SparkFun will be closing early at 3:30 Friday 5/27 and remain closed Monday for Memorial Day (5/30). Orders placed after 2pm MT on Friday (5/27) will process and ship out on Tuesday (5/31).

Member #35782

Member Since: March 25, 2008

Country: United States

  • I did this with an atmega644 and it programmed fine but the LED wasn’t flashing - turns out my problem was I had the LED the wrong way around, negative to PB0 (or various other pins), positive to 5V through a resistor. Why is this? Do the pins on 644s work in a different manner .. ?

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