Added verbose serial output and named pins.

pdu_power_sequence.ino

@@ -1,24 +1,38 @@
 #include <avr/interrupt.h>
 #include <avr/sleep.h>
 
+// Define relais pins 
+#define relaisPin_1 12
+#define relaisPin_2 13
+
 void setup() {
-  // Define relais pins 
-  pinMode(19, OUTPUT);
-  pinMode(20, OUTPUT);      
+  Serial.begin(9600);  // open the serial port at 9600 bps
+
+  pinMode(relaisPin_1, OUTPUT);
+  pinMode(relaisPin_2, OUTPUT);
+
+  Serial.println("Hello!");
 }
 
 void loop() {
-  delay(2000);             // Wait for 2 seconds
-  digitalWrite(19, HIGH);  // Poweron Relais #1
+  delay(2000);  // Wait for 2 seconds
+  Serial.println("Enable power rail #1");
+  digitalWrite(relaisPin_1, HIGH);  // Poweron relais #1
+
   delay(2000);
-  digitalWrite(20, HIGH);  // Poweron Relais #2
+  Serial.println("Enable power rail #2");
+  digitalWrite(relaisPin_2, HIGH);  // Poweron relais #2
+
+  delay(50);  // wait for UART to finish
   stop();         
 }   
 
 void stop() {
-  // Send microcontroller to sleep
+  // Turn microcontroller off
+  Serial.println("All done, powering off. Goodbye.");
+  delay(100);  // wait for UART to finish
+
   set_sleep_mode(SLEEP_MODE_PWR_DOWN);
   cli();
   sleep_mode();
 }
-