diff --git a/led.c b/led.c
index cae1637..06e7d1b 100644
--- a/led.c
+++ b/led.c
@@ -1,22 +1,24 @@
 
 #include <parapin.h>
 
-#define LED_A 2
-#define LED_B 3
-#define LED_C 4
-#define LED_D 5
-#define LED_E 6
-#define LED_F 7
-#define LED_G 8
-#define LED_DP 9
+#define LED_A LP_PIN02
+#define LED_B LP_PIN03
+#define LED_C LP_PIN04
+#define LED_D LP_PIN05
+#define LED_E LP_PIN06
+#define LED_F LP_PIN07
+#define LED_G LP_PIN08
+#define LED_DP LP_PIN09
 
-#define LED_1 17
-#define LED_2 16
-#define LED_3 14
+#define LED_1 LP_PIN17
+#define LED_2 LP_PIN16
+#define LED_3 LP_PIN14
+
+#define LED_POSITION_MASK (LED_1 | LED_2 | LED_3)
 
 #define LED_ALL (LED_A | LED_B | LED_C | LED_D | LED_E | LED_F | LED_G | LED_DP | LED_1 | LED_2 | LED_3)
 
-int digit2leds[] = {
+int digit2pins[] = {
     LED_B | LED_C,
     LED_A | LED_B | LED_G | LED_E | LED_D,
     LED_A | LED_B | LED_G | LED_C | LED_D,
@@ -28,6 +30,14 @@ int digit2leds[] = {
     LED_A | LED_B | LED_C | LED_D | LED_F | LED_G
 };
 
+int position2pins[] = {
+    LED_1,
+    LED_2,
+    LED_3
+};
+
+void turnOnDigit(int digitPosition, int value);
+
 int main
 {
     /* initialize the parapin user-land library */
@@ -36,3 +46,14 @@ int main
     /* set up pins as output pins */
     pin_output_mode(LED_ALL);
 }
+
+void turnOnDigit(int digitPosition, int value)
+{
+    /* turn all pins off */
+    clear_pin(LED_ALL);
+
+    /* enable the positional pin */
+    register int pinSet = LED_POSITION_MASK & ~position2pins[digitPosition];
+    pinSet |= digit2pins[value];
+    set_pin(pinSet);
+}