I'm looking at this tutorial:
http://m.instructables.com/id/Arduino-HC-SR04-Ultrasonic-Rover/?ALLSTEPS
And I'm assuming what he did was solder pins onto the motor shield board? Would it be basically adding pins into the holes of the motor shield for A4 & A5 and then "connecting" the holes with pins to the already-soldered pins on the edge of the shield labeled A4 & A5 like in my drawing?
The thing you must learn is that by and large inctructables are crap. While his text says he uses A4 & A5 the photos show he used other pins.
Yes he solders pin headers in those holes.
How can you tell? It does kinda seems like he used A3 & 4 instead but the picture is so dark.
I just looked at the next to last picture and it does look like A4 & 5.
But my question is how did he connect the pins he soldered onto the shield, which are kind of on the inside of the shield, with the A pins which are on the edge of the shield?
It looks like 4 and 5 to me in photo? The tip of pin 3 is obscured by the housing of the jumper on A4 - note that there's no pin for A5 visible in front of the two connectors.
crap photography.
I don't know if those pads are connected. If you look at the motor shield schematic
pin-1 of that row of pads is SNS0
2 " " " " " " SNS1
3 " " " " " " A2
4 " " " " " " A3
5 " " " " " " A4
6 " " " " " " A5
Can you verify if that's the case ? Are there traces going to those pads labeled A0 - A5 ?
IF you were going to use ONE of those "A" lines, the OTHER wire should go to GND , NOT to the "Ax" pad next to the one you are using. If you were using TWO "Ax" pins then there should be TWO GND wires going to the GND bus.
I would avoid the Instructables that don't include schematics (which is probably most of them).
Did you look at the schematic I linked for the motor shield ? Do you understand the functions of those pins on that row of pads. (the pins I listed in my last post) ?
Do you know what IOREF is ? (not sure how this is used)
What about SNS0 , SNS1 ? (these are obvious)
Did you see the 3-pin connectors IN2 & IN3 and OUT5 & OUT6 ? (not so clear as to their purpose)
If you know where those signals you can easily confirm that they are connected to that row of solder pads.
Do you see the connection between the signals above and that row of pads ?
I saw your schematic but I don't really know how to read it. And your last post is somewhat above my understanding.
Are you telling me that the Shields schematic will tell me if those holes and pins are linked even though they don't look linked?
I just saw this...I know its terrible but its precisely what I want to avoid.
As you can see, this guy actually soldered header pins directly onto the motor shield's A0-A5 or at least thats what it looks like.
What Im suggesting is to use the holes that are right next to those A0-A5 pins, of which I can see 3 rows:
to connect a stack of header pins onto and then connect the corresponding A4 & A5 pins to Echo and Trig.
But what is still not clear to me is whether I would need to make a connection between the holes in the unlabeled row of holes and the actual A0-A5 pins on the very edge, or if those connections are somehow already made in the shield.
The reason I ask is that it seems to me they might be internally connected somehow.
Are those holes in any of the 3 rows mentioned above internally connected to anything already? Why is the top row labeled 5V and the middle row labeled GND if they are not connected to anything?
Thanks
If you have a meter you could check for continuity using the resistance mode.
Thanks raschemmel...for not giving me the answer. I did as you suggested, which I really should have thought of before, and indeed they are connected. I went ahead and tested the 5v-GND rows as well for voltage and theyre right on the money.
So thanks... 
Thanks raschemmel...for not giving me the answer.
I didn't have time. I was at work on a break and just enough time to reply.
"Give a man a fish....."
"Teach a man how to fish ......"
No, no, no!
I actually meant it!
I really do thank you. Those are the good answers.
I'm not being sarcastic.
I know you weren't being sarcastic. That's why I said :
"Give a man a fish ..."
The rest of the quote is:
" and you feed him for a day..."
"The rest of the quote is:
"Teach a man to fish.., and you feed him for life..."
Oh OK, just making sure.
Yeah I live that quote!
Or:-
Give a man a gun and he can rob a bank.
Give a man a bank and he can rob the whole world.
