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GPIO Port
:
1, 2
Auxiliary
:
Receive
Description
:
This function accepts a digital input with a low state enabling the atmospheric pressure
sensor and a high state disabling the atmospheric pressure sensor.
10.6.1.7 Set Zero Orientation Alignment
Type
:
Digital Input
GPIO Port
:
1, 2
Auxiliary
:
Receive
Description :
This function accepts a digital input. The input is normally low and a transition from low to
high causes Boreas to set its alignment so that the current orientation is zero. Due to the
risk of exhausting the flash cycles, the change is not permanent and will disappear on
reset. To make it permanent the
11.5.4 Installation Alignment Packet must be read and
then sent back to Boreas with the permanent flag set. This function requires de-bouncing
if attached to a switch.
10.6.1.8 System State Packet Trigger
Type
:
Digital Input
GPIO Port
:
1, 2
Auxiliary
:
Receive
Description
:
This function accepts a digital input. The input is normally low and a transition from low to
high causes Boreas to send the System State Packet. This function requires de-bouncing
if attached to a switch.
10.6.1.9 Raw Sensors Packet Trigger
Type
:
Digital Input
GPIO Port
:
1, 2
Auxiliary
:
Receive
Description :
This function accepts a digital input. The input is normally low and a transition from low to
high causes Boreas to send the
11.4.9 Raw Sensors Packet . This function requires de-
bouncing if attached to a switch.
10.6.1.10 1PPS Input
Type
:
Digital Input
GPIO Port
:
1, 2
Auxiliary
:
Receive
Description
:
This function is designed to allow external GNSS receivers to synchronise time with
Boreas. It triggers on a transition from low to high.
v1.2 Page 99 11 Oct 2022
Boreas Reference Manual • Interfacing