Simple and common

 2
Available
Electronics

TPIC6595N Shift-Register Display (DIP16)

Texas Instruments
ELC6595
€4.58
shift register chip of the  is used a lot by hobbyis because of its wide availability, good speed and simplicity. Just plug it on an arduino like shown in the tutorials and youi have 8 more outputs, put two and you have 16 more outputs ! (up to a lot of them actually, with only three pins !)
 2
Available
Electronics

PC817 4 PIN Opto-coupler PHOTOTRANSISTOR...

ECJTAOPC817
€0.40
PC817/EL817  4pin  DIP  General Purpose Photocoupler. This Opto-coupler consist of one piece of Ga as emitter and one piece of NPN transistor.
 2
Available
Electronics

MCT6 8 PIN Opto-coupler PHOTOTRANSISTOR...

ECJTAOMCT6
€0.46
8pin  DIP  General Purpose Photocoupler. This Opto-coupler consist of one piece of Ga as emitter and one piece of NPN transistor.
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