Octal peripheral driver array chip ULN2803 is used too boost up the voltage and current on 8 arduino outputs. Suitable for switching relays and other devices that require higher current.
Driver ULN2803 limit is 500 mA per channel.
I used only the non PWM arduino pins - skipped the ones that can be used for PWM since for the funcion this shield is made for (ON/OFF), it is not required.
Added the LEDs so that you can always have a vidual information in what state the output is.