hello , i am in big problem, i am using 89s52 mcu ,please anyone can tell me how could i connect a 8*8 relay matrix to mcu

 

How many I/O pins do you have available? What are the spec's on the relays?

 

mcu has 36 i/o pins ,but i have others things also like graphical lcd , can , the mcu chip is at89c51cc03, and also i am using a 5 pin relay

 

To be more specific - do you have 16 I/O pins to dedicate to the matrix?

The number of pins on the relay is not significant. The coil voltage and current is very important.

 

To be more specific - do you have 16 I/O pins to dedicate to the matrix?

The number of pins on the relay is not significant. The coil voltage and current is very important.

yes i have 16 i/o pins to dedicate to the matrix,specification of relays are current=12 to 14mA, contact voltage =12 v dc

 

many many thanks for ur support ,alberto. hoping u would help me in future again.thank u

 

With those voltages involved, special care should be taken, not to bias the diode forward by accident.