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, 2015 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, 2015 at 3:17

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Please explain. Can I use A1 To A6 to drive my servos Normally ??
– Ranjan Jha
Jul 30, 2015 at 4:03
Only PWM-capable pins can drive servos normally.
– Ignacio Vazquez-Abrams
Jul 30, 2015 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, 2015 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, 2015 at 10:51

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