Emlid Neutis has 60 GPIO pins. See the pinout section for more information.
GPIO can be accessed through Linux’s sysfs interface. (
GPIO Sysfs Numbers¶
To obtain the correct number of the desired pin you have to calculate it from the pin name:
(position of letter in alphabet - 1) * 32 + pin number
Also, you can use this formula in Python interpreter:
(ord(pin_letter) - ord("A")) * 32 + pin_number
In this example, we are controlling user LED connected to the pin PA10.
According to the formula above, the correct pin number is
(1 - 1) * 32 + 10 = 10.
Let there be light¶
1) To control a GPIO bit you should first to export the pin:
echo 10 > /sys/class/gpio/export
After that, you'll see a new directory
/sys/class/gpio containing the files you need to control the pin.
2) Write "out" to /sys/class/gpio/gpio10/direction:
echo out > /sys/class/gpio/gpio10/direction
3) Set the value:
echo 1 > /sys/class/gpio/gpio10/value
4) To turn off the LED you need to write 0:
echo 0 > /sys/class/gpio/gpio10/value
When you are done, remove GPIO pin by just unexporting it:
echo 10 > /sys/class/gpio/unexport