Sunday, February 22, 2015

Circuit Diagram Interface Stepper Motor with 8051 Microcontroller (AT89C51)

Robotronicdiagram. - Circuit Diagram Interface Stepper Motor with 8051 Microcontroller (AT89C51) like in figure 1 below is circuit that show you how to Interface Stepper Motor with 8051 Microcontroller (AT89C51).

Figure 1. Diagram Interface Stepper Motor with 8051 Microcontroller


A Unipolar Stepper Motor is rotated by energizing the stator coils in a sequence. In unipolar stepper, the direction of current in stator coils is not required to be controlled by the driving circuit. Just applying the voltage signals across the motor coils or motor leads in a sequence is sufficient to drive the motor.

A two phase unipolar stepper motor has a total of six wires/leads of which four are end wires (connected to coils) and two are common wires. The color of common wires in the stepper motor used here is Green. Each common wire is connected to two end leads thus forming two phases. The end leads corresponding to each phase have to be identified.

Circuit Description:

In the circuit, Port P2 is defined as output port to provide the input sequence for the stepper motor. Four transistors are used as switches to drive the motor. The motor leads are not directly interfaced with the microcontroller pins because stepper motor requires 60mA current while AT89C51 has the maximum current rating of 50mA. So the transistors switches are used to transfer signals from the microcontroller to the stepper wires.

The sequence of signals mentioned in the tables above rotates the motor in clockwise direction. Reversing these input sequences would rotate the motor in counter clockwise direction. Read more from the original article "How to Interface Stepper Motor with 8051 Microcontroller (AT89C51)".

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