8051 Relay Interfacing

A relay is an electrically controllable switch widely used in industrial controls, automobiles, and appliances. It allows the isolation of two separate sections of a system with two different voltage sources. For example, a +5V system can be isolated from a 120V system by placing a relay between them. One such relay is called an electromechanical (or electromagnetic) relay (EMR).

Program to turns the lamp on and off by energizing and de-energizing the relay every second.

	ORG 0H
MAIN:
	SETB P1.0
	MOV R5, #55
	ACALL DELAY
	CLR P1.0
	MOV R5, #55
	ACALL DELAY
	SJMP MAIN
DELAY:
HERE1:	MOV R2, #100
HERE2:	MOV R3, #255
HERE3:	DJNZ R3, HERE3
	DJNZ R2, HERE2
	DJNZ R5, HERE1
	RET
	END

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Related topics:
8051 External Program Memory Interfacing   |   8051 External Data Memory Interfacing   |   8051 Memory Mapped IO   |   8051 LED Interfacing   |   8051 Switch Interfacing   |   8051 Keyboard Interfacing   |   8051 7-Segment Display Interfacing   |   8051 LCD Interfacing   |   8051 ADC Interfacing   |   8051 DAC Interfacing   |   8051 Sensor Interfacing   |   8051 Stepper Motor Interfacing   |   8051 DC Motor Interfacing

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List of topics: 8051

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