please help me i am in trouble and having no time. i am using at89c51cc03 chip , i have 64 relays , i have to connect them through 8*8 matrix to mcu , i am using 5 pin relay , so please tell me the hardware description and schematics. waiting for the answers . thanx
Oh please don't go that route. Use something like the ULN2003A darlington array driver or just plain old transistors. Relays are comparatively slow, loud, power hungry and when used in that fashion may fail early. The base of each transistor should be connected to the MCU pins through a resistor, the emitters connect to ground and the collectors go one to each row or column (depending on how your 8x8 matrix is configured).