Question on Arduino Pro pinout

Other Hardware General Electronics
1

I've started working with an Arduino Pro to implement a designed I've worked out using an Uno R3. On the Uno, there are two sets of outputs for i2C (SCL & SDA) - A4 and A5 and also on last two (unmarked pins) after GND and VREF - in the corner near the reset button.

I can't seem to find where any of them are on the Pro! - and searching the web gets no real pin-outs for the Pro. Many for the Pro-Mini, but none for the Pro. And Sparkfun's docs are pretty useless as well in this area.

Any hints as to where SCL & SDA signals are located on the Arduino Pro?

=Alan R

2

If this is what you have A4 and A5 are your SDA and SCL:

See schematic:

3

Thanks for the link! I had gotten an early schematic - V12 and this one has the correct info.

=Alan R.

4

Harrzack:
I've started working with an Arduino Pro to implement a designed I've worked out using an Uno R3. On the Uno, there are two sets of outputs for i2C (SCL & SDA) - A4 and A5 and also on last two (unmarked pins) after GND and VREF - in the corner near the reset button.

They're the same, they just appear in two places. A multimeter will prove it.

Harrzack:
I can't seem to find where any of them are on the Pro! - and searching the web gets no real pin-outs for the Pro. Many for the Pro-Mini, but none for the Pro. And Sparkfun's docs are pretty useless as well in this area.

Any hints as to where SCL & SDA signals are located on the Arduino Pro?

A4 and A5