[help urgent] problem in interfacing the 8051 with relays

[jjeevan007]

hi to all,

i need help its urgent..........

i am interfacing the at89s52 with some 2 sensors and the 8 relays.......

i am using using port 0 to operate the relays and port 1 is interfaced with sensor..........

the code is fine but the problem is sometimes it executes the full code, sometimes half code sometimes it doesnt starts executing the code........

i dont what is the problem whether its due to power problem something else.......

regards
jjeevan

 

[ragav4456]

Don't use PORT 0, TRY THIS SAME PROGRAM IN PORT 2.

Check this

 

[jjeevan007]

no it is still the same

 

[jjeevan007]

i am using a ir sensor to detect the object, but the ir sensor are getting saturated, they are giving logic 1 output always even no object is placed in front it...............

 

[Tahmid]

Which IR sensor are you using?

Many IR sensors give logic 1 output when "low" and 0 output when "high".

 

[manoj madhavan]

i am using a ir sensor to detect the object, but the ir sensor are getting saturated, they are giving logic 1 output always even no object is placed in front it...............

Can you post the schematic here?

 

[jjeevan007]

Which IR sensor are you using?

Many IR sensors give logic 1 output when "low" and 0 output when "high".

sorry for the late reply
**broken link removed**

is the ir sensor board it gives logic high output when it detects the object.......

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Can you post the schematic here?

sorry i dont have the schematic of that......

 

[ragav4456]

Check the link

**broken link removed**

 

[amayilsamy]

I think there is might be a Power problem. Check your Relay interfacing circuit. What is operating current of your relay?