Design a sequence detector to detect the sequence 010 and 1001 with repetition permitted in each case.?

Question

Design a sequence detector to detect the sequence 010 and 1001 with repetition permitted in each case.?

Answer 1

hey its quit easy yar .....first draw the k-map and derive the flipflop

before going 4 that first study about the sequence counter.

sequence counter is a counter which count sequencely (i.e) one by one & to detect these  two use four flipflop(D ff) and connect the high terminal (i.e) 1 of the output of ff (i.e  0010 and 1001----> take the take the thrid output 4 1st and take first and fourth output 4 second)to an AND gate and the output  of this can be connected to the 555 timer so as to ack. the detection.

Answer 2

Clock the sequence into a shift register. AND the outputs Q1, Qbar2, Qbar3,Q4 to determine the 4 digit one. AND outputs Qbar1, Q2, Qbar3 to get the 3 digit one. If Qbar's not available on your SR, U can invert, or use other gates for similar logic.

Answer 3

What do you want to detect it on. If it is a physical quantity then easy, use a plc and write some simple code. If it is visual you get camera proxies or scanners that can pick up numbers.