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Stepper Motor Control using 89C51 Microcontroller

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Here’s a stepper motor controller based on 89C51 microcontroller to control the rotation of a DC stepper motor in clockwise and anti-clockwise directions. The controller is simple and easy-to-construct, and can be used in many applications including machine control and robotics for  controlling the axial rotation in XY plane. A similar circuit can be added to control the rotation of the motor in either XZ or YZ plane.

Fig. 1 shows the block diagram of the stepper motor control system. The power supply section (in Fig. 2) consists of a step-down transformer (7.5V AC, 1A), bridge rectifier (comprising diodes D1 through D4), filter capacitors (C1 and C2) and regulator IC 7805.

We have used here an Atmel make low-power, high-performance, 8-bit CMOS microcontroller AT89C51 with 4 kB of Flash programmable and erasable read-only memory (PEROM). It has a 128×8-bit internal  RAM, 32 programmable input/output (I/O) lines and two 16-bit timer/counters. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional non-volatile memory
programmer.
Source: Kitsnspares
Author: Mandeep Singh Walia

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