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Member Since: April 9, 2011

Country: United States

  • The 6 holes on the board that are supposed to be for the ATmega SPI have actualy 3 digital IO ports. These are the MOSI MISO and SCK that we can see on the Schematic. They correspond to arduino's 11 12 and 13 ports. (Also on the SCK (13) there is connected the green LED of the board). So, for as long as we do not use the SPI (i think nobody uses it) we can use these ports as we like ;)
    Hope i helped :)

  • i just started playing with my 9dof, and i found out that in the 6 holes we have 3 digital IO ports! These holes are supposed to be for the ATmega SPI, but actually the SPI on an ATmega connects on portB, this means that when we don't use the SPI we can use these pins for IO!
    These are pins PB3 PB4 and PB5 that on an arduino correspond to pins 11 12 and 13. As we can see on the schematic of the 9DOF they are the MISO (PB4 or 12 on the arduino), MOSI (PB3 or 11) and SCK (PB5 or 13) ports. Also on the SCK port there is connected the green LED of the board.
    I hope this will be useful to you guyz :)

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