There are 2 dedicated digital inputs on the Main connector, that share the same external pin with digital output channels:

• Ignition (IGN) / Digital I/O 5 (DIO5)
• Emergency (SOS) / Digital I/O 6 (DIO6)

Here below the simplified schematics (ignition is active-high, while emergency is active-low):

Here is an example Arduino sketch that reads both digital inputs and displays their status:

void setup() 

void loop() 

The same example with Zerynth:

from fortebit.polaris import polaris

polaris.init()

while True:
    print("Ignition (IGN):", "ON" if polaris.getIgnitionStatus() else "OFF")
    print("Emergency (SOS):", "ON" if polaris.getEmergencyStatus() else "OFF")
    sleep(1000)