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Topic: How do I connect more than 2 ground wires to my UNO? (Read 6994 times) previous topic - next topic

Ian_McElrath

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!

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.

DrAzzy

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.
ATtiny core for 841+1634+828 and x313/x4/x5/x61/x7/x8 series Board Manager:
http://drazzy.com/package_drazzy.com_index.json
ATtiny breakouts (some assembled), mosfets and awesome prototyping board in my store http://tindie.com/stores/DrAzzy

Paul__B

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".

Ian_McElrath

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? 


Grumpy_Mike

Love your avatar. :D  So I can just fit them all in the same ground hole on my UNO? 


Yes that is right.

123Splat

"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'

Grumpy_Mike

Quote
but you are only gonna get one pin in that 'hole'
Depends on how thin the wire is.

123Splat


DrAzzy

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.

Or, how big your hole is?
that's what she he said
ATtiny core for 841+1634+828 and x313/x4/x5/x61/x7/x8 series Board Manager:
http://drazzy.com/package_drazzy.com_index.json
ATtiny breakouts (some assembled), mosfets and awesome prototyping board in my store http://tindie.com/stores/DrAzzy

runaway_pancake

"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

123Splat

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.

runaway_pancake

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".)
"Who is like unto the beast? who is able to make war with him?"
When all else fails, check your wiring!

Paul__B


agrp87132


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