Ardunio is device that allow us to control electrical appliances through our computer & smart phones .we can control any electrical appliance through ardunio .
There are many sort of ardunios Like.
1 : Ardunio UNO
2: Ardunio mega
3: Ardunio nano
![device20_1000_1.jpg] #fig source google (
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4: Ardunio leonardo
and any others etc.