diff --git a/sam3s_example/include/board.h b/sam3s_example/include/board.h
index 6276b040..d3644d4c 100644
--- a/sam3s_example/include/board.h
+++ b/sam3s_example/include/board.h
@@ -108,6 +108,13 @@
 
 #define SIM_PWEN_PIN            {PIO_PA5, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_DEFAULT}
 
+#define PWR_PINS                                                         \
+    /* Enable power converter 4.5-6V to 3.3V; low: off */               \
+    {SIM_PWEN, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT},               \
+    /* Enable second power converter: VCC_PHONE to VCC_SIM; high: on */ \
+    {VCC_FWD, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_DEFAULT}
+
+
 #define SW_SIM      PIO_PA8
 #define SMARTCARD_CONNECT_PIN {SW_SIM, PIOA, ID_PIOA, PIO_INPUT, PIO_PULLUP | PIO_DEBOUNCE | PIO_DEGLITCH | PIO_IT_EDGE }
 //#define SMARTCARD_CONNECT_PIN {SW_SIM, PIOB, ID_PIOB, PIO_INPUT, PIO_PULLUP | PIO_DEBOUNCE | PIO_IT_EDGE}