Connect Power and Ground to Power Bus Strips

Cow Pi mk1e: Arduino Nano form factor

The columns marked with red and blue stripes are the power bus strips, also known as the power rails. You will now provide power to the bus strips so that the other components can use power.

Important

Before proceeding further, disconnect the USB cable from the Arduino Nano.

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Take the male-to-male rainbow cable, and peel off two wires.

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Insert one end of a wire into contact point a12 (notice that contact point a12 is electrically connected to the Arduino Nano’s 5V pin, which is in contact point c12).

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Insert the other end of the 5V wire into the upper power (+) rail marked with a red stripe.

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Now insert one end of the other wire into contact point j12 (notice that contact point j12 is electrically connected to one of the Arduino Nano’s GND pins, which is in contact point g12).

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Insert the other end of the GND wire into the upper ground (–) rail marked with a blue stripe. See Fig. 22.

Fig. 22 Tapping power and ground from the Arduino Nano.

Note

The lower power (+) rail and the lower ground (–) rail are not connected to anything. This is because we want to keep the rat’s nest of jumper wires away from the slide-switches and pushbuttons. If you later attempt to use the lower power (+) rail and the lower ground (–) rail for power & ground, that will be ineffective.

Attention

CHECKPOINT 3 | Before proceeding further, have a TA, a classmate, or a friend verify that you have correctly connected the Arduino Nano to the upper power (+) rail and the upper ground (–) rail. Update your checkpoints.txt file to indicate who checked your work and when they did so.