uberdanzik:
I'd love to try an opamp, but finding one that ran on the arduino's 5v power proved difficult. Every example I found wanted me to use a power supply that had negative voltage or ran on 9-18 volts.
I've been using the LM358 in various applications on the Arduino, such as this one:
And my radio-controlled car:
There's no problem with just connecting it to +5v and Gnd.