I have a shield I was considering making. I want it to have a single Analog Output from the Arduino to another device.
Requirements: Work with multiple versions of Arduino's. (aka the 5V output and 3.3 V output arduinos) The voltage to the other device must stay in the range 0-3.3V I want to use the minimum number of pins to achieve this. I would like this to be low power.
Questions: What type of circuit would you use to achieve this and why? Which AO pin would you use and why? (I would like this shield to not interfere with using at least one other shield.) What other conveniences would you put on this type of shield? Breadboard? Jumpers?
Thanks in advance.