. ARDUINO It is a microcontroller which can control both analog and digital signal according the program uploaded in it. The boards are equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards or breadboards.Basically you could send your desired signal to the desired location.We can connect several input devices like sensors,touchpad,keypad etc. with other input devices like display,speaker,motors,led etc. Several types of arduino are available in the market like:- (i)Arduino UNO R3 (ii)Arduino lilypad (iii)Arduino Mega (iv)Arduino Robot (v)Arduino UNO R2 etc. Discussing about Arduino UNO R3 , It is a microconroller .It has 14 digital pins(0-13) followed by a GND(ground) and 6 analog pins(A0-A5) followed by two GND and one 5V and one 3.3V and Vin. The...