It’s hard to beat the ease-of-use and small size of the Arduino Nano for simple tasks, despite the availability of newer and more advanced boards. I’ve used the Nano a wide range of scenarios, but, as with the Uno and many other similar boards, all too often you’re left needing “just one more” ground or power pin to avoid a jumble of wires.
To take care of this once and for all(?), along with a few other features on my wish list, I designed the “grounduino.” This breakout board features five additional ground pins, along with five +5V pins, and four +3.3V pins. Optionally, there’s space for a capacitor, which would be especially useful when dealing with programmable LEDs–per Adafruit’s NeoPixel Überguide.
Additionally, the board is designed to accommodate screw terminals for the extra and standard Nano connections. Notably, without a bit of “creative” component bending you’ll have to choose between 3.3V screw terminals and a capacitor, though in a pinch you could certainly attach the cap’ elsewhere.
Mounting options include using either a 3mm screw/standoff, or the holes can accommodate 6-32 screws as well. It’s also possible to use it with a DIN rail adapter, which would be a convenient “snap-on” option in some situations.
source https://blog.tindie.com/2021/02/arduino-nano-extra-ground-pins-grounduino/
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