Converting Arduino UNO's analog pins to digital I/O

Question

I am working on an Arduino UNO Project and running out of digital pins.

Can I convert the six analog pins to digital I/O and use them to drive servos?

Please suggest me a method

Just putting it out there that it is a Uno, not a UNO. It is not an acronym. — Nick Gammon♦, Jul 30 '15 at 21:13

Ignacio Vazquez-Abrams · Accepted Answer · 2015-07-30 03:17:53Z

4

A0 through A5 already have GPIO capability; treat them as you would any other non-PWM pin.

A6 and A7, found in similar boards that use a SMD package, do not have any GPIO capability whatsoever and can only be used for analog input.

answered Jul 30 '15 at 3:17

17.1k1 gold badge23 silver badges32 bronze badges

Please explain. Can I use A1 To A6 to drive my servos Normally ?? – Ranjan Jha Jul 30 '15 at 4:03
Only PWM-capable pins can drive servos normally. – Ignacio Vazquez-Abrams Jul 30 '15 at 4:24
The servo library uses software pwm if I'm not mistaken. So you should be able to use any pin. – Gerben Jul 30 '15 at 7:49
1

@RanjanJha: A0 to A5 can be referred to as D14 to D20. You could use digitalWrite(A0) or digitalWrite(14) and the effect would be the same. – CharlieHanson Jul 30 '15 at 10:51

add a comment |

1 Answer 1