Pololu Zumo and the Uno...

Hi All, I never could understand why the Arduino's did'ent have pins underneath!! I am new to the Arduino and have a couple of Uno's. But I came from using the Picaxe, where their shield and my own 20 pin version used raised sockets with the usual long square pins, so you could plug the shield in to a board, as well as a board in to the shield. So the Uno? etc could be anywhere in the stack!! I know having long pins exposed could lead to power or data shorts and problems, but think the advantage it worth it.

It just seems to make sense, you can buy a Leonardo without headers so I might do that and add my own. I have just ordered a Pololu Zumo chassis, but if you use their shield (or any other) you can only plug the Uno in upsidedown!! It just don't seem right pluging your Uno in upsidedown!! So I will be making my own simpler shield "with HEADERS" and perhaps adapting a Uno or even a Nano on a home made shield.

At present once your Uno's on there, you can't add anything else..... to the sandwich



I'm sure I've seen some Arduino clones with the headers separate, so you can substitute your own or sodler them either side.... Or did I dream it?

Sticking-out long pins on the underside is a recipe for shorts, so I can see why that was avoided as the default configuration.

Hi Mark,
Thanks for the reply, yes as I stated you can at least get a Leonardo without headers and add your own, or I’ve seen a Nano on a standard sized adator sheld with lots of pin headers, but you can still add you own outer headers if you see what I mean!!

Sticky out pins only become a problem if they get bent and short, which don’ent happen if their pluged in to something else? As yet it’s never happend to me! so now it will.

Here’s a couple of pictures to show what I mean!!

Thanks and regards


Hi All,
This might make your toes curl!! But I have just added extended sockets and pins to my cheap Chinese copy Uno! The process was not too difficult, firstly removing the plastic shell, desoldering the pins and whipping them out. opening the holes and adding the sockets/pins and just resoldering. The extended sockets mean that nothing touches the USB or power sockets, either.

Yes I know this is not the way to do it, but it makes sence to me, to be able to plug a Uno in to a shield as well as the other way around, in fact having the Uno on top can have benifits. Yes pins can get bent and even short together, but you just need to be watchful, as you are for many aspects of the hobby.

Here’s a few pictures.