NOR GATE
5V
SW_A
A
SW_B
B
GND
R
R
GND
O
O = A + B
A =
0 / L / 0V
B =
0 / L / 0V
O =
1 / H / 5V
LED :
ON
A
B
A+B
O
0
0
0
1
0
1
1
0
1
0
1
0
1
1
1
0
NOR Gate IC
* 7402 (TTL)
* 4001 (CMOS)