I just got an Arduino Mega, and I’ve been messing around with several components.
I want to try testing a rheostat into the analog input to get a reading over the range of 0 to 1023. The rheostat I have is only 25 ohms. I want to hook it up as in this example: http://arduino.cc/en/Tutorial/AnalogInput, but I’m afraid that 25ohms is too little and excessive current will burn something on the Arduino. Should I be worried about the current going into the analog input? How much is too much?