I'm looking to build a button box / flight sim controller. I'll need 5x LED outputs, 5 x Rotary encoders and 5x buttons.
This may increase down the track as well.
With my Arduino mega, I've got 1 GND, how do I attach anything from my second item?
Do I daisy chain them or some other method?
Just connect all the pins that need to go to ground to ground.
No! Get one GND point and connect all GNDs to it.
Use a solderless breadboard or solder wire to a proto board.
As @Railroader says, use a star ground. Daisy chaining can result in grounds that are at different potentials. A bad thing.
This page may be of interest >> Common ground and why you need one
There are other grounds on the Mega. There is one next to pin 13 and there is one on the ICSP header and one one the header for programming the USB to serial chip. There are aslo a couple on the 2 row header with the higher numbered pins. Consult a Mega pinout diagram or schematic. >>
I use terminal shields and build a Power Distribution Board. The terminal shield is about $25usd thru Walmart. I build the PDB's for about $15 in parts plus less than an hour of fab. Requires soldering.
PDB instructions:
@Railroader - what do you mean get one DND and conect all GND's to it?
Do you mean run a wire from that and solder all othre GND's to this ??
Make one point, near the power supply, be "the GND". Then wire the gnd of every device to that point.
Soldered connections break. I tried buss bars. Not only was soldering a pain, but the wires continually break.
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