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[51] Start program from Reset Position

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DILIP371987

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Dear All,

I am using AT89S52 microcontroller to interface AC appliances. Whenever I reset the power supply all AC appliances gets turn on. I want whenever I turn on the supply they will remain turn OFF and after that I can control them according to desired signal. I am interfacing Bluetooth via serial interface (Rx,Tx).

Thanks
Dileep
 

Hi,

Please review the informations you gave.
Do you really think we can help you just by knowing this little piece of information?

--> show us the complete circuit. With power supply, reset circuit, and how you control the AC...
And there is a possiblility that the problem is caused by EMI. Then we additionally need the PCB layout.

Klaus
 

KlausST said:
Hi,

Please review the informations you gave.
Do you really think we can help you just by knowing this little piece of information?

--> show us the complete circuit. With power supply, reset circuit, and how you control the AC...
And there is a possiblility that the problem is caused by EMI. Then we additionally need the PCB layout.

Klaus
Click to expand...

I am asking about simple logic.

In every case whenever we use 8051 micro-controller by default it gives logic high at each port. So if I connect any output devices then it gives logic high. We can reset it by software reset and that logic I wanted to know in embedded C programming.

Thanks for your reply.
 

yours cannot be solved by software reset.
a logic connected to the o/p port pins of 8051 which gets enable signal after a time delay after power-on
may be suitable .

if you can recode on the software modules , see that the port ststus '0 ' is for active switching level.
 

The usual solution is to use inverted logic (active low) for 8051 outputs.
 

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