@ void setup() {
   Serial.begin(9600);
   pinMode(LED_BUILTIN, OUTPUT);
   Serial.print("\n");
-  delay(2000);
+  /* XXX */
+  /*  changing the voltage reference of the ADC
+   *  greatly increase the prcision on the limited
+   *  range of our temperatures.
+   */
+  analogReference(INTERNAL1V1); // Pour Arduino Mega2560
+  
+  delay(1000);
 }
 /* -------------------------------------------------- */
 void updatevalues(void)
@@ -21,7 +28,7 @@ void updatevalues(void)
   int foo;
   for (foo=0; foo<NBVAL; foo++) {
     values[foo] = analogRead(A0);
-    delay(500);
+    delay(200);
    }
 }
 /* -------------------------------------------------- */