The board also has a 6-pin ISP header that allows it to be programmed with an external programmer, such as our USB AVR programmer {{polpl|3172}}. Pin 1 of the header is indicated with a small white dot and has an octagonal shape. | The board also has a 6-pin ISP header that allows it to be programmed with an external programmer, such as our USB AVR programmer {{polpl|3172}}. Pin 1 of the header is indicated with a small white dot and has an octagonal shape. |