Dear all, i have written a code which is as follows //whenever the microcontroller receives a input ,it should generate a voltage pulse of 5v or more at the output port which will be used actuate the relay
//the problem is once i give the input voltage of 5v the led glows, without connect the input through rs232 // kindly tell me were i am i going wrong
the program is as follows
#include <>
sbit transistor=P1^0;
void RX(void) { TMOD=0X20; TH1=-3; TR1=0xff; SCON=0X50; RI=0; }
void main() {
unsigned int i,j;
transistor=0; // transistor off u will get zero volt (0V)
RX();
while(RI==0) // checking for data from serial port {} RI=0;
transistor=1;
for(i=0;i<=1275;i++) for(j=0;j<=1275;j++); transistor=0; while(1) ;
}//main