Schematic view of an Arduino connected to a voltage divider input circuit on analog in pin 0 and a servomotor on digital pin 3. On the left, a fixed 10-kilohm resistor is attached to analog in pin 0 and to ground on the Arduino. A variable resistor is attached to analog in pin 0 and to +5 volts. On the right, a servomotor’s control wire is attached to digital pin D3. The motor’s voltage input is attached to +5 volts, and its ground is attached to ground on the Arduino.