Hi!

My soccer robot (the attacker) has 8 sensors, all share a interrupt (INT0). I use a AND gate (Logic OR, negative trigger).

Any of the 8 sensors requests (i.e. find the visible light ball, touched the wall, locate the goal) will trigger the INT0, after that, the 89C52 will MOV the 8 bit in P0.

My ball detecting circuit--->Schmitt Trigger--->4 input AND gate--->2 input AND gate--->89C52 P0

Above is my Circuit connection. The "AND gate" part, a little bit complicate, can you suggest me a good 8 input AND circuit (Op-amp, TTL, Diodes, CMOS...)

Below are the link about the competition:

www.robocup.org

Thanks

Stanley