Servo Trigger - Analog Voltage to Logic

I currently use the momentary switch method and its a nice board for this project. With next board I get I would like to use a Analog Voltage (0 volts off +2.3v on) as trigger. Is this board able to be programmed to do that, or would i need an external device such as a ADC? I don’t have any experience with ADC, would one need to be programmed or ready to go? One requirement is that my trigger source cannot have power fed back to it, do these have diodes built in or do I use my own? Sorry if question has been asked/answered but I read all the 7 servo trigger pages and didn’t see an answer for how to convert analog trigger to logic if needed.

Thank you,

RS