unused analog IN ports supported by current software version?

Projects Programming
1

Hi,
I tried to find info about it, but without success. Unfortunately, the forum search uses Google, so I got 24.000 entries for my search. That's not really usefull...

My question is if I can use the 2 unused analog IN on an Uno SMD? I'm scared because it looks like the original Arduino Uno SMD board uses only 6, and 2 of them are already reserved for I2C anyways. The accessable analog pins on the proto board are just 0-5, and not 0-3 and 6 and 7, so you will loose 2 pins if you are going to connect I2C devices.

I need 6 analog IN and I need to hook up an I2C display. So what I need to know is, if I can activate analog IN 6 and 7 for inputs too to get 6 dedicated analog IN without touching the I2C capability.

Thanks a lot...

2

A6 and and A7 are analogue inputs only.
You can't use them as digital inputs or outputs.

3

Sure, these pins are not digital I/O, but that wasn't my question at all. My question is still, if they are usable as analog IN and what I need to do to use them. Because these pins are not available on the Arduino Uno SMD board. I suppose, they are also not controllable with programming. Simple question, I think, but no official answer to find in manuals or FAQ.

Accessible per Arduino software (latest stable version) YES or NO?

If YES, is there something to change on Arduino software?

4

Because these pins are not available on the Arduino Uno SMD board.

It's going to be difficult to connect anything to them, then, isn't it?

If you can't connect anything to them, do the rest of your questions matter?

5

PaulS, forget about the prototyping Arduino boards. We are talking about inputs on a Atmel micro controller and the Arduino programming software. Nothing else. I don't care how the board looks like because I only use the µC on my own boards. And it is nicier to answer a question, if you can, instead of reply with a pointless counterquestion.

Besides, the Nano with 328p has all 8 analog INs connected to it's pins. So I suppose, they are accessible. But I also read about people they weren't successful to access analog IN 6 and 7, but probably are these threads older and not related to the current Arduino bootloader and software. So I thought it saves me some time to ask.

6

The current version of software supports A6 and A7as analogue-only inputs, without affecting I2C
If you can connect to them, you can use them.

7

Thank you AWOL, that's exactly that I needed to know!!

8

if you select a board type of Nano, the pins should be addressable as A6/A7 without any mods to anything.

You can review the pins_arduino.h for a board and see that the pins are in the mapping.