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The state machine is the most commonly used design model in engineering applications. With a state machine, we can easily implement decisions and branches in a program flowchart. A LabVIEW state machine consists of a While Loop, a Case Structure, and a shift register.
The components used include a simulated power supply, a transformer, a bridge rectifier, a non-polarized capacitor, an electrolytic capacitor, and a three-terminal voltage regulator IC. The wiring method is shown in the figure.
When designing MCU circuits, the number of MCU I/O pins is limited and sometimes cannot meet our design requirements. To control more devices, we need peripheral digital chips for pin expansion. A common choice is the 74HC138, also called a three-to-eight (38) decoder.
The CD4066 is a quad bilateral analog switch. Connect the four inputs of the CD4066 to the L298N outputs and the CD4066 outputs to the stepper motor's A+, A-, B+, and B- terminals. Tie all four control pins to one MCU pin so a single pin can switch all four switches on the CD4066 together, enabling stepper motor selection.
Solution: Choose Design—Configure Power Rails. Under Power Supplies, add the power supply that is not connected to a net to the list of connected nets.
A microcontroller cannot drive a stepper motor directly, so an L298N is needed as the driver. This article introduces some L298N parameters, along with the drive principles and methods for a two-phase four-wire stepper motor. A simulation experiment is also performed in Proteus based on the drive principles described.
