Removed unused variable from examples, set default main.c to blink example.

compile

@@ -1,11 +1,11 @@
 #!/bin/bash
 
-#MMCU=atmega328p
-MMCU=atmega168
-#AVR_TYPE=ATMEGA328P
-AVR_TYPE=ATMEGA168
-#BAUD=57600 # atmega328p
-BAUD=19200 # atmega168
+MMCU=atmega328p
+#MMCU=atmega168
+AVR_TYPE=ATMEGA328P
+#AVR_TYPE=ATMEGA168
+BAUD=57600 # atmega328p
+#BAUD=19200 # atmega168
 
 echo "MMCU set to $MMCU"
 echo "AVR_TYPE set to $AVR_TYPE"
@@ -28,4 +28,3 @@ avr-objcopy -O ihex -R .eeprom build/main build/main.hex
 avrdude -F -V -c arduino -p $AVR_TYPE -P $1 -b $BAUD -U flash:w:build/main.hex
 
 rm -r build
-