I have an Arduino Uno with a Bluetooth mate Silver (rn-42) I am using the output pin of the bluetooth mate that confirms when the bluetooth is connected to a device(PIO 2) so that i can perform an action on both connection and disconnect of the bluetooth. My concern and question is on how to setup the Arduino input of PIO2 from the bluetooth to not fry the bluetooth mate. The RN-42 spec sheet says the pin is "available to drive an LED" and the output voltage is 3V. I am concerned a direct connection to the Arduino would be pulling too much amperage from the rn42 and thus damage the bluetooth, but if I remember my KVL, adding a resistor will drop the voltage down too much for the 3v minimum High of the digitalread(from what i could gather via google search is is 3v for Arduinos). I am thinking i will have to setup an analog input and create some sort of if statement to sort the high and low at a much lower voltage, but that is more work than just a simple digitalread input. This is my first Arduino project, so i apologize if this is too basic, but i dont want to damage anything.
Thanks,
storm