when Arduino is connected to one device, it will often be joined by many wires
can then record your power to the device through which wire, type
digitalWrite (1, HIGH); digitalWrite (2, HIGH);
so-called parallel recording for 2 batteries 1 and 2 are recorded simultaneously
but parallel SR recorded a record transfer serial
recording their serial is just 1 pin, but in the first period very short, I constantly write data via the wires that
need SR reason: if vs 1 Arduino connected to certain devices, say to 10-pin, but not enough, use SR, SR consuming only 3 Arduino pin
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