The ULN2803 is useful for providing power to loads that cannot be handled directly by microcontrollers. Pins 1-8 are designed to receive low level signals. Pins 11-18 are the outputs. Put it simpy, It works exactly similar to transistor. Pin 1 drives pin 18, pin 2 drives pin 17, and so on. In this circuit, nine LEDS are interfaced with Arduino using ULN2803A IC. The digital I/O pins on the Arduino can only sink 40mA so that driving multiple LEDs is beyond its capabilities. The LEDs are powered by the 9V battery.
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