i have a arduino uno board (added to attachments) uno has 3 gnd ports and i wanna use 4th because i'd to use sim808 module. how can i use the breadboard for this?
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Connect one of the Uno GND pins to the blue bus bar along the edge of the breadboard then connect anything that requires a GND connection to the same bus bar
You could also use the GND pin of the ICSP connector on the Uno as an extra GND connection if required
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