I'm sorry, I know this is a basic question, but is it possible to connect more than two ground wires form multiple devices to my Arduino? I'm not sure where to start. Thank you!
Just wire as many connections as you want to the same pin. Or take a wire from the ground pin and connect that to as many places as you want.
The official boards don't supply nearly enough ground and power pins. I put 4-5 each on all my microcontroller breakout boards.
You end up needing "splitters" of some sort - I've done things with scraps of strip-board (see tindie link - I sell some nice protoboard ;-) ) and 0.1" pin header, or you can cut up dupont jumpers and solder them back together to make a Y.
Or you can use solderless breadboard - I really don't like the stuff, you spend more time debugging loose wires than real problems - but plenty of people swear by it.
DrAzzy: The official boards don't supply nearly enough ground and power pins. I put 4-5 each on all my microcontroller breakout boards.
In fact, that is why they sell things called "sensor shields".
Grumpy_Mike: Just wire as many connections as you want to the same pin. Or take a wire from the ground pin and connect that to as many places as you want.
Love your avatar. :D So I can just fit them all in the same ground hole on my UNO?
Ian_McElrath: Love your avatar. :D So I can just fit them all in the same ground hole on my UNO?
Yes that is right.
“So I can just fit them all in the same ground hole on my UNO?”
Er, uh, that just doesn’t sound right… You can connect them all together, but you are only gonna get one pin in that ‘hole’
but you are only gonna get one pin in that 'hole'
Depends on how thin the wire is.
Or, how big your hole is?
Even if you could fit more than one wire into the ground hole, I imagine you'd have trouble getting a reliable connection. We've all recommended much more reliable ways to do this.
Remember - making reliable connections is important because it saves you time and frustration when a problem turns out to be a loose wire - and debugging stuff that turns out to be loose wires is a depressing time sink, because you're not even learning anything interesting.
123Splat: Or, how big your hole is?
she he said
Getting back to serious...... bah,,,,
Prototyping shield for uno has way more 5V & GND connections than I've ever needed. Maybe that's what pancake is talking about.
A Gnd terminal can be jumpered to your breadboard, even the kind without the long strip - just gang several rows together. Simple.
(I came up with the "Ground Shield", in my head, a while ago - nothing but headers connected to Gnd, admittedly mocking the prevalent shield-dependency. Ideally, it would be paired with the "On/Off Shield".)
Hey, I posted close enough in #3, didn't I?
I think you can use pin 6 of the ICSP pins
Get an Arduino Nano (clone), get a breadboard (yes, I know the caveats, but I don't think the OP is going to run any MHz bus system anytime soon), plug it together -> profit.
I continue to fail to understand how anybody can think that the Uno is a good form factor.
I think a post that started in August 2015 should not have been resurrected by agrp87132 yesterday.
confirmed you can use pin 6. on my uno pin diagram (wasn't easy to find or marked) ISCP 1,2 3,4 5,6