Communicating with the Flight Controller Board using Node-RED for Leak Sensor pin

Blue Robotics Products Flight Controllers
1

Hello, we have a flight controller and are waiting for a new Pi4B to come in so we can use it then. We want to be able to do 3 things essentially:

  • Read the ADC0 output for current sensing
  • Read the leak sensor outputs
  • Set Flight Controller digital pins

I can already use node-red-contrib-ads1x15_i2c to get the ADC output.
I also plan on using node-red-contrib-pca9685 as the PWM channels are controlled by a PCA9685 as was stated in one of the flight controller guides.

I am confused as to how to monitor the leak sensor connections. Any info on a controller I can communicate with to get the leak sensor status?