INDEX

SR NOTITLESIGN

1Interfacing of LED, RELAY, Pushbutton

2Sending and receive data serially to and from PC

3Using a Watchdog Timer

4Design a 8 bit Binary counter

5DC Motor Control using PWM module

6 Interfacing of Temp Sensor

7Interfacing seven segment Display

8Scrolling text message on LED dot Matrix

Practical no: 1 Interfacing of LED, RELAY, PushbuttonAimWrite a Program to blink an LED using 8051

Theory We now want to flash a LED. It works by turning ON a LED & then turning it OFF & then looping back to START. Figure shows how to interface the LED to microcontroller. The Anode is connected through a resistorto Vcc & the Cathode is connected to the Microcontroller pin. So when the Port Pin isHIGH the LED is OFF& when the Port Pin isLOW the LED is turned ON.

LED Interfacing Program#include MSDelayNew(unsigned int v);void main() // Start of main() function{while(1)// Infinite loop. The program will run forever{

P1 = 0x00;MSDelayNew(50);P1 = 0X01;MSDelayNew(50);}}

MSDelayNew(unsigned int v){unsigned int x, y;

for (x=0;x