Electrical Assembly

The pipettor subsystem uses a motor to move the pipettor subsystem, and a slide potentiometer to sense the position of the pipettor subsystem.

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Potentiometer Connections

The potentiometer has two groups of pins. One group has a single pin at one end of the potentiometer, and the other group has a pair of pins at the opposite end of the potentiometer. The pin the single-pin group should be connected to a red wire. For the other group, the pin at the end of the potentiometer should be connected to a white wire, while the remaining pin is between the other two pins and should be connected to a black wire.

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The white wire should be connected to Analog In pin A1 on the motor shield. The red wire should be connected to Power pin 5V on the motor shield. The black wire should be connected to Power pin GND on the motor shield.

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Motor Connections

When the output shaft of the motor is facing towards you and the pins of the motor are on top, the right wire should be red and the left wire should be blue or gray.

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The red wire should be connected to the terminal on M2 which is closer to the GND terminal. The blue wire should be connected to the terminal on M2 which is farther from the GND terminal. Thus, the red wire will be closer than the blue wire to the USB port on the Arduino board.

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