I’m using a Matbotix Analog Sonar that I connected to my Pixhawk’s ADC3.3V port as described in http://ardupilot.org/copter/docs/common-rangefinder-maxbotix-analog.html
The analog Sonar signal is connected to pin 14 (as per http://ardupilot.org/copter/docs/common-pixhawk-overview.html). My problem is that I can’t select that input pin (14) to the RNGFND_PIN (Rangefinder pin) parameter in Mission Planner. The dropdown list allows: 0-9 (APM2) 11 (PX4), 15 (ADC6.6v port) or 64 (APM1).
I recall that in some previous version of Mission Planer this parameter didn’t have the dropdown list and I was able to manually input the number “14”. Is there a reason why this was restricted?