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8051 Microcontroller Applications Download Doctor EbookDownload doctor Ebook here....Browse by Type Available eBooks.So, nowa days the microcontrollers are discovered in every walk of lifestyle.
![]() In the laboratory you can use amicrocontroller to measure precisely the voltage, current and resistances also. 8051 Microcontroller Applications Pc Applications ProtectionCar Aeronautics Space Rail Transport Mobile communications Industrial digesting Remote sensing, Stereo and Networking Robotics Customer electronics, music players, Pc applications Protection (e-commerce, wise cards) Medical electronics (hospital apparatus, and mobile supervising) and Defense software 1. It generates torque by making use of bothelectric and permanent magnet fields. The DC engine has disc, stator, field magnet, brushes, shaft,commutator etc. The DC motor demands large currents, of the order of 400mA for its rotation.But this very much quantity of present can not be created by the ports of the microcontroller. So, ifyou straight link the DC engine to the slots of the controIler,it may draw high present for itsoperation from the ports and therefore the microcontroller may be damaged. Thus we make use of adriving signal together with an ópto isolator.The ópto-isolator provides an extra protectionto the microcontroIler from large currénts. The interface circuit consists of M293D IC which is a double H-bridge engine driver. This is certainly a 16-flag chip,which can become utilized to interface two DC engines andcan become managed in both cIockwise and anticlockwise direction of movement.T293 G provides an outputcurrent óf 600mA and peak output present of 1.2A per route. Also for defense of the circuitfrom back again emf,output diodes are usually also incorporated in the IC. Signal info, like a DC level, can be transmittedby the gadget while maintaining a high level of electrical solitude between insight and result. The slot1 pins P1.0,P1.1 G1.2 areconnected to the opto-isolator advices and the outputs of the opto-isolator are usually connected to theIN1,lN2 and the EnabIe1 pins of thé M293D driver IC. When enable is usually High and Durante2 is certainly lowand EN1 will be high,the electric motor rotates in clockwise direction.Similarly if Durante2 can be high and EN1 islow with EN pin high,the DC electric motor rotates in anticlockwise direction.To turn the motor theEN flag must end up being always higher. Enable (Durante) Input1 Input2 Result High High Low Clockwise Rotation High Low High Anticlockwise Low Either Great or Lower Either Large or Lower Great ImpedanceThe turn of the motor is managed by writing a suitable program.Set up Language system:ORG 0000H RemarksMAIN SETB P1.2 Enable the H-bridge driver MOV P1,00000001B Motor operates in clockwise ACALL Hold off MOV P1,00000010B Motor operates in anticlockwise ACALL DELAY SJMP Major Motor rotates regularly in clockwise for some period and anticlockwise fór some timeDELAY M0V R4,FF H Load Ur4 sign up with FF M0V R3,FF L Load L3 sign up with FFL0OP1 DJNZ R3,L0OP1 Decrement R3 until it is definitely zeroL0OP2 DJNZ R4,L0OP2 Decrement Ur4 until it can be zero RET Return to the major plan 3. It isused in disk drives, populate matrix computer printers, plotters and robotics and procedure control sectors.It ismainly utilized for place control. Stepper engines possess a permanent magnet called disc (alsocalled the base) surrounded by a stator. The nearly all common stepper motors have got four statorwindings that are usually matched with a center-tap. The center tap enables a shift of present path ineach of twó coils when á turning is certainly grounded, thus ensuing in a polarity shift of thestator.Also a small stepper engine need a present of 400mA for its turn.But the ports of themicrocontroller can not supply this much amount of present.If you try to link the motordirectly tó the microcontroller,thé electric motor test to pull large present from the control and the 4. This can become attained by making use of an number of energy transistors.But right now adays we have driver circuits obtainable easily in the form of ICs.ULN2003 is one such car owner ICwhich is certainly a High-VoItage High-Current DarIington transistor selection and can give a current of500mA new.This present is adequate to drive the stepper motor.
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